View source for P53

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'''Tumor protein p53''', also known as '''p53''', '''cellular [[tumor antigen]] p53''' ([[UniProt]] name), '''phosphoprotein p53''',  '''tumor suppressor p53''', '''antigen NY-CO-13''', or '''transformation-related protein 53 (TRP53)''', is any [[protein isoform|isoform]] of a protein encoded by homologous [[gene]]s in various organisms, such as ''TP53'' (humans) and ''Trp53'' (mice). This homolog (originally thought to be, and often spoken of as, a single protein) is crucial in [[multicellular organism]]s, where it prevents [[cancer]] formation, thus, functions as a [[tumor suppressor gene|tumor suppressor]].<ref name="Surget">{{cite journal | vauthors = Surget S, Khoury MP, Bourdon JC | title = Uncovering the role of p53 splice variants in human malignancy: a clinical perspective | journal = OncoTargets and Therapy | volume = 7 | pages = 57–68 | date = December 2013 | pmid = 24379683 | pmc = 3872270 | doi = 10.2147/OTT.S53876 }}</ref> As such, p53 has been described as "the guardian of the [[genome]]" because of its role in conserving stability by preventing genome mutation.<ref name="isbn0-471-33061-2">{{vcite book|author=Read, A. P.; Strachan, T.|title=Human molecular genetics 2|publisher=Wiley|location=New York|year=1999|pages=|isbn=0-471-33061-2|oclc=| doi=| chapter=Chapter 18: Cancer Genetics }}</ref> Hence ''TP53'' is classified as a [[tumor suppressor gene]].<ref name="pmid6396087">{{cite journal | vauthors = Matlashewski G, Lamb P, Pim D, Peacock J, Crawford L, Benchimol S | title = Isolation and characterization of a human p53 cDNA clone: expression of the human p53 gene | journal = The EMBO Journal | volume = 3 | issue = 13 | pages = 3257–62 | date = December 1984 | pmid = 6396087 | pmc = 557846 | doi =  }}</ref><ref name="pmid3456488">{{cite journal | vauthors = Isobe M, Emanuel BS, Givol D, Oren M, Croce CM | title = Localization of gene for human p53 tumour antigen to band 17p13 | journal = Nature | volume = 320 | issue = 6057 | pages = 84–5 | year = 1986 | pmid = 3456488 | doi = 10.1038/320084a0 }}</ref><ref name="pmid2047879">{{cite journal | vauthors = Kern SE, Kinzler KW, Bruskin A, Jarosz D, Friedman P, Prives C, Vogelstein B | title = Identification of p53 as a sequence-specific DNA-binding protein | journal = Science | volume = 252 | issue = 5013 | pages = 1708–11 | date = June 1991 | pmid = 2047879 | doi = 10.1126/science.2047879 }}</ref><ref name="pmid 3001719">{{cite journal | vauthors = McBride OW, Merry D, Givol D | title = The gene for human p53 cellular tumor antigen is located on chromosome 17 short arm (17p13) | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 83 | issue = 1 | pages = 130–4 | date = January 1986 | pmid = 3001719 | pmc = 322805 | doi = 10.1073/pnas.83.1.130 }}</ref><ref name="Bourdon" /> ([[Gene nomenclature#Vertebrate gene and protein symbol conventions|''Italics'' are used]] to denote the ''TP53'' gene name and distinguish it from the protein it encodes.)

The name '''p53''' was given in 1979 describing the apparent [[molecular mass]]; [[SDS-PAGE]] analysis indicates that it is a 53-[[kilodalton]] (kDa) protein. However, the actual mass of the full-length p53 protein (p53α) based on the sum of masses of the [[amino acid]] residues is only 43.7 kDa. This difference is due to the high number of [[proline]] residues in the protein, which slow its migration on SDS-PAGE, thus making it appear heavier than it actually is.<ref name="pmid7107651">{{cite journal | vauthors = Ziemer MA, Mason A, Carlson DM | title = Cell-free translations of proline-rich protein mRNAs | journal = The Journal of Biological Chemistry | volume = 257 | issue = 18 | pages = 11176–80 | date = September 1982 | pmid = 7107651 | doi =  | url = http://www.jbc.org/content/257/18/11176.abstract }}</ref> In addition to the full-length protein, the human ''TP53'' gene encodes at least 15 protein isoforms, ranging in size from 3.5 to 43.7 kDa. All these p53 proteins are called the '''p53 isoforms'''.<ref name="Surget" /> The TP53 gene is the most frequently mutated gene (>50%) in human cancer, indicating that the ''TP53'' gene plays a crucial role in preventing cancer formation.<ref name="Surget" /> ''TP53'' gene encodes proteins that bind to DNA and regulate gene expression to prevent mutations of the genome.<ref>{{cite book |editor-last=Levine |editor-first=Arnold Jay |editor-last2=Lane |editor-first2=David P. | name-list-format = vanc |title=The p53 family | series = Cold Spring Harbor Perspectives in Biology |date=2010|publisher=Cold Spring Harbor Laboratory Press|location=Cold Spring Harbor, N.Y.|isbn=978-0-87969-830-0}}</ref>

== Gene ==
In humans, the ''TP53'' gene is located on the short arm of [[chromosome 17 (human)|chromosome 17]] (17p13.1).<ref name="pmid6396087" /><ref name="pmid3456488" /><ref name="pmid2047879" /><ref name="pmid 3001719" /> The gene spans 20 kb, with a non-coding exon 1 and a very long first intron of 10 kb. The coding sequence contains five regions showing a high degree of conservation in vertebrates, predominantly in exons 2, 5, 6, 7 and 8, but the sequences found in invertebrates show only distant resemblance to mammalian TP53.<ref name="pmid10618702">{{cite journal | vauthors = May P, May E | title = Twenty years of p53 research: structural and functional aspects of the p53 protein | journal = Oncogene | volume = 18 | issue = 53 | pages = 7621–36 | date = December 1999 | pmid = 10618702 | doi = 10.1038/sj.onc.1203285 }}</ref> ''TP53'' [[orthologs]]<ref name="OrthoMaM">{{vcite web | title = OrthoMaM phylogenetic marker: TP53 coding sequence | url = http://www.orthomam.univ-montp2.fr/orthomam/data/cds/detailMarkers/ENSG00000141510_TP53.xml }}</ref> have been identified in most [[mammals]] for which complete genome data are available.

In humans, a common [[polymorphism (biology)|polymorphism]] involves the substitution of an [[arginine]] for a [[proline]] at [[codon]] position 72. Many studies have investigated a genetic link between this variation and cancer susceptibility; however, the results have been controversial. For instance, a meta-analysis from 2009 failed to show a link for cervical cancer.<ref name="pmid19625214">{{cite journal | vauthors = Klug SJ, Ressing M, Koenig J, Abba MC, Agorastos T, Brenna SM, Ciotti M, Das BR, Del Mistro A, Dybikowska A, Giuliano AR, Gudleviciene Z, Gyllensten U, Haws AL, Helland A, Herrington CS, Hildesheim A, Humbey O, Jee SH, Kim JW, Madeleine MM, Menczer J, Ngan HY, Nishikawa A, Niwa Y, Pegoraro R, Pillai MR, Ranzani G, Rezza G, Rosenthal AN, Roychoudhury S, Saranath D, Schmitt VM, Sengupta S, Settheetham-Ishida W, Shirasawa H, Snijders PJ, Stoler MH, Suárez-Rincón AE, Szarka K, Tachezy R, Ueda M, van der Zee AG, von Knebel Doeberitz M, Wu MT, Yamashita T, Zehbe I, Blettner M | display-authors = 6 | title = TP53 codon 72 polymorphism and cervical cancer: a pooled analysis of individual data from 49 studies | journal = The Lancet. Oncology | volume = 10 | issue = 8 | pages = 772–84 | date = August 2009 | pmid = 19625214 | doi = 10.1016/S1470-2045(09)70187-1 }}</ref> A 2011 study found that the ''TP53'' proline mutation did have a profound effect on pancreatic cancer risk among males.<ref name="pmid21468597">{{cite journal | vauthors = Sonoyama T, Sakai A, Mita Y, Yasuda Y, Kawamoto H, Yagi T, Yoshioka M, Mimura T, Nakachi K, Ouchida M, Yamamoto K, Shimizu K | title = TP53 codon 72 polymorphism is associated with pancreatic cancer risk in males, smokers and drinkers | journal = Molecular Medicine Reports | volume = 4 | issue = 3 | pages = 489–95 | year = 2011 | pmid = 21468597 | doi = 10.3892/mmr.2011.449 }}</ref> A study of Arab women found that proline homozygosity at ''TP53'' codon 72 is associated with a decreased risk for breast cancer.<ref name="pmid20443084">{{cite journal | vauthors = Alawadi S, Ghabreau L, Alsaleh M, Abdulaziz Z, Rafeek M, Akil N, Alkhalaf M | title = P53 gene polymorphisms and breast cancer risk in Arab women | journal = Medical Oncology | volume = 28 | issue = 3 | pages = 709–15 | date = September 2011 | pmid = 20443084 | doi = 10.1007/s12032-010-9505-4 }}</ref> One study suggested that ''TP53'' codon 72 polymorphisms, [[MDM2 SNP309]], and [[A2164G]] may collectively be associated with non-oropharyngeal cancer susceptibility and that MDM2 SNP309 in combination with ''TP53'' codon 72 may accelerate the development of non-oropharyngeal cancer in women.<ref name="pmid21656578">{{cite journal | vauthors = Yu H, Huang YJ, Liu Z, Wang LE, Li G, Sturgis EM, Johnson DG, Wei Q | title = Effects of MDM2 promoter polymorphisms and p53 codon 72 polymorphism on risk and age at onset of squamous cell carcinoma of the head and neck | journal = Molecular Carcinogenesis | volume = 50 | issue = 9 | pages = 697–706 | date = September 2011 | pmid = 21656578 | pmc = 3142329 | doi = 10.1002/mc.20806 }}</ref> A 2011 study found that ''TP53'' codon 72 polymorphism was associated with an increased risk of lung cancer.<ref name="pmid21316118">{{cite journal | vauthors = Piao JM, Kim HN, Song HR, Kweon SS, Choi JS, Yun WJ, Kim YC, Oh IJ, Kim KS, Shin MH | title = p53 codon 72 polymorphism and the risk of lung cancer in a Korean population | journal = Lung Cancer | volume = 73 | issue = 3 | pages = 264–7 | date = September 2011 | pmid = 21316118 | doi = 10.1016/j.lungcan.2010.12.017 }}</ref>

Meta-analyses from 2011 found no significant associations between ''TP53'' codon 72 polymorphisms and both colorectal cancer risk<ref name="pmid21140221">{{cite journal | vauthors = Wang JJ, Zheng Y, Sun L, Wang L, Yu PB, Dong JH, Zhang L, Xu J, Shi W, Ren YC | title = TP53 codon 72 polymorphism and colorectal cancer susceptibility: a meta-analysis | journal = Molecular Biology Reports | volume = 38 | issue = 8 | pages = 4847–53 | date = November 2011 | pmid = 21140221 | doi = 10.1007/s11033-010-0619-8 }}</ref> and endometrial cancer risk.<ref name="pmid20552298">{{cite journal | vauthors = Jiang DK, Yao L, Ren WH, Wang WZ, Peng B, Yu L | title = TP53 Arg72Pro polymorphism and endometrial cancer risk: a meta-analysis | journal = Medical Oncology | volume = 28 | issue = 4 | pages = 1129–35 | date = December 2011 | pmid = 20552298 | doi = 10.1007/s12032-010-9597-x }}</ref> A 2011 study of a Brazilian birth cohort found an association between the non mutant arginine ''TP53'' and individuals without a family history of cancer.<ref name="pmid22116280">{{cite journal | vauthors = Thurow HS, Haack R, Hartwig FP, Oliveira IO, Dellagostin OA, Gigante DP, Horta BL, Collares T, Seixas FK | title = TP53 gene polymorphism: importance to cancer, ethnicity and birth weight in a Brazilian cohort | journal = Journal of Biosciences | volume = 36 | issue = 5 | pages = 823–31 | date = December 2011 | pmid = 22116280 | doi = 10.1007/s12038-011-9147-5 }}</ref> Another 2011 study found that the p53 homozygous (Pro/Pro) genotype was associated with a significantly increased risk for renal cell carcinoma.<ref name="pmid21982800">{{cite journal | vauthors = Huang CY, Su CT, Chu JS, Huang SP, Pu YS, Yang HY, Chung CJ, Wu CC, Hsueh YM | title = The polymorphisms of P53 codon 72 and MDM2 SNP309 and renal cell carcinoma risk in a low arsenic exposure area | journal = Toxicology and Applied Pharmacology | volume = 257 | issue = 3 | pages = 349–55 | date = December 2011 | pmid = 21982800 | doi = 10.1016/j.taap.2011.09.018 }}</ref>

== Structure ==
[[File:P53 Schematic.tif|thumb|right|A schematic of the known protein domains in p53. (NLS = Nuclear Localization Signal).|360x360px]]
[[File:3KMD p53 DNABindingDomian.png|thumb|Crystal structure of four p53 DNA binding domains (as found in the bioactive homo-tetramer) and has seven [[domain (protein)|domains]]:]]
# an acidic [[N-terminus]] transcription-activation domain (TAD), also known as activation domain 1 (AD1), which activates [[transcription factor]]s. The N-terminus contains two complementary transcriptional activation domains, with a major one at residues 1–42 and a minor one at residues 55–75, specifically involved in the regulation of several pro-apoptotic genes.<ref name="pmid9707426">{{cite journal | vauthors = Venot C, Maratrat M, Dureuil C, Conseiller E, Bracco L, Debussche L | title = The requirement for the p53 proline-rich functional domain for mediation of apoptosis is correlated with specific PIG3 gene transactivation and with transcriptional repression | journal = The EMBO Journal | volume = 17 | issue = 16 | pages = 4668–79 | date = August 1998 | pmid = 9707426 | pmc = 1170796 | doi = 10.1093/emboj/17.16.4668 }}</ref>
# activation domain 2 (AD2) important for [[Apoptosis|apoptotic]] activity: residues 43-63.
# [[proline]] rich domain important for the apoptotic activity of p53 by nuclear exportation via [[MAPK]]: residues 64-92.
# central [[DNA]]-binding core domain ([[DNA-binding domain|DBD]]). Contains one zinc atom and several [[arginine]] amino acids: residues 102-292. This region is responsible for binding the p53 co-repressor [[LMO3]].<ref name="Larsen S, Yokochi T, Isogai E, Nakamura Y, Ozaki T, Nakagawara A 2010 252–7">{{cite journal | vauthors = Larsen S, Yokochi T, Isogai E, Nakamura Y, Ozaki T, Nakagawara A | title = LMO3 interacts with p53 and inhibits its transcriptional activity | journal = Biochemical and Biophysical Research Communications | volume = 392 | issue = 3 | pages = 252–7 | date = February 2010 | pmid = 19995558 | doi = 10.1016/j.bbrc.2009.12.010 }}</ref>
# [[Nuclear localization sequence|Nuclear Localization Signaling]] (NLS) domain, residues 316-325.
# homo-oligomerisation domain (OD): residues 307-355. Tetramerization is essential for the activity of p53 ''in vivo''.
# [[C-terminal]] involved in downregulation of DNA binding of the central domain: residues 356-393.<ref name="pmid15713654">{{cite journal | vauthors = Harms KL, Chen X | title = The C terminus of p53 family proteins is a cell fate determinant | journal = Molecular and Cellular Biology | volume = 25 | issue = 5 | pages = 2014–30 | date = March 2005 | pmid = 15713654 | pmc = 549381 | doi = 10.1128/MCB.25.5.2014-2030.2005 }}</ref>
A tandem of nine-amino-acid transactivation domains (9aaTAD) was identified in the AD1 and AD2 regions of transcription factor p53.<ref name="pmid17467953">{{cite journal | vauthors = Piskacek S, Gregor M, Nemethova M, Grabner M, Kovarik P, Piskacek M | title = Nine-amino-acid transactivation domain: establishment and prediction utilities | journal = Genomics | volume = 89 | issue = 6 | pages = 756–68 | date = June 2007 | pmid = 17467953 | doi = 10.1016/j.ygeno.2007.02.003 }}</ref>
[[Gene knockout|KO mutations]] and position for p53 interaction with [[Transcription factor II D|TFIID]] are listed below:<ref name="p53_domains">{{cite journal | vauthors = Uesugi M, Nyanguile O, Lu H, Levine AJ, Verdine GL | title = Induced alpha helix in the VP16 activation domain upon binding to a human TAF | journal = Science | volume = 277 | issue = 5330 | pages = 1310–3 | date = August 1997 | pmid = 9271577 | doi = 10.1126/science.277.5330.1310 }};
{{cite journal | vauthors = Uesugi M, Verdine GL | title = The alpha-helical FXXPhiPhi motif in p53: TAF interaction and discrimination by MDM2 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 96 | issue = 26 | pages = 14801–6 | date = December 1999 | pmid = 10611293 | pmc = 24728 | doi = 10.1073/pnas.96.26.14801 }};
{{cite journal | vauthors = Choi Y, Asada S, Uesugi M | title = Divergent hTAFII31-binding motifs hidden in activation domains | journal = The Journal of Biological Chemistry | volume = 275 | issue = 21 | pages = 15912–6 | date = May 2000 | pmid = 10821850 | doi = 10.1074/jbc.275.21.15912 }};
{{cite journal | vauthors = Venot C, Maratrat M, Sierra V, Conseiller E, Debussche L | title = Definition of a p53 transactivation function-deficient mutant and characterization of two independent p53 transactivation subdomains | journal = Oncogene | volume = 18 | issue = 14 | pages = 2405–10 | date = April 1999 | pmid = 10327062 | doi = 10.1038/sj.onc.1202539 }};
{{cite journal | vauthors = Lin J, Chen J, Elenbaas B, Levine AJ | title = Several hydrophobic amino acids in the p53 amino-terminal domain are required for transcriptional activation, binding to mdm-2 and the adenovirus 5 E1B 55-kD protein | journal = Genes & Development | volume = 8 | issue = 10 | pages = 1235–46 | date = May 1994 | pmid = 7926727 | doi = 10.1101/gad.8.10.1235 }}</ref> The competence of the p53 transactivation domains 9aaTAD to activate transcription as small peptides was reported.<ref name="dx.doi.org">{{cite journal | vauthors = Piskacek M, Havelka M, Rezacova M, Knight A | title = The 9aaTAD Transactivation Domains: From Gal4 to p53 | journal = PLOS One | volume = 11 | issue = 9 | pages = e0162842 | pmid = 27618436 | pmc = 5019370 | doi = 10.1371/journal.pone.0162842 }}</ref>

[[File:Piskacek p53b.jpg|600px]]
[[File:Piskacek p53 transactivation.tif|600px|p53 transactivation {{cite journal | vauthors = Piskacek M, Havelka M, Rezacova M, Knight A | title = The 9aaTAD Transactivation Domains: From Gal4 to p53 | journal = PLOS One | volume = 11 | issue = 9 | pages = e0162842 | pmid = 27618436 | pmc = 5019370 | doi = 10.1371/journal.pone.0162842 }}]]

9aaTADs mediate p53 interaction with general coactivators – TAF9, CBP/p300 (all four domains KIX, TAZ1, TAZ2 and IBiD), GCN5 and PC4, regulatory protein MDM2 and replication protein A (RPA).<ref name="pmid17467953"/>
[[File:Piskacek p53a.jpg|600px]]
[[File:Piskacek p53 conversion.tif|300px|p53 conversion {{cite journal | vauthors = Piskacek M, Havelka M, Rezacova M, Knight A | title = The 9aaTAD Transactivation Domains: From Gal4 to p53 | journal = PLOS One | volume = 11 | issue = 9 | pages = e0162842 | pmid = 27618436 | pmc = 5019370 | doi = 10.1371/journal.pone.0162842 }}]]

Mutations that deactivate p53 in cancer usually occur in the DBD. Most of these mutations destroy the ability of the protein to bind to its target DNA sequences, and thus prevents transcriptional activation of these genes. As such, mutations in the DBD are [[recessive allele|recessive]] [[loss-of-function]] mutations. Molecules of p53 with mutations in the OD dimerise with [[wild-type]] p53, and prevent them from activating transcription. Therefore, OD mutations have a dominant negative effect on the function of p53.

Wild-type p53 is a [[labile]] [[protein]], comprising folded and [[Intrinsically unstructured proteins|unstructured regions]] that function in a synergistic manner.<ref name="pmid12367518">{{cite journal | vauthors = Bell S, Klein C, Müller L, Hansen S, Buchner J | title = p53 contains large unstructured regions in its native state | journal = Journal of Molecular Biology | volume = 322 | issue = 5 | pages = 917–27 | date = October 2002 | pmid = 12367518 | doi = 10.1016/S0022-2836(02)00848-3 }}</ref>

== Function ==
p53 has many mechanisms of anticancer function and plays a role in apoptosis, genomic stability, and inhibition of [[angiogenesis]]. In its anti-cancer role, p53 works through several mechanisms:
* It can activate [[DNA repair]] proteins when DNA has sustained damage. Thus, it may be an important factor in [[aging]].<ref>{{cite book|last=Gilbert|first=Scott F.|title=Developmental Biology, 10th ed.|publisher=Sinauer Associates, Inc. Publishers|location=Sunderland, MA USA|pages=588}}</ref>
* It can arrest growth by holding the [[cell cycle]] at the [[G1/S transition|G1/S regulation point]] on DNA damage recognition (if it holds the cell here for long enough, the DNA repair proteins will have time to fix the damage and the cell will be allowed to continue the cell cycle).
* It can initiate [[apoptosis]] (i.e., programmed cell death) if DNA damage proves to be irreparable.
* It is essential for the senescence response to short [[telomere]]s.

[[File:P53 pathways.jpg|300px|right|thumb|'''p53 pathway''': In a normal cell, p53 is inactivated by its negative regulator, mdm2. Upon DNA damage or other stresses, various pathways will lead to the dissociation of the p53 and mdm2 complex. Once activated, p53 will induce a cell cycle arrest to allow either repair and survival of the cell or apoptosis to discard the damaged cell. How p53 makes this choice is currently unknown.]]

Activated p53 binds DNA and activates expression of several genes including microRNA miR-34a <ref>{{cite journal|pmid=30111844}}</ref>, WAF1/CIP1 encoding for [[p21]] and hundreds of other down-stream genes. p21 (WAF1) binds to the [[G1 phase|G1]]-[[S phase|S]]/[[Cyclin-dependent kinase|CDK]] ([[CDK4]]/[[CDK6]], [[CDK2]], and [[CDK1]]) complexes (molecules important for the [[G1/S transition]] in the cell cycle) inhibiting their activity.

When p21(WAF1) is complexed with CDK2, the cell cannot continue to the next stage of cell division. A mutant p53 will no longer bind DNA in an effective way, and, as a consequence, the p21 protein will not be available to act as the "stop signal" for cell division.<ref name="urlThe p53 tumor suppressor protein">{{vcite web|url=https://www.ncbi.nlm.nih.gov/books/bv.fcgi?call=bv.View..ShowSection&rid=gnd.section.107|title=The p53 tumor suppressor protein|author=National Center for Biotechnology Information| work=Genes and Disease|publisher=United States National Institutes of Health|pages=| language=| quote=| access-date=2008-05-28}}</ref> Studies of human embryonic stem cells (hESCs) commonly describe the nonfunctional p53-p21 axis of the G1/S checkpoint pathway with subsequent relevance for cell cycle regulation and the DNA damage response (DDR). Importantly, p21 mRNA is clearly present and upregulated after the DDR in hESCs, but p21 protein is not detectable. In this cell type, p53 activates numerous microRNAs (like miR-302a, miR-302b, miR-302c, and miR-302d) that directly inhibit the p21 expression in hESCs.

Research has also linked the p53 and [[Retinoblastoma protein|RB1]] pathways, via p14ARF, raising the possibility that the pathways may regulate each other.<ref name="pmid9744267">{{cite journal | vauthors = Bates S, Phillips AC, Clark PA, Stott F, Peters G, Ludwig RL, Vousden KH | title = p14ARF links the tumour suppressors RB and p53 | journal = Nature | volume = 395 | issue = 6698 | pages = 124–5 | date = September 1998 | pmid = 9744267 | doi = 10.1038/25867 }}</ref>

p53 by regulating [[leukemia inhibitory factor|LIF]] has been shown to facilitate [[Implantation (human embryo)|implantation]] in the mouse model and possibly in humans.<ref name="pmid18046411">{{cite journal | vauthors = Hu W, Feng Z, Teresky AK, Levine AJ | title = p53 regulates maternal reproduction through LIF | journal = Nature | volume = 450 | issue = 7170 | pages = 721–4 | date = November 2007 | pmid = 18046411 | doi = 10.1038/nature05993 }}</ref>

p53 expression can be stimulated by UV light, which also causes DNA damage. In this case, p53 can initiate events leading to [[sun tanning|tanning]].<ref>{{vcite news|title=Genome's guardian gets a tan started|url=https://www.newscientist.com/channel/health/mg19325955.800-genomes-guardian-gets-a-tan-started.html|publisher=New Scientist|date=March 17, 2007|access-date=2007-03-29}}</ref><ref name="pmid17350573">{{cite journal | vauthors = Cui R, Widlund HR, Feige E, Lin JY, Wilensky DL, Igras VE, D'Orazio J, Fung CY, Schanbacher CF, Granter SR, Fisher DE | title = Central role of p53 in the suntan response and pathologic hyperpigmentation | journal = Cell | volume = 128 | issue = 5 | pages = 853–64 | date = March 2007 | pmid = 17350573 | doi = 10.1016/j.cell.2006.12.045 }}</ref>

The p21 protein binds directly to cyclin-CDK complexes that drive forward the cell cycle and inhibits their kinase activity thereby causing cell cycle arrest to allow repair to take place. p21 can also mediate growth arrest associated with differentiation and a more permanent growth arrest associated with cellular senescence. The p21 gene contains several p53 response elements that mediate direct binding of the p53 protein, resulting in transcriptional activation of the gene encoding the p21 protein.

===Stem cells=== 
Levels of p53 play an important role in the maintenance of stem cells throughout development and the rest of human life.

====Embryonic stem cells====
p53 is maintained at low inactive levels in human [[embryonic stem cell]]s (hESCs).<ref name="Jain AK p53">{{cite journal | vauthors = Jain AK, Allton K, Iacovino M, Mahen E, Milczarek RJ, Zwaka TP, Kyba M, Barton MC | title = p53 regulates cell cycle and microRNAs to promote differentiation of human embryonic stem cells | journal = PLoS Biology | volume = 10 | issue = 2 | pages = e1001268 | pmid = 22389628 | pmc = 3289600 | doi = 10.1371/journal.pbio.1001268 }}</ref> This is because activation of p53 leads to rapid differentiation of hESCs.<ref>{{cite journal | vauthors = Maimets T, Neganova I, Armstrong L, Lako M | title = Activation of p53 by nutlin leads to rapid differentiation of human embryonic stem cells | journal = Oncogene | volume = 27 | issue = 40 | pages = 5277–87 | date = September 2008 | pmid = 18521083 | doi = 10.1038/onc.2008.166 }}</ref> Studies have shown that knocking out p53 delays differentiation and that adding p53 causes spontaneous differentiation, showing how p53 promotes differentiation of hESCs and plays a key role in cell cycle as a differentiation regulator. When p53 becomes stabilized and activated in hESCs, it increases p21 to establish a longer G1. This typically leads to abolition of S-phase entry, which stops the cell cycle in G1, leading to differentiation. p53 also activates [[miR-34a]] and [[miR-145]], which then repress the hESCs pluripotency factors, further instigating differentiation.<ref name="Jain AK p53"/>

====Adult stem cells====
In adult stem cells, p53 regulation is important for maintenance of stemness in [[adult stem cell niche]]s. Mechanical signals such as [[hypoxia (medical)|hypoxia]] affect levels of p53 in these niche cells through the [[hypoxia inducible factors]], [[HIF-1α]] and HIF-2α. While HIF-1α stabilizes p53, HIF-2α suppresses it.<ref>{{cite journal | vauthors = Das B, Bayat-Mokhtari R, Tsui M, Lotfi S, Tsuchida R, Felsher DW, Yeger H | title = HIF-2α suppresses p53 to enhance the stemness and regenerative potential of human embryonic stem cells | journal = Stem Cells | volume = 30 | issue = 8 | pages = 1685–95 | date = August 2012 | pmid = 22689594 | pmc = 3584519 | doi = 10.1002/stem.1142 }}</ref> Suppression of p53 plays important roles in cancer stem cell phenotype, induced pluripotent stem cells and other stem cell roles and behaviors, such as blastema formation. Cells with decreased levels of p53 have been shown to reprogram into stem cells with a much greater efficiency than normal cells.<ref>{{cite journal | vauthors = Lake BB, Fink J, Klemetsaune L, Fu X, Jeffers JR, Zambetti GP, Xu Y | title = Context-dependent enhancement of induced pluripotent stem cell reprogramming by silencing Puma | journal = Stem Cells | volume = 30 | issue = 5 | pages = 888–97 | date = May 2012 | pmid = 22311782 | pmc = 3531606 | doi = 10.1002/stem.1054 }}</ref><ref>{{cite journal | vauthors = Marión RM, Strati K, Li H, Murga M, Blanco R, Ortega S, Fernandez-Capetillo O, Serrano M, Blasco MA | title = A p53-mediated DNA damage response limits reprogramming to ensure iPS cell genomic integrity | journal = Nature | volume = 460 | issue = 7259 | pages = 1149–53 | date = August 2009 | pmid = 19668189 | pmc = 3624089 | doi = 10.1038/nature08287 }}</ref> Papers suggest that the lack of cell cycle arrest and apoptosis gives more cells the chance to be reprogrammed. Decreased levels of p53 were also shown to be a crucial aspect of [[blastema]] formation in the legs of salamanders.<ref>{{cite journal | vauthors = Yun MH, Gates PB, Brockes JP | title = Regulation of p53 is critical for vertebrate limb regeneration | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 110 | issue = 43 | pages = 17392–7 | date = October 2013 | pmid = 24101460 | pmc = 3808590 | doi = 10.1073/pnas.1310519110 }}</ref> p53 regulation is very important in acting as a barrier between stem cells and a differentiated stem cell state, as well as a barrier between stem cells being functional and being cancerous.<ref>{{cite journal | vauthors = Aloni-Grinstein R, Shetzer Y, Kaufman T, Rotter V | title = p53: the barrier to cancer stem cell formation | journal = FEBS Letters | volume = 588 | issue = 16 | pages = 2580–9 | date = August 2014 | pmid = 24560790 | doi = 10.1016/j.febslet.2014.02.011 }}</ref>

== Regulation ==
p53 becomes activated in response to myriad stressors, including but not limited to [[DNA damage]] (induced by either [[Ultraviolet|UV]], [[Ionizing radiation|IR]], or chemical agents such as hydrogen peroxide), [[oxidative stress]],<ref name="pmid18445702">{{cite journal | vauthors = Han ES, Muller FL, Pérez VI, Qi W, Liang H, Xi L, Fu C, Doyle E, Hickey M, Cornell J, Epstein CJ, Roberts LJ, Van Remmen H, Richardson A | title = The in vivo gene expression signature of oxidative stress | journal = Physiological Genomics | volume = 34 | issue = 1 | pages = 112–26 | date = June 2008 | pmid = 18445702 | pmc = 2532791 | doi = 10.1152/physiolgenomics.00239.2007 }}</ref> [[osmotic shock]], ribonucleotide depletion, and deregulated oncogene expression. This activation is marked by two major events. First, the half-life of the p53 protein is increased drastically, leading to a quick accumulation of p53 in stressed cells. Second, a [[conformational change]] forces p53 to be activated as a [[Transcriptional regulation|transcription regulator]] in these cells. The critical event leading to the activation of p53 is the phosphorylation of its N-terminal domain. The N-terminal transcriptional activation domain contains a large number of phosphorylation sites and can be considered as the primary target for protein kinases transducing stress signals.

The [[protein kinases]] that are known to target this transcriptional activation domain of p53 can be roughly divided into two groups. A first group of protein kinases belongs to the [[MAPK]] family (JNK1-3, ERK1-2, p38 MAPK), which is known to respond to several types of stress, such as membrane damage, oxidative stress, osmotic shock, heat shock, etc. A second group of protein kinases ([[Ataxia telangiectasia and Rad3 related|ATR]], [[Ataxia telangiectasia mutated|ATM]], [[Chk1|CHK1]] and [[Chk2|CHK2]], [[DNA-PKcs|DNA-PK]], CAK, [[TP53RK]]) is implicated in the genome integrity checkpoint, a molecular cascade that detects and responds to several forms of DNA damage caused by genotoxic stress. Oncogenes also stimulate p53 activation, mediated by the protein [[p14ARF]].

In unstressed cells, p53 levels are kept low through a continuous degradation of p53. A protein called [[Mdm2]] (also called HDM2 in humans), binds to p53, preventing its action and transports it from the [[Cell nucleus|nucleus]] to the [[cytosol]]. Also Mdm2 acts as [[ubiquitin ligase]] and covalently attaches [[ubiquitin]] to p53 and thus marks p53 for degradation by the [[proteasome]]. However, ubiquitylation of p53 is reversible.

MI-63 binds to MDM2 making the action of p53 again possible in situations were p53's function has become inhibited.<ref>{{cite journal | vauthors = Canner JA, Sobo M, Ball S, Hutzen B, DeAngelis S, Willis W, Studebaker AW, Ding K, Wang S, Yang D, Lin J | title = MI-63: a novel small-molecule inhibitor targets MDM2 and induces apoptosis in embryonal and alveolar rhabdomyosarcoma cells with wild-type p53 | journal = British Journal of Cancer | volume = 101 | issue = 5 | pages = 774–81 | date = September 2009 | pmid = 19707204 | pmc = 2736841 | doi = 10.1038/sj.bjc.6605199 }}</ref>

A ubiquitin specific protease, [[USP7]] (or [[USP7|HAUSP]]), can cleave ubiquitin off p53, thereby protecting it from proteasome-dependent  degradation via the [[Ubiquitination|ubiquitin ligase pathway]]. This is one means by which p53 is stabilized in response to oncogenic insults. [[USP42]] has also been shown to deubiquitinate p53 and may be required for the ability of p53 to respond to stress.<ref>{{cite journal | vauthors = Hock AK, Vigneron AM, Carter S, Ludwig RL, Vousden KH | title = Regulation of p53 stability and function by the deubiquitinating enzyme USP42 | journal = The EMBO Journal | volume = 30 | issue = 24 | pages = 4921–30 | date = November 2011 | pmid = 22085928 | pmc = 3243628 | doi = 10.1038/emboj.2011.419 }}</ref>

Recent research has shown that HAUSP is mainly localized in the nucleus, though a fraction of it can be found in the cytoplasm and mitochondria. Overexpression of HAUSP results in p53 stabilization. However, depletion of HAUSP does not result to a decrease in p53 levels but rather increases p53 levels due to the fact that HAUSP binds and deubiquitinates Mdm2. It has been shown that HAUSP is a better binding partner to Mdm2 than p53 in unstressed cells.

USP10 however has been shown to be located in the cytoplasm in unstressed cells and deubiquitinates cytoplasmic p53, reversing Mdm2 ubiquitination. Following DNA damage, USP10 translocates to the nucleus and contributes to p53 stability. Also USP10 does not interact with Mdm2.<ref name="pmid20096447">{{cite journal | vauthors = Yuan J, Luo K, Zhang L, Cheville JC, Lou Z | title = USP10 regulates p53 localization and stability by deubiquitinating p53 | journal = Cell | volume = 140 | issue = 3 | pages = 384–96 | date = February 2010 | pmid = 20096447 | pmc = 2820153 | doi = 10.1016/j.cell.2009.12.032 }}</ref>

Phosphorylation of the N-terminal end of p53 by the above-mentioned protein kinases disrupts Mdm2-binding. Other proteins, such as Pin1, are then recruited to p53 and induce a conformational change in p53, which prevents Mdm2-binding even more. Phosphorylation also allows for binding of transcriptional coactivators, like [[EP300|p300]] and [[PCAF]], which then acetylate the carboxy-terminal end of p53, exposing the DNA binding domain of p53, allowing it to activate or repress specific genes. Deacetylase enzymes, such as [[Sirt1]] and [[Sirt7]], can deacetylate p53, leading to an inhibition of apoptosis.<ref name="pmid18239138">{{cite journal | vauthors = Vakhrusheva O, Smolka C, Gajawada P, Kostin S, Boettger T, Kubin T, Braun T, Bober E | title = Sirt7 increases stress resistance of cardiomyocytes and prevents apoptosis and inflammatory cardiomyopathy in mice | journal = Circulation Research | volume = 102 | issue = 6 | pages = 703–10 | date = March 2008 | pmid = 18239138 | doi = 10.1161/CIRCRESAHA.107.164558 }}</ref> Some oncogenes can also stimulate the transcription of proteins that bind to MDM2 and inhibit its activity.

== Role in disease ==
[[File:Signal transduction pathways.svg|300px|thumb|right|Overview of signal transduction pathways involved in [[apoptosis]].]]
[[File:Anaplastic astrocytoma - p53 - very high mag.jpg|thumb|A [[micrograph]] showing cells with abnormal p53 expression (brown) in a brain tumor. [[immunostain|p53 immunostain]].]]
If the ''TP53'' gene is damaged, tumor suppression is severely compromised. People who inherit only one functional copy of the ''TP53'' gene will most likely develop tumors in early adulthood, a disorder known as [[Li-Fraumeni syndrome]].

The ''TP53'' gene can also be modified by [[mutagen]]s ([[chemical substance|chemicals]], [[radiation]], or [[virus]]es), increasing the likelihood for uncontrolled cell division. More than 50 percent of human [[tumor]]s contain a [[mutation]] or [[genetic deletion|deletion]] of the ''TP53'' gene.<ref name="pmid1905840">{{cite journal | vauthors = Hollstein M, Sidransky D, Vogelstein B, Harris CC | title = p53 mutations in human cancers | journal = Science | volume = 253 | issue = 5015 | pages = 49–53 | date = July 1991 | pmid = 1905840 | doi = 10.1126/science.1905840 }}</ref> Loss of p53 creates genomic instability that most often results in an [[aneuploidy]] phenotype.<ref>{{cite journal | vauthors = Schmitt CA, Fridman JS, Yang M, Baranov E, Hoffman RM, Lowe SW | title = Dissecting p53 tumor suppressor functions in vivo | journal = Cancer Cell | volume = 1 | issue = 3 | pages = 289–98 | date = April 2002 | pmid = 12086865 | doi = 10.1016/S1535-6108(02)00047-8 }}</ref>

Increasing the amount of p53 may seem a solution for treatment of tumors or prevention of their spreading. This, however, is not a usable method of treatment, since it can cause premature aging.<ref name="pmid11780111">{{cite journal | vauthors = Tyner SD, Venkatachalam S, Choi J, Jones S, Ghebranious N, Igelmann H, Lu X, Soron G, Cooper B, Brayton C, Park SH, Thompson T, Karsenty G, Bradley A, Donehower LA | title = p53 mutant mice that display early ageing-associated phenotypes | journal = Nature | volume = 415 | issue = 6867 | pages = 45–53 | date = January 2002 | pmid = 11780111 | doi = 10.1038/415045a }}</ref> Restoring [[endogenous]] normal p53 function holds some promise. Research has shown that this restoration can lead to regression of certain cancer cells without damaging other cells in the process. The ways by which tumor regression occurs depends mainly on the tumor type. For example, restoration of endogenous p53 function in lymphomas may induce [[apoptosis]], while cell growth may be reduced to normal levels. Thus, pharmacological reactivation of p53 presents itself as a viable cancer treatment option.<ref name="pmid17251932">{{cite journal | vauthors = Ventura A, Kirsch DG, McLaughlin ME, Tuveson DA, Grimm J, Lintault L, Newman J, Reczek EE, Weissleder R, Jacks T | title = Restoration of p53 function leads to tumour regression in vivo | journal = Nature | volume = 445 | issue = 7128 | pages = 661–5 | date = February 2007 | pmid = 17251932 | doi = 10.1038/nature05541 }}</ref><ref name="pmid24154492">{{cite journal | vauthors = Herce HD, Deng W, Helma J, Leonhardt H, Cardoso MC | title = Visualization and targeted disruption of protein interactions in living cells | journal = Nature Communications | volume = 4 | issue =  | pages = 2660 | year = 2013 | pmid = 24154492 | pmc = 3826628 | doi = 10.1038/ncomms3660 }}</ref> The first commercial gene therapy, [[Gendicine]], was approved in China in 2003 for the treatment of [[head and neck cancer|head and neck squamous cell carcinoma]]. It delivers a functional copy of the p53 gene using an engineered [[adenovirus]].<ref name=Gend>{{cite journal | vauthors = Pearson S, Jia H, Kandachi K | title = China approves first gene therapy | journal = Nature Biotechnology | volume = 22 | issue = 1 | pages = 3–4 | date = January 2004 | pmid = 14704685 | doi = 10.1038/nbt0104-3 | url = http://www.nature.com/nbt/journal/v22/n1/full/nbt0104-3.html | number =  }}</ref>

Certain pathogens can also affect the p53 protein that the ''TP53'' gene expresses. One such example, [[human papillomavirus]] (HPV), encodes a protein, E6, which binds to the p53 protein and inactivates it. This mechanism, in synergy with the inactivation of the cell cycle regulator [[pRb]] by the HPV protein E7, allows for repeated cell division manifested clinically as [[wart]]s. Certain HPV types, in particular types 16 and 18, can also lead to progression from a benign wart to low or high-grade [[cervical dysplasia]], which are reversible forms of precancerous lesions. Persistent infection of the [[cervix]] over the years can cause irreversible changes leading to [[carcinoma in situ]] and eventually invasive cervical cancer. This results from the effects of HPV genes, particularly those encoding E6 and E7, which are the two viral oncoproteins that are preferentially retained and expressed in cervical cancers by integration of the viral DNA into the host genome.<ref name="pmid18086422">{{cite journal | vauthors = Angeletti PC, Zhang L, Wood C | title = The viral etiology of AIDS-associated malignancies | journal = Advances in Pharmacology | volume = 56 | issue =  | pages = 509–57 | year = 2008 | pmid = 18086422 | pmc = 2149907 | doi = 10.1016/S1054-3589(07)56016-3 }}</ref>

The p53 protein is continually produced and degraded in cells of healthy people, resulting in [[damping|damped oscillation]]. The degradation of the p53 protein is associated with binding of MDM2. In a negative feedback loop, MDM2 itself is induced by the p53 protein. Mutant p53 proteins often fail to induce MDM2, causing p53 to accumulate at very high levels. Moreover, the mutant p53 protein itself can inhibit normal p53 protein levels. In some cases, single missense mutations in p53 have been shown to disrupt p53 stability and function.<ref name="Bullock_1997">{{cite journal | vauthors = Bullock AN, Henckel J, DeDecker BS, Johnson CM, Nikolova PV, Proctor MR, Lane DP, Fersht AR | title = Thermodynamic stability of wild-type and mutant p53 core domain | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 94 | issue = 26 | pages = 14338–42 | date = December 1997 | pmid = 9405613 | pmc = 24967 | doi = 10.1073/pnas.94.26.14338 }}</ref>

Suppression of p53 in human breast cancer cells is shown to lead to increased [[CXCR5]] chemokine receptor gene expression and activated cell migration in response to [[chemokine]] [[CXCL13]].<ref name="pmid25786345">{{cite journal | vauthors = Mitkin NA, Hook CD, Schwartz AM, Biswas S, Kochetkov DV, Muratova AM, Afanasyeva MA, Kravchenko JE, Bhattacharyya A, Kuprash DV | title = p53-dependent expression of CXCR5 chemokine receptor in MCF-7 breast cancer cells | journal = Scientific Reports | volume = 5 | issue = 5 | pages = 9330 | date = March 2015 | pmid = 25786345 | pmc = 4365401 | doi = 10.1038/srep09330 }}</ref>

One study found that p53 and [[Myc]] proteins were key to the survival of [[Chronic myeloid leukaemia|Chronic Myeloid Leukaemia]] (CML) cells. Targeting p53 and Myc proteins with drugs gave positive results on mice with CML.<ref>{{cite journal | vauthors = Abraham SA, Hopcroft LE, Carrick E, Drotar ME, Dunn K, Williamson AJ, Korfi K, Baquero P, Park LE, Scott MT, Pellicano F, Pierce A, Copland M, Nourse C, Grimmond SM, Vetrie D, Whetton AD, Holyoake TL | title = Dual targeting of p53 and c-MYC selectively eliminates leukaemic stem cells | journal = Nature | volume = 534 | issue = 7607 | pages = 341–6 | date = June 2016 | pmid = 27281222 | pmc = 4913876 | doi = 10.1038/nature18288 }}</ref><ref>{{Cite web|url=https://www.myscience.org.uk/news/2016/cientists_identify_drugs_to_target_achilles_heel_of_chronic_myeloid_leukaemia_cells-2016-glasgow|title=Scientists identify drugs to target ’Achilles heel’ of Chronic Myeloid Leukaemia cells|date=2016-06-08|website=myScience|access-date=2016-06-09}}</ref>

== Experimental analysis of p53 mutations ==
Most p53 mutations are detected by DNA sequencing. However, it is known that single missense mutations can have a large spectrum from rather mild to very severe functional affects.<ref name="Bullock_1997" />

The large spectrum of cancer phenotypes due to mutations in the ''TP53'' gene is also supported by the fact that different [[protein isoform|isoforms]] of p53 proteins have different cellular mechanisms for prevention against cancer. Mutations in ''TP53'' can give rise to different isoforms, preventing their overall functionality in different cellular mechanisms and thereby extending the cancer phenotype from mild to severe. Recents studies show that p53 isoforms are differentially expressed in different human tissues, and the [[mutation|loss-of-function or gain-of-function mutations]] within the isoforms can cause tissue-specific cancer or provides cancer [[stem cell]] [[cell potency|potential]] in different tissues.<ref name="Bourdon" /><ref name="pmid21779513">{{cite journal | vauthors = Khoury MP, Bourdon JC | title = p53 Isoforms: An Intracellular Microprocessor? | journal = Genes & Cancer | volume = 2 | issue = 4 | pages = 453–65 | date = April 2011 | pmid = 21779513 | pmc = 3135639 | doi = 10.1177/1947601911408893 }}</ref><ref>{{cite journal | vauthors = Avery-Kiejda KA, Morten B, Wong-Brown MW, Mathe A, Scott RJ | title = The relative mRNA expression of p53 isoforms in breast cancer is associated with clinical features and outcome | journal = Carcinogenesis | volume = 35 | issue = 3 | pages = 586–96 | date = March 2014 | pmid = 24336193 | doi = 10.1093/carcin/bgt411 }}</ref><ref>{{cite journal | vauthors = Arsic N, Gadea G, Lagerqvist EL, Busson M, Cahuzac N, Brock C, Hollande F, Gire V, Pannequin J, Roux P | title = The p53 isoform Δ133p53β promotes cancer stem cell potential | journal = Stem Cell Reports | volume = 4 | issue = 4 | pages = 531–40 | date = April 2015 | pmid = 25754205 | pmc = 4400643 | doi = 10.1016/j.stemcr.2015.02.001 }}</ref> TP53 mutation also hits energy metabolism and increases glycolysis in breast cancer cells.<ref>{{cite journal | vauthors = Harami-Papp H, Pongor LS, Munkácsy G, Horváth G, Nagy ÁM, Ambrus A, Hauser P, Szabó A, Tretter L, Győrffy B | title = TP53 mutation hits energy metabolism and increases glycolysis in breast cancer | journal = Oncotarget | volume = 7 | issue = 41 | pages = 67183–67195 | date = October 2016 | pmid = 27582538 | pmc = 5341867 | doi = 10.18632/oncotarget.11594 }}</ref>

The dynamics of p53 proteins, along with its antagonist [[Mdm2]], indicate that the levels of p53, in units of concentration, [[oscillation|oscillate]] as a function of time. This "[[damping|damped]]" oscillation is both clinically documented <ref>{{cite journal | vauthors = Geva-Zatorsky N, Rosenfeld N, Itzkovitz S, Milo R, Sigal A, Dekel E, Yarnitzky T, Liron Y, Polak P, Lahav G, Alon U | title = Oscillations and variability in the p53 system | journal = Molecular Systems Biology | volume = 2 | pages = 2006.0033 | date = June 2006 | pmid = 16773083 | pmc = 1681500 | doi = 10.1038/msb4100068 }}</ref> and [[Mathematical modelling|mathematically modelled]].<ref>{{cite journal | vauthors = Proctor CJ, Gray DA | title = Explaining oscillations and variability in the p53-Mdm2 system | journal = BMC Systems Biology | volume = 2 | issue = 75 | pages = 75 | date = August 2008 | pmid = 18706112 | pmc = 2553322 | doi = 10.1186/1752-0509-2-75 }}</ref><ref>{{cite journal | vauthors = Chong KH, Samarasinghe S, Kulasiri D | title = Mathematical modelling of p53 basal dynamics and DNA damage response | journal = C-fACS | issue = 20th International Congress on Mathematical Modelling and Simulation | pages = 670–6 | date = December 2013}}</ref> Mathematical models also indicate that the p53 concentration oscillates much faster once teratogens, such as [[DNA repair|double-stranded breaks (DSB) or UV radiation]], are introduced to the [[Systems biology|system]]. This supports and models the current understanding of p53 dynamics, where DNA damage induces p53 activation (see [[#Regulation|p53 regulation]] for more information). Current models can also be useful for modelling the mutations in p53 isoforms and their effects on p53 oscillation, thereby promoting ''de novo'' tissue-specific pharmacological [[drug discovery]].

== Discovery ==
p53 was identified in 1979 by [[Lionel Crawford]], [[David P. Lane]], [[Arnold J. Levine|Arnold Levine]], and [[Lloyd Old]], working at [[Imperial Cancer Research Fund]] (UK) [[Princeton University]]/UMDNJ (Cancer Institute of New Jersey), and [[Memorial Sloan-Kettering Cancer Center]], respectively. It had been hypothesized to exist before as the target of the [[SV40]] virus, a strain that induced development of tumors. The ''TP53'' gene from the mouse was first cloned by [[Peter Chumakov]] of the [[Russian Academy of Sciences]] in 1982,<ref name="pmid6295732">{{cite journal | vauthors = Chumakov PM, Iotsova VS, Georgiev GP | title = [Isolation of a plasmid clone containing the mRNA sequence for mouse nonviral T-antigen] | language = Russian | journal = Doklady Akademii Nauk SSSR | volume = 267 | issue = 5 | pages = 1272–5 | year = 1982 | pmid = 6295732 | doi =  }}</ref> and independently in 1983 by [[Moshe Oren]] in collaboration with [[David Givol]] ([[Weizmann Institute of Science]]).<ref name="pmid6296874">{{cite journal | vauthors = Oren M, Levine AJ | title = Molecular cloning of a cDNA specific for the murine p53 cellular tumor antigen | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 80 | issue = 1 | pages = 56–9 | date = January 1983 | pmid = 6296874 | pmc = 393308 | doi = 10.1073/pnas.80.1.56 }}</ref><ref name="pmid6646235">{{cite journal | vauthors = Zakut-Houri R, Oren M, Bienz B, Lavie V, Hazum S, Givol D | title = A single gene and a pseudogene for the cellular tumour antigen p53 | journal = Nature | volume = 306 | issue = 5943 | pages = 594–7 | year = 1983 | pmid = 6646235 | doi = 10.1038/306594a0 }}</ref> The human ''TP53'' gene was cloned in 1984<ref name="pmid6396087" /> and the full length clone in 1985.<ref name="pmid4006916">{{cite journal | vauthors = Zakut-Houri R, Bienz-Tadmor B, Givol D, Oren M | title = Human p53 cellular tumor antigen: cDNA sequence and expression in COS cells | journal = The EMBO Journal | volume = 4 | issue = 5 | pages = 1251–5 | date = May 1985 | pmid = 4006916 | pmc = 554332 | doi =  }}</ref>

It was initially presumed to be an [[oncogene]] due to the use of mutated [[cDNA]] following purification of tumor cell [[mRNA]]. Its role as a [[tumor suppressor gene]] was revealed in 1989 by [[Bert Vogelstein]] at the [[Johns Hopkins School of Medicine]] and [[Arnold J. Levine|Arnold Levine]] at Princeton University.<ref name="pmid2649981">{{cite journal | vauthors = Baker SJ, Fearon ER, Nigro JM, Hamilton SR, Preisinger AC, Jessup JM, vanTuinen P, Ledbetter DH, Barker DF, Nakamura Y, White R, Vogelstein B | title = Chromosome 17 deletions and p53 gene mutations in colorectal carcinomas | journal = Science | volume = 244 | issue = 4901 | pages = 217–21 | date = April 1989 | pmid = 2649981 | doi = 10.1126/science.2649981 }}</ref><ref>{{cite journal | vauthors = Finlay CA, Hinds PW, Levine AJ | title = The p53 proto-oncogene can act as a suppressor of transformation | journal = Cell | volume = 57 | issue = 7 | pages = 1083–93 | date = June 1989 | pmid = 2525423 | doi = 10.1016/0092-8674(89)90045-7 }}</ref>

Warren Maltzman, of the Waksman Institute of Rutgers University first demonstrated that TP53 was responsive to DNA damage in the form of ultraviolet radiation.<ref name="pmid6092932">{{cite journal | vauthors = Maltzman W, Czyzyk L | title = UV irradiation stimulates levels of p53 cellular tumor antigen in nontransformed mouse cells | journal = Molecular and Cellular Biology | volume = 4 | issue = 9 | pages = 1689–94 | date = September 1984 | pmid = 6092932 | pmc = 368974 | doi = 10.1128/mcb.4.9.1689 }}</ref> In a series of publications in 1991–92, Michael Kastan of [[Johns Hopkins University]], reported that TP53 was a critical part of a signal transduction pathway that helped cells respond to DNA damage.<ref name="pmid8013425">{{cite journal | vauthors = Kastan MB, Kuerbitz SJ | title = Control of G1 arrest after DNA damage | journal = Environmental Health Perspectives | volume = 101 Suppl 5 | issue = Suppl 5 | pages = 55–8 | date = December 1993 | pmid = 8013425 | pmc = 1519427 | doi = 10.2307/3431842 }}</ref>

In 1993, p53 was voted ''molecule of the year'' by [[Science (journal)|Science]] magazine.<ref name="pmid8266084">{{cite journal | vauthors = Koshland DE | title = Molecule of the year | journal = Science | volume = 262 | issue = 5142 | pages = 1953 | date = December 1993 | pmid = 8266084 | doi = 10.1126/science.8266084 }}</ref>

== Isoforms ==

As with 95% of human genes, TP53 encodes more than one protein. In 2005 several [[protein isoform|isoforms]] were discovered and until now, 12 human p53 isoforms were identified (p53α, p53β, p53γ, ∆40p53α, ∆40p53β, ∆40p53γ, ∆133p53α, ∆133p53β, ∆133p53γ, ∆160p53α, ∆160p53β, ∆160p53γ). Furthermore, p53 isoforms are expressed in a tissue dependent manner and p53α is never expressed alone.<ref name="Bourdon">{{cite journal | vauthors = Bourdon JC, Fernandes K, Murray-Zmijewski F, Liu G, Diot A, Xirodimas DP, Saville MK, Lane DP | title = p53 isoforms can regulate p53 transcriptional activity | journal = Genes & Development | volume = 19 | issue = 18 | pages = 2122–37 | date = September 2005 | pmid = 16131611 | pmc = 1221884 | doi = 10.1101/gad.1339905 }}</ref>

The full length p53 isoform proteins can be subdivided into different [[protein domain]]s. Starting from the N-terminus, there are first the amino-terminal transactivation domains (TAD 1, TAD 2), which are needed to induce a subset of p53 target genes. This domain is followed by the Proline rich domain (PXXP), whereby the motif PXXP is repeated (P is a Proline and X can be any amino acid). It is required among others for p53 mediated [[apoptosis]].<ref>{{cite journal | vauthors = Zhu J, Zhang S, Jiang J, Chen X | title = Definition of the p53 functional domains necessary for inducing apoptosis | journal = The Journal of Biological Chemistry | volume = 275 | issue = 51 | pages = 39927–34 | date = December 2000 | pmid = 10982799 | doi = 10.1074/jbc.M005676200 }}</ref> Some isoforms lack the Proline rich domain, such as Δ133p53β,γ and Δ160p53α,β,γ; hence some isoforms of p53 are not mediating apoptosis, emphasizing the diversifying roles of the ''TP53'' gene.<ref name="pmid21779513" /> Afterwards there is the DNA binding domain (DBD), which enables the proteins to sequence specific binding. The [[C-terminus|carboxyl terminal]] domain completes the protein. It includes the nuclear localization signal (NLS), the nuclear export signal (NES) and the oligomerisation domain (OD). The NLS and NES are responsible for the subcellular regulation of p53. Through the OD, p53 can form a tetramer and then bind to DNA. Among the isoforms, some domains can be missing, but all of them share most of the highly conserved DNA-binding domain.

The isoforms are formed by different mechanisms. The beta and the gamma isoforms are generated by multiple splicing of intron 9, which leads to a different C-terminus. Furthermore, the usage of an internal promoter in intron 4 causes the ∆133 and ∆160 isoforms, which lack the TAD domain and a part of the DBD. Moreover, alternative initiation of translation at codon 40 or 160 bear the ∆40p53 and ∆160p53 isoforms.<ref name="Bourdon" />

Due to the [[isoform]]ic nature of p53 proteins, there have been several sources of evidence showing that mutations within the ''TP53'' gene giving rise to mutated isoforms are causative agents of various cancer phenotypes, from mild to severe, due to single mutation in the ''TP53'' gene (refer to section [[#Experimental analysis of p53 mutations|Experimental analysis of p53 mutations]] for more details).

== Interactions ==
p53 has been shown to [[Protein-protein interaction|interact]] with:
{{div col|colwidth=20em}}
* [[Multisynthetase complex auxiliary component p38|AIMP2]],<ref name = pmid18695251>{{cite journal | vauthors = Han JM, Park BJ, Park SG, Oh YS, Choi SJ, Lee SW, Hwang SK, Chang SH, Cho MH, Kim S | title = AIMP2/p38, the scaffold for the multi-tRNA synthetase complex, responds to genotoxic stresses via p53 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 105 | issue = 32 | pages = 11206–11 | date = August 2008 | pmid = 18695251 | pmc = 2516205 | doi = 10.1073/pnas.0800297105 }}</ref>
* [[ANKRD2]],<ref name = pmid15136035 />
* [[Aprataxin|APTX]],<ref name = pmid15044383 />
* [[Ataxia telangiectasia mutated|ATM]],<ref name="Fabbro_2004">{{cite journal | vauthors = Fabbro M, Savage K, Hobson K, Deans AJ, Powell SN, McArthur GA, Khanna KK | title = BRCA1-BARD1 complexes are required for p53Ser-15 phosphorylation and a G1/S arrest following ionizing radiation-induced DNA damage | journal = The Journal of Biological Chemistry | volume = 279 | issue = 30 | pages = 31251–8 | date = July 2004 | pmid = 15159397 | doi = 10.1074/jbc.M405372200 }}</ref><ref name = pmid10608806 /><ref name = pmid15632067>{{cite journal | vauthors = Kang J, Ferguson D, Song H, Bassing C, Eckersdorff M, Alt FW, Xu Y | title = Functional interaction of H2AX, NBS1, and p53 in ATM-dependent DNA damage responses and tumor suppression | journal = Molecular and Cellular Biology | volume = 25 | issue = 2 | pages = 661–70 | date = January 2005 | pmid = 15632067 | pmc = 543410 | doi = 10.1128/MCB.25.2.661-670.2005 }}</ref><ref name = pmid9843217>{{cite journal | vauthors = Khanna KK, Keating KE, Kozlov S, Scott S, Gatei M, Hobson K, Taya Y, Gabrielli B, Chan D, Lees-Miller SP, Lavin MF | title = ATM associates with and phosphorylates p53: mapping the region of interaction | journal = Nature Genetics | volume = 20 | issue = 4 | pages = 398–400 | date = December 1998 | pmid = 9843217 | doi = 10.1038/3882 }}</ref><ref name = pmid9135004>{{cite journal | vauthors = Westphal CH, Schmaltz C, Rowan S, Elson A, Fisher DE, Leder P | title = Genetic interactions between atm and p53 influence cellular proliferation and irradiation-induced cell cycle checkpoints | journal = Cancer Research | volume = 57 | issue = 9 | pages = 1664–7 | date = May 1997 | pmid = 9135004 | doi =  }}</ref>
* [[Ataxia telangiectasia and Rad3 related|ATR]],<ref name="Fabbro_2004" /><ref name = pmid10608806>{{cite journal | vauthors = Kim ST, Lim DS, Canman CE, Kastan MB | title = Substrate specificities and identification of putative substrates of ATM kinase family members | journal = The Journal of Biological Chemistry | volume = 274 | issue = 53 | pages = 37538–43 | date = December 1999 | pmid = 10608806 | doi = 10.1074/jbc.274.53.37538 }}</ref>
* [[ATF3]],<ref name="pmid16169070">{{cite journal | vauthors = Stelzl U, Worm U, Lalowski M, Haenig C, Brembeck FH, Goehler H, Stroedicke M, Zenkner M, Schoenherr A, Koeppen S, Timm J, Mintzlaff S, Abraham C, Bock N, Kietzmann S, Goedde A, Toksöz E, Droege A, Krobitsch S, Korn B, Birchmeier W, Lehrach H, Wanker EE | title = A human protein-protein interaction network: a resource for annotating the proteome | journal = Cell | volume = 122 | issue = 6 | pages = 957–68 | date = September 2005 | pmid = 16169070 | doi = 10.1016/j.cell.2005.08.029 }}</ref><ref name = pmid11792711>{{cite journal | vauthors = Yan C, Wang H, Boyd DD | title = ATF3 represses 72-kDa type IV collagenase (MMP-2) expression by antagonizing p53-dependent trans-activation of the collagenase promoter | journal = The Journal of Biological Chemistry | volume = 277 | issue = 13 | pages = 10804–12 | date = March 2002 | pmid = 11792711 | doi = 10.1074/jbc.M112069200 }}</ref>
* [[Aurora A kinase|AURKA]],<ref name = pmid12198151>{{cite journal | vauthors = Chen SS, Chang PC, Cheng YW, Tang FM, Lin YS | title = Suppression of the STK15 oncogenic activity requires a transactivation-independent p53 function | journal = The EMBO Journal | volume = 21 | issue = 17 | pages = 4491–9 | date = September 2002 | pmid = 12198151 | pmc = 126178 | doi = 10.1093/emboj/cdf409 }}</ref>
* [[BAK1]],<ref name = pmid15077116>{{cite journal | vauthors = Leu JI, Dumont P, Hafey M, Murphy ME, George DL | title = Mitochondrial p53 activates Bak and causes disruption of a Bak-Mcl1 complex | journal = Nature Cell Biology | volume = 6 | issue = 5 | pages = 443–50 | date = May 2004 | pmid = 15077116 | doi = 10.1038/ncb1123 }}</ref>
* [[BARD1]],<ref name = pmid14636569 />
* [[Bloom syndrome protein|BLM]],<ref name = pmid15364958 /><ref name = pmid11399766>{{cite journal | vauthors = Wang XW, Tseng A, Ellis NA, Spillare EA, Linke SP, Robles AI, Seker H, Yang Q, Hu P, Beresten S, Bemmels NA, Garfield S, Harris CC | title = Functional interaction of p53 and BLM DNA helicase in apoptosis | journal = The Journal of Biological Chemistry | volume = 276 | issue = 35 | pages = 32948–55 | date = August 2001 | pmid = 11399766 | doi = 10.1074/jbc.M103298200 }}</ref><ref name = pmid11781842>{{cite journal | vauthors = Garkavtsev IV, Kley N, Grigorian IA, Gudkov AV | title = The Bloom syndrome protein interacts and cooperates with p53 in regulation of transcription and cell growth control | journal = Oncogene | volume = 20 | issue = 57 | pages = 8276–80 | date = December 2001 | pmid = 11781842 | doi = 10.1038/sj.onc.1205120 }}</ref><ref name = pmid12080066 />
* [[BRCA1]],<ref name = pmid14636569 /><ref name = pmid14710355>{{cite journal | vauthors = Abramovitch S, Werner H | title = Functional and physical interactions between BRCA1 and p53 in transcriptional regulation of the IGF-IR gene | journal = Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme | volume = 35 | issue = 11-12 | pages = 758–62 | year = 2003 | pmid = 14710355 | doi = 10.1055/s-2004-814154 }}</ref><ref name = pmid9482880>{{cite journal | vauthors = Ouchi T, Monteiro AN, August A, Aaronson SA, Hanafusa H | title = BRCA1 regulates p53-dependent gene expression | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 95 | issue = 5 | pages = 2302–6 | date = March 1998 | pmid = 9482880 | pmc = 19327 | doi = 10.1073/pnas.95.5.2302 }}</ref><ref name = pmid9926942>{{cite journal | vauthors = Chai YL, Cui J, Shao N, Shyam E, Reddy P, Rao VN | title = The second BRCT domain of BRCA1 proteins interacts with p53 and stimulates transcription from the p21WAF1/CIP1 promoter | journal = Oncogene | volume = 18 | issue = 1 | pages = 263–8 | date = January 1999 | pmid = 9926942 | doi = 10.1038/sj.onc.1202323 }}</ref><ref name = pmid9582019>{{cite journal | vauthors = Zhang H, Somasundaram K, Peng Y, Tian H, Zhang H, Bi D, Weber BL, El-Deiry WS | title = BRCA1 physically associates with p53 and stimulates its transcriptional activity | journal = Oncogene | volume = 16 | issue = 13 | pages = 1713–21 | date = April 1998 | pmid = 9582019 | doi = 10.1038/sj.onc.1201932 }}</ref>
* [[BRCA2]],<ref name = pmid14636569 /><ref name = pmid9811893>{{cite journal | vauthors = Marmorstein LY, Ouchi T, Aaronson SA | title = The BRCA2 gene product functionally interacts with p53 and RAD51 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 95 | issue = 23 | pages = 13869–74 | date = November 1998 | pmid = 9811893 | pmc = 24938 | doi = 10.1073/pnas.95.23.13869 }}</ref>
* [[BRCC3]],<ref name = pmid14636569 />
* [[BRE (gene)|BRE]],<ref name = pmid14636569>{{cite journal | vauthors = Dong Y, Hakimi MA, Chen X, Kumaraswamy E, Cooch NS, Godwin AK, Shiekhattar R | title = Regulation of BRCC, a holoenzyme complex containing BRCA1 and BRCA2, by a signalosome-like subunit and its role in DNA repair | journal = Molecular Cell | volume = 12 | issue = 5 | pages = 1087–99 | date = November 2003 | pmid = 14636569 | doi = 10.1016/S1097-2765(03)00424-6 }}</ref>
* [[CCAAT/enhancer binding protein zeta|CEBPZ]],<ref name = pmid12534345>{{cite journal | vauthors = Uramoto H, Izumi H, Nagatani G, Ohmori H, Nagasue N, Ise T, Yoshida T, Yasumoto K, Kohno K | title = Physical interaction of tumour suppressor p53/p73 with CCAAT-binding transcription factor 2 (CTF2) and differential regulation of human high-mobility group 1 (HMG1) gene expression | journal = The Biochemical Journal | volume = 371 | issue = Pt 2 | pages = 301–10 | date = April 2003 | pmid = 12534345 | pmc = 1223307 | doi = 10.1042/BJ20021646 }}</ref>
* [[CDC14A]],<ref name = pmid10644693 />
* [[Cdk1]],<ref name = pmid10884347>{{cite journal | vauthors = Luciani MG, Hutchins JR, Zheleva D, Hupp TR | title = The C-terminal regulatory domain of p53 contains a functional docking site for cyclin A | journal = Journal of Molecular Biology | volume = 300 | issue = 3 | pages = 503–18 | date = July 2000 | pmid = 10884347 | doi = 10.1006/jmbi.2000.3830 }}</ref><ref name = pmid11327730>{{cite journal | vauthors = Ababneh M, Götz C, Montenarh M | title = Downregulation of the cdc2/cyclin B protein kinase activity by binding of p53 to p34(cdc2) | journal = Biochemical and Biophysical Research Communications | volume = 283 | issue = 2 | pages = 507–12 | date = May 2001 | pmid = 11327730 | doi = 10.1006/bbrc.2001.4792 }}</ref>
* [[CFLAR]],<ref name = pmid18559494>{{cite journal | vauthors = Abedini MR, Muller EJ, Brun J, Bergeron R, Gray DA, Tsang BK | title = Cisplatin induces p53-dependent FLICE-like inhibitory protein ubiquitination in ovarian cancer cells | journal = Cancer Research | volume = 68 | issue = 12 | pages = 4511–7 | date = June 2008 | pmid = 18559494 | doi = 10.1158/0008-5472.CAN-08-0673 }}</ref>
* [[CHEK1]],<ref name = pmid15364958>{{cite journal | vauthors = Sengupta S, Robles AI, Linke SP, Sinogeeva NI, Zhang R, Pedeux R, Ward IM, Celeste A, Nussenzweig A, Chen J, Halazonetis TD, Harris CC | title = Functional interaction between BLM helicase and 53BP1 in a Chk1-mediated pathway during S-phase arrest | journal = The Journal of Cell Biology | volume = 166 | issue = 6 | pages = 801–13 | date = September 2004 | pmid = 15364958 | pmc = 2172115 | doi = 10.1083/jcb.200405128 }}</ref><ref name = pmid12756247 /><ref name = pmid11896572>{{cite journal | vauthors = Tian H, Faje AT, Lee SL, Jorgensen TJ | title = Radiation-induced phosphorylation of Chk1 at S345 is associated with p53-dependent cell cycle arrest pathways | journal = Neoplasia | volume = 4 | issue = 2 | pages = 171–80 | year = 2002 | pmid = 11896572 | pmc = 1550321 | doi = 10.1038/sj/neo/7900219 }}</ref>
* [[CCNG1]],<ref name = pmid12556559>{{cite journal | vauthors = Zhao L, Samuels T, Winckler S, Korgaonkar C, Tompkins V, Horne MC, Quelle DE | title = Cyclin G1 has growth inhibitory activity linked to the ARF-Mdm2-p53 and pRb tumor suppressor pathways | journal = Molecular Cancer Research | volume = 1 | issue = 3 | pages = 195–206 | date = January 2003 | pmid = 12556559 | doi =  }}</ref>
* [[CREB-binding protein|CREBBP]],<ref name = pmid12426395>{{cite journal | vauthors = Ito A, Kawaguchi Y, Lai CH, Kovacs JJ, Higashimoto Y, Appella E, Yao TP | title = MDM2-HDAC1-mediated deacetylation of p53 is required for its degradation | journal = The EMBO Journal | volume = 21 | issue = 22 | pages = 6236–45 | date = November 2002 | pmid = 12426395 | pmc = 137207 | doi = 10.1093/emboj/cdf616 }}</ref><ref name = pmid11782467 /><ref name = pmid10848610 />
* [[CREB1]],<ref name = pmid10848610>{{cite journal | vauthors = Giebler HA, Lemasson I, Nyborg JK | title = p53 recruitment of CREB binding protein mediated through phosphorylated CREB: a novel pathway of tumor suppressor regulation | journal = Molecular and Cellular Biology | volume = 20 | issue = 13 | pages = 4849–58 | date = July 2000 | pmid = 10848610 | pmc = 85936 | doi = 10.1128/MCB.20.13.4849-4858.2000 }}</ref>
* [[Cyclin H]],<ref name = pmid9840937>{{cite journal | vauthors = Schneider E, Montenarh M, Wagner P | title = Regulation of CAK kinase activity by p53 | journal = Oncogene | volume = 17 | issue = 21 | pages = 2733–41 | date = November 1998 | pmid = 9840937 | doi = 10.1038/sj.onc.1202504 }}</ref>
* [[Cyclin-dependent kinase 7|CDK7]],<ref name = pmid9840937 /><ref name = pmid9372954>{{cite journal | vauthors = Ko LJ, Shieh SY, Chen X, Jayaraman L, Tamai K, Taya Y, Prives C, Pan ZQ | title = p53 is phosphorylated by CDK7-cyclin H in a p36MAT1-dependent manner | journal = Molecular and Cellular Biology | volume = 17 | issue = 12 | pages = 7220–9 | date = December 1997 | pmid = 9372954 | pmc = 232579 | doi = 10.1128/mcb.17.12.7220 }}</ref>
* [[DNA-PKcs]],<ref name = pmid10608806 /><ref name = pmid12756247>{{cite journal | vauthors = Goudelock DM, Jiang K, Pereira E, Russell B, Sanchez Y | title = Regulatory interactions between the checkpoint kinase Chk1 and the proteins of the DNA-dependent protein kinase complex | journal = The Journal of Biological Chemistry | volume = 278 | issue = 32 | pages = 29940–7 | date = August 2003 | pmid = 12756247 | doi = 10.1074/jbc.M301765200 }}</ref><ref name = pmid9679063>{{cite journal | vauthors = Yavuzer U, Smith GC, Bliss T, Werner D, Jackson SP | title = DNA end-independent activation of DNA-PK mediated via association with the DNA-binding protein C1D | journal = Genes & Development | volume = 12 | issue = 14 | pages = 2188–99 | date = July 1998 | pmid = 9679063 | pmc = 317006 | doi = 10.1101/gad.12.14.2188 }}</ref>
* [[E4F1]],<ref name = pmid12446718>{{cite journal | vauthors = Rizos H, Diefenbach E, Badhwar P, Woodruff S, Becker TM, Rooney RJ, Kefford RF | title = Association of p14ARF with the p120E4F transcriptional repressor enhances cell cycle inhibition | journal = The Journal of Biological Chemistry | volume = 278 | issue = 7 | pages = 4981–9 | date = February 2003 | pmid = 12446718 | doi = 10.1074/jbc.M210978200 }}</ref><ref name = pmid10644996>{{cite journal | vauthors = Sandy P, Gostissa M, Fogal V, Cecco LD, Szalay K, Rooney RJ, Schneider C, Del Sal G | title = p53 is involved in the p120E4F-mediated growth arrest | journal = Oncogene | volume = 19 | issue = 2 | pages = 188–99 | date = January 2000 | pmid = 10644996 | doi = 10.1038/sj.onc.1203250 }}</ref>
* [[EFEMP2]],<ref name = pmid10380882>{{cite journal | vauthors = Gallagher WM, Argentini M, Sierra V, Bracco L, Debussche L, Conseiller E | title = MBP1: a novel mutant p53-specific protein partner with oncogenic properties | journal = Oncogene | volume = 18 | issue = 24 | pages = 3608–16 | date = June 1999 | pmid = 10380882 | doi = 10.1038/sj.onc.1202937 }}</ref>
* [[Protein kinase R|EIF2AK2]],<ref name = pmid10348343>{{cite journal | vauthors = Cuddihy AR, Wong AH, Tam NW, Li S, Koromilas AE | title = The double-stranded RNA activated protein kinase PKR physically associates with the tumor suppressor p53 protein and phosphorylates human p53 on serine 392 in vitro | journal = Oncogene | volume = 18 | issue = 17 | pages = 2690–702 | date = April 1999 | pmid = 10348343 | doi = 10.1038/sj.onc.1202620 }}</ref>
* [[ELL (gene)|ELL]],<ref name = pmid10358050>{{cite journal | vauthors = Shinobu N, Maeda T, Aso T, Ito T, Kondo T, Koike K, Hatakeyama M | title = Physical interaction and functional antagonism between the RNA polymerase II elongation factor ELL and p53 | journal = The Journal of Biological Chemistry | volume = 274 | issue = 24 | pages = 17003–10 | date = June 1999 | pmid = 10358050 | doi = 10.1074/jbc.274.24.17003 }}</ref>
* [[EP300]],<ref name = pmid11782467>{{cite journal | vauthors = Livengood JA, Scoggin KE, Van Orden K, McBryant SJ, Edayathumangalam RS, Laybourn PJ, Nyborg JK | title = p53 Transcriptional activity is mediated through the SRC1-interacting domain of CBP/p300 | journal = The Journal of Biological Chemistry | volume = 277 | issue = 11 | pages = 9054–61 | date = March 2002 | pmid = 11782467 | doi = 10.1074/jbc.M108870200 }}</ref><ref name="pmid9809062">{{cite journal | vauthors = Grossman SR, Perez M, Kung AL, Joseph M, Mansur C, Xiao ZX, Kumar S, Howley PM, Livingston DM | title = p300/MDM2 complexes participate in MDM2-mediated p53 degradation | journal = Molecular Cell | volume = 2 | issue = 4 | pages = 405–15 | date = October 1998 | pmid = 9809062 | doi = 10.1016/S1097-2765(00)80140-9 }}</ref><ref name = pmid15186775>{{cite journal | vauthors = An W, Kim J, Roeder RG | title = Ordered cooperative functions of PRMT1, p300, and CARM1 in transcriptional activation by p53 | journal = Cell | volume = 117 | issue = 6 | pages = 735–48 | date = June 2004 | pmid = 15186775 | doi = 10.1016/j.cell.2004.05.009 }}</ref><ref name = pmid10942770>{{cite journal | vauthors = Pastorcic M, Das HK | title = Regulation of transcription of the human presenilin-1 gene by ets transcription factors and the p53 protooncogene | journal = The Journal of Biological Chemistry | volume = 275 | issue = 45 | pages = 34938–45 | date = November 2000 | pmid = 10942770 | doi = 10.1074/jbc.M005411200 }}</ref>
* [[ERCC6]],<ref name = pmid7663514>{{cite journal | vauthors = Wang XW, Yeh H, Schaeffer L, Roy R, Moncollin V, Egly JM, Wang Z, Freidberg EC, Evans MK, Taffe BG | title = p53 modulation of TFIIH-associated nucleotide excision repair activity | journal = Nature Genetics | volume = 10 | issue = 2 | pages = 188–95 | date = June 1995 | pmid = 7663514 | doi = 10.1038/ng0695-188 }}</ref><ref name = pmid10882116>{{cite journal | vauthors = Yu A, Fan HY, Liao D, Bailey AD, Weiner AM | title = Activation of p53 or loss of the Cockayne syndrome group B repair protein causes metaphase fragility of human U1, U2, and 5S genes | journal = Molecular Cell | volume = 5 | issue = 5 | pages = 801–10 | date = May 2000 | pmid = 10882116 | doi = 10.1016/S1097-2765(00)80320-2 }}</ref>
* [[GNL3]],<ref name = pmid12464630>{{cite journal | vauthors = Tsai RY, McKay RD | title = A nucleolar mechanism controlling cell proliferation in stem cells and cancer cells | journal = Genes & Development | volume = 16 | issue = 23 | pages = 2991–3003 | date = December 2002 | pmid = 12464630 | pmc = 187487 | doi = 10.1101/gad.55671 }}</ref>
* [[GPS2 (gene)|GPS2]],<ref name = pmid11486030>{{cite journal | vauthors = Peng YC, Kuo F, Breiding DE, Wang YF, Mansur CP, Androphy EJ | title = AMF1 (GPS2) modulates p53 transactivation | journal = Molecular and Cellular Biology | volume = 21 | issue = 17 | pages = 5913–24 | date = September 2001 | pmid = 11486030 | pmc = 87310 | doi = 10.1128/MCB.21.17.5913-5924.2001 }}</ref>
* [[GSK3B]],<ref name = pmid12048243>{{cite journal | vauthors = Watcharasit P, Bijur GN, Zmijewski JW, Song L, Zmijewska A, Chen X, Johnson GV, Jope RS | title = Direct, activating interaction between glycogen synthase kinase-3beta and p53 after DNA damage | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 99 | issue = 12 | pages = 7951–5 | date = June 2002 | pmid = 12048243 | pmc = 123001 | doi = 10.1073/pnas.122062299 }}</ref>
* [[Heat shock protein 90kDa alpha (cytosolic), member A1|HSP90AA1]],<ref name = pmid11297531 /><ref name = pmid12427754>{{cite journal | vauthors = Wang C, Chen J | title = Phosphorylation and hsp90 binding mediate heat shock stabilization of p53 | journal = The Journal of Biological Chemistry | volume = 278 | issue = 3 | pages = 2066–71 | date = January 2003 | pmid = 12427754 | doi = 10.1074/jbc.M206697200 }}</ref><ref name = pmid11507088>{{cite journal | vauthors = Peng Y, Chen L, Li C, Lu W, Chen J | title = Inhibition of MDM2 by hsp90 contributes to mutant p53 stabilization | journal = The Journal of Biological Chemistry | volume = 276 | issue = 44 | pages = 40583–90 | date = November 2001 | pmid = 11507088 | doi = 10.1074/jbc.M102817200 }}</ref>
* [[HIF1A]],<ref name = pmid12606552>{{cite journal | vauthors = Chen D, Li M, Luo J, Gu W | title = Direct interactions between HIF-1 alpha and Mdm2 modulate p53 function | journal = The Journal of Biological Chemistry | volume = 278 | issue = 16 | pages = 13595–8 | date = April 2003 | pmid = 12606552 | doi = 10.1074/jbc.C200694200 }}</ref><ref name = pmid10640274>{{cite journal | vauthors = Ravi R, Mookerjee B, Bhujwalla ZM, Sutter CH, Artemov D, Zeng Q, Dillehay LE, Madan A, Semenza GL, Bedi A | title = Regulation of tumor angiogenesis by p53-induced degradation of hypoxia-inducible factor 1alpha | journal = Genes & Development | volume = 14 | issue = 1 | pages = 34–44 | date = January 2000 | pmid = 10640274 | pmc = 316350 | doi = 10.1101/gad.14.1.34 }}</ref><ref name = pmid12124396>{{cite journal | vauthors = Hansson LO, Friedler A, Freund S, Rudiger S, Fersht AR | title = Two sequence motifs from HIF-1alpha bind to the DNA-binding site of p53 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 99 | issue = 16 | pages = 10305–9 | date = August 2002 | pmid = 12124396 | pmc = 124909 | doi = 10.1073/pnas.122347199 }}</ref><ref name = pmid9537326>{{cite journal | vauthors = An WG, Kanekal M, Simon MC, Maltepe E, Blagosklonny MV, Neckers LM | title = Stabilization of wild-type p53 by hypoxia-inducible factor 1alpha | journal = Nature | volume = 392 | issue = 6674 | pages = 405–8 | date = March 1998 | pmid = 9537326 | doi = 10.1038/32925 }}</ref>
* [[HIPK1]],<ref name = pmid12702766>{{cite journal | vauthors = Kondo S, Lu Y, Debbas M, Lin AW, Sarosi I, Itie A, Wakeham A, Tuan J, Saris C, Elliott G, Ma W, Benchimol S, Lowe SW, Mak TW, Thukral SK | title = Characterization of cells and gene-targeted mice deficient for the p53-binding kinase homeodomain-interacting protein kinase 1 (HIPK1) | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 100 | issue = 9 | pages = 5431–6 | date = April 2003 | pmid = 12702766 | pmc = 154362 | doi = 10.1073/pnas.0530308100 }}</ref>
* [[HIPK2]],<ref name = pmid11740489>{{cite journal | vauthors = Hofmann TG, Möller A, Sirma H, Zentgraf H, Taya Y, Dröge W, Will H, Schmitz ML | title = Regulation of p53 activity by its interaction with homeodomain-interacting protein kinase-2 | journal = Nature Cell Biology | volume = 4 | issue = 1 | pages = 1–10 | date = January 2002 | pmid = 11740489 | doi = 10.1038/ncb715 }}</ref><ref name = pmid11925430>{{cite journal | vauthors = Kim EJ, Park JS, Um SJ | title = Identification and characterization of HIPK2 interacting with p73 and modulating functions of the p53 family in vivo | journal = The Journal of Biological Chemistry | volume = 277 | issue = 35 | pages = 32020–8 | date = August 2002 | pmid = 11925430 | doi = 10.1074/jbc.M200153200 }}</ref>
* [[HMGB1]],<ref name = pmid11106654>{{cite journal | vauthors = Imamura T, Izumi H, Nagatani G, Ise T, Nomoto M, Iwamoto Y, Kohno K | title = Interaction with p53 enhances binding of cisplatin-modified DNA by high mobility group 1 protein | journal = The Journal of Biological Chemistry | volume = 276 | issue = 10 | pages = 7534–40 | date = March 2001 | pmid = 11106654 | doi = 10.1074/jbc.M008143200 }}</ref><ref name = pmid11748221>{{cite journal | vauthors = Dintilhac A, Bernués J | title = HMGB1 interacts with many apparently unrelated proteins by recognizing short amino acid sequences | journal = The Journal of Biological Chemistry | volume = 277 | issue = 9 | pages = 7021–8 | date = March 2002 | pmid = 11748221 | doi = 10.1074/jbc.M108417200 }}</ref>
* [[HSPA9]],<ref name = pmid11900485>{{cite journal | vauthors = Wadhwa R, Yaguchi T, Hasan MK, Mitsui Y, Reddel RR, Kaul SC | title = Hsp70 family member, mot-2/mthsp70/GRP75, binds to the cytoplasmic sequestration domain of the p53 protein | journal = Experimental Cell Research | volume = 274 | issue = 2 | pages = 246–53 | date = April 2002 | pmid = 11900485 | doi = 10.1006/excr.2002.5468 }}</ref>
* [[Huntingtin]],<ref name = pmid10823891>{{cite journal | vauthors = Steffan JS, Kazantsev A, Spasic-Boskovic O, Greenwald M, Zhu YZ, Gohler H, Wanker EE, Bates GP, Housman DE, Thompson LM | title = The Huntington's disease protein interacts with p53 and CREB-binding protein and represses transcription | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 97 | issue = 12 | pages = 6763–8 | date = June 2000 | pmid = 10823891 | pmc = 18731 | doi = 10.1073/pnas.100110097 }}</ref>
* [[ING1]],<ref name = pmid12208736>{{cite journal | vauthors = Leung KM, Po LS, Tsang FC, Siu WY, Lau A, Ho HT, Poon RY | title = The candidate tumor suppressor ING1b can stabilize p53 by disrupting the regulation of p53 by MDM2 | journal = Cancer Research | volume = 62 | issue = 17 | pages = 4890–3 | date = September 2002 | pmid = 12208736 | doi =  }}</ref><ref name = pmid9440695>{{cite journal | vauthors = Garkavtsev I, Grigorian IA, Ossovskaya VS, Chernov MV, Chumakov PM, Gudkov AV | title = The candidate tumour suppressor p33ING1 cooperates with p53 in cell growth control | journal = Nature | volume = 391 | issue = 6664 | pages = 295–8 | date = January 1998 | pmid = 9440695 | doi = 10.1038/34675 }}</ref>
* [[ING4]],<ref name = pmid12750254 /><ref name = pmid18775696>{{cite journal | vauthors = Tsai KW, Tseng HC, Lin WC | title = Two wobble-splicing events affect ING4 protein subnuclear localization and degradation | journal = Experimental Cell Research | volume = 314 | issue = 17 | pages = 3130–41 | date = October 2008 | pmid = 18775696 | doi = 10.1016/j.yexcr.2008.08.002 }}</ref>
* [[ING5]],<ref name = pmid12750254>{{cite journal | vauthors = Shiseki M, Nagashima M, Pedeux RM, Kitahama-Shiseki M, Miura K, Okamura S, Onogi H, Higashimoto Y, Appella E, Yokota J, Harris CC | title = p29ING4 and p28ING5 bind to p53 and p300, and enhance p53 activity | journal = Cancer Research | volume = 63 | issue = 10 | pages = 2373–8 | date = May 2003 | pmid = 12750254 | doi =  }}</ref>
* [[IκBα]],<ref name = pmid11799106>{{cite journal | vauthors = Chang NS | title = The non-ankyrin C terminus of Ikappa Balpha physically interacts with p53 in vivo and dissociates in response to apoptotic stress, hypoxia, DNA damage, and transforming growth factor-beta 1-mediated growth suppression | journal = The Journal of Biological Chemistry | volume = 277 | issue = 12 | pages = 10323–31 | date = March 2002 | pmid = 11799106 | doi = 10.1074/jbc.M106607200 }}</ref>
* [[KPNB1]],<ref name = pmid11297531>{{cite journal | vauthors = Akakura S, Yoshida M, Yoneda Y, Horinouchi S | title = A role for Hsc70 in regulating nucleocytoplasmic transport of a temperature-sensitive p53 (p53Val-135) | journal = The Journal of Biological Chemistry | volume = 276 | issue = 18 | pages = 14649–57 | date = May 2001 | pmid = 11297531 | doi = 10.1074/jbc.M100200200 }}</ref>
* [[LMO3]],<ref name="Larsen S, Yokochi T, Isogai E, Nakamura Y, Ozaki T, Nakagawara A 2010 252–7" />
* [[Mdm2]],<ref name = pmid12426395 /><ref name = pmid12915590 /><ref name = pmid12620407 /><ref name = pmid9529249 />
* [[MDM4]],<ref name = pmid12393902>{{cite journal | vauthors = Badciong JC, Haas AL | title = MdmX is a RING finger ubiquitin ligase capable of synergistically enhancing Mdm2 ubiquitination | journal = The Journal of Biological Chemistry | volume = 277 | issue = 51 | pages = 49668–75 | date = December 2002 | pmid = 12393902 | doi = 10.1074/jbc.M208593200 }}</ref><ref name = pmid9226370>{{cite journal | vauthors = Shvarts A, Bazuine M, Dekker P, Ramos YF, Steegenga WT, Merckx G, van Ham RC, van der Houven van Oordt W, van der Eb AJ, Jochemsen AG | title = Isolation and identification of the human homolog of a new p53-binding protein, Mdmx | journal = Genomics | volume = 43 | issue = 1 | pages = 34–42 | date = July 1997 | pmid = 9226370 | doi = 10.1006/geno.1997.4775 }}</ref>
* [[MED1]],<ref name = pmid11118038>{{cite journal | vauthors = Frade R, Balbo M, Barel M | title = RB18A, whose gene is localized on chromosome 17q12-q21.1, regulates in vivo p53 transactivating activity | journal = Cancer Research | volume = 60 | issue = 23 | pages = 6585–9 | date = December 2000 | pmid = 11118038 | doi =  }}</ref><ref name = pmid9444950>{{cite journal | vauthors = Drané P, Barel M, Balbo M, Frade R | title = Identification of RB18A, a 205 kDa new p53 regulatory protein which shares antigenic and functional properties with p53 | journal = Oncogene | volume = 15 | issue = 25 | pages = 3013–24 | date = December 1997 | pmid = 9444950 | doi = 10.1038/sj.onc.1201492 }}</ref>
* [[Mitogen-activated protein kinase 9|MAPK9]],<ref name = pmid9393873>{{cite journal | vauthors = Hu MC, Qiu WR, Wang YP | title = JNK1, JNK2 and JNK3 are p53 N-terminal serine 34 kinases | journal = Oncogene | volume = 15 | issue = 19 | pages = 2277–87 | date = November 1997 | pmid = 9393873 | doi = 10.1038/sj.onc.1201401 }}</ref><ref name = pmid12384512>{{cite journal | vauthors = Lin Y, Khokhlatchev A, Figeys D, Avruch J | title = Death-associated protein 4 binds MST1 and augments MST1-induced apoptosis | journal = The Journal of Biological Chemistry | volume = 277 | issue = 50 | pages = 47991–8001 | date = December 2002 | pmid = 12384512 | doi = 10.1074/jbc.M202630200 }}</ref>
* [[MNAT1]],<ref name = pmid9372954 />
* [[NDN (gene)|NDN]],<ref name = pmid10347180>{{cite journal | vauthors = Taniura H, Matsumoto K, Yoshikawa K | title = Physical and functional interactions of neuronal growth suppressor necdin with p53 | journal = The Journal of Biological Chemistry | volume = 274 | issue = 23 | pages = 16242–8 | date = June 1999 | pmid = 10347180 | doi = 10.1074/jbc.274.23.16242 }}</ref>
* [[Nucleolin|NCL]],<ref name = pmid12138209>{{cite journal | vauthors = Daniely Y, Dimitrova DD, Borowiec JA | title = Stress-dependent nucleolin mobilization mediated by p53-nucleolin complex formation | journal = Molecular and Cellular Biology | volume = 22 | issue = 16 | pages = 6014–22 | date = August 2002 | pmid = 12138209 | pmc = 133981 | doi = 10.1128/MCB.22.16.6014-6022.2002 }}</ref>
* [[NUMB (gene)|NUMB]],<ref name = pmid18172499>{{cite journal | vauthors = Colaluca IN, Tosoni D, Nuciforo P, Senic-Matuglia F, Galimberti V, Viale G, Pece S, Di Fiore PP | title = NUMB controls p53 tumour suppressor activity | journal = Nature | volume = 451 | issue = 7174 | pages = 76–80 | date = January 2008 | pmid = 18172499 | doi = 10.1038/nature06412 }}</ref>
* [[NF-κB]],<ref name=pmid20546595 />
* [[P16 (gene)|P16]],<ref name = pmid12446718 /><ref name = pmid9529249>{{cite journal | vauthors = Zhang Y, Xiong Y, Yarbrough WG | title = ARF promotes MDM2 degradation and stabilizes p53: ARF-INK4a locus deletion impairs both the Rb and p53 tumor suppression pathways | journal = Cell | volume = 92 | issue = 6 | pages = 725–34 | date = March 1998 | pmid = 9529249 | doi = 10.1016/S0092-8674(00)81401-4 }}</ref><ref name = pmid14612427 />
* [[PARC (gene)|PARC]],<ref name = pmid12526791>{{cite journal | vauthors = Nikolaev AY, Li M, Puskas N, Qin J, Gu W | title = Parc: a cytoplasmic anchor for p53 | journal = Cell | volume = 112 | issue = 1 | pages = 29–40 | date = January 2003 | pmid = 12526791 | doi = 10.1016/S0092-8674(02)01255-2 }}</ref>
* [[PARP1]],<ref name = pmid15044383>{{cite journal | vauthors = Gueven N, Becherel OJ, Kijas AW, Chen P, Howe O, Rudolph JH, Gatti R, Date H, Onodera O, Taucher-Scholz G, Lavin MF | title = Aprataxin, a novel protein that protects against genotoxic stress | journal = Human Molecular Genetics | volume = 13 | issue = 10 | pages = 1081–93 | date = May 2004 | pmid = 15044383 | doi = 10.1093/hmg/ddh122 }}</ref><ref name = pmid9565608>{{cite journal | vauthors = Malanga M, Pleschke JM, Kleczkowska HE, Althaus FR | title = Poly(ADP-ribose) binds to specific domains of p53 and alters its DNA binding functions | journal = The Journal of Biological Chemistry | volume = 273 | issue = 19 | pages = 11839–43 | date = May 1998 | pmid = 9565608 | doi = 10.1074/jbc.273.19.11839 }}</ref>
* [[PIAS1]],<ref name = pmid10380882 /><ref name = pmid11583632>{{cite journal | vauthors = Kahyo T, Nishida T, Yasuda H | title = Involvement of PIAS1 in the sumoylation of tumor suppressor p53 | journal = Molecular Cell | volume = 8 | issue = 3 | pages = 713–8 | date = September 2001 | pmid = 11583632 | doi = 10.1016/S1097-2765(01)00349-5 }}</ref>
* [[CDC14B]],<ref name = pmid10644693>{{cite journal | vauthors = Li L, Ljungman M, Dixon JE | title = The human Cdc14 phosphatases interact with and dephosphorylate the tumor suppressor protein p53 | journal = The Journal of Biological Chemistry | volume = 275 | issue = 4 | pages = 2410–4 | date = January 2000 | pmid = 10644693 | doi = 10.1074/jbc.275.4.2410 }}</ref>
* [[PIN1]],<ref name = pmid12388558>{{cite journal | vauthors = Wulf GM, Liou YC, Ryo A, Lee SW, Lu KP | title = Role of Pin1 in the regulation of p53 stability and p21 transactivation, and cell cycle checkpoints in response to DNA damage | journal = The Journal of Biological Chemistry | volume = 277 | issue = 50 | pages = 47976–9 | date = December 2002 | pmid = 12388558 | doi = 10.1074/jbc.C200538200 }}</ref><ref name = pmid12397362>{{cite journal | vauthors = Zacchi P, Gostissa M, Uchida T, Salvagno C, Avolio F, Volinia S, Ronai Z, Blandino G, Schneider C, Del Sal G | title = The prolyl isomerase Pin1 reveals a mechanism to control p53 functions after genotoxic insults | journal = Nature | volume = 419 | issue = 6909 | pages = 853–7 | date = October 2002 | pmid = 12397362 | doi = 10.1038/nature01120 }}</ref>
* [[PLAGL1]],<ref name = pmid11360197>{{cite journal | vauthors = Huang SM, Schönthal AH, Stallcup MR | title = Enhancement of p53-dependent gene activation by the transcriptional coactivator Zac1 | journal = Oncogene | volume = 20 | issue = 17 | pages = 2134–43 | date = April 2001 | pmid = 11360197 | doi = 10.1038/sj.onc.1204298 }}</ref>
* [[PLK3]],<ref name = pmid11551930>{{cite journal | vauthors = Xie S, Wu H, Wang Q, Cogswell JP, Husain I, Conn C, Stambrook P, Jhanwar-Uniyal M, Dai W | title = Plk3 functionally links DNA damage to cell cycle arrest and apoptosis at least in part via the p53 pathway | journal = The Journal of Biological Chemistry | volume = 276 | issue = 46 | pages = 43305–12 | date = November 2001 | pmid = 11551930 | doi = 10.1074/jbc.M106050200 }}</ref><ref name = pmid12242661>{{cite journal | vauthors = Bahassi EM, Conn CW, Myer DL, Hennigan RF, McGowan CH, Sanchez Y, Stambrook PJ | title = Mammalian Polo-like kinase 3 (Plk3) is a multifunctional protein involved in stress response pathways | journal = Oncogene | volume = 21 | issue = 43 | pages = 6633–40 | date = September 2002 | pmid = 12242661 | doi = 10.1038/sj.onc.1205850 }}</ref>
* [[PRKRA]],<ref name = pmid9010216>{{cite journal | vauthors = Simons A, Melamed-Bessudo C, Wolkowicz R, Sperling J, Sperling R, Eisenbach L, Rotter V | title = PACT: cloning and characterization of a cellular p53 binding protein that interacts with Rb | journal = Oncogene | volume = 14 | issue = 2 | pages = 145–55 | date = January 1997 | pmid = 9010216 | doi = 10.1038/sj.onc.1200825 }}</ref>
* [[Prohibitin|PHB]],<ref name = pmid14500729>{{cite journal | vauthors = Fusaro G, Dasgupta P, Rastogi S, Joshi B, Chellappan S | title = Prohibitin induces the transcriptional activity of p53 and is exported from the nucleus upon apoptotic signaling | journal = The Journal of Biological Chemistry | volume = 278 | issue = 48 | pages = 47853–61 | date = November 2003 | pmid = 14500729 | doi = 10.1074/jbc.M305171200 }}</ref>
* [[Promyelocytic leukemia protein|PML]],<ref name = pmid12915590>{{cite journal | vauthors = Kurki S, Latonen L, Laiho M | title = Cellular stress and DNA damage invoke temporally distinct Mdm2, p53 and PML complexes and damage-specific nuclear relocalization | journal = Journal of Cell Science | volume = 116 | issue = Pt 19 | pages = 3917–25 | date = October 2003 | pmid = 12915590 | doi = 10.1242/jcs.00714 }}</ref><ref name = pmid11080164>{{cite journal | vauthors = Fogal V, Gostissa M, Sandy P, Zacchi P, Sternsdorf T, Jensen K, Pandolfi PP, Will H, Schneider C, Del Sal G | title = Regulation of p53 activity in nuclear bodies by a specific PML isoform | journal = The EMBO Journal | volume = 19 | issue = 22 | pages = 6185–95 | date = November 2000 | pmid = 11080164 | pmc = 305840 | doi = 10.1093/emboj/19.22.6185 }}</ref><ref name = pmid11025664>{{cite journal | vauthors = Guo A, Salomoni P, Luo J, Shih A, Zhong S, Gu W, Pandolfi PP | title = The function of PML in p53-dependent apoptosis | journal = Nature Cell Biology | volume = 2 | issue = 10 | pages = 730–6 | date = October 2000 | pmid = 11025664 | doi = 10.1038/35036365 }}</ref>
* [[PSME3]],<ref name = pmid18309296>{{cite journal | vauthors = Zhang Z, Zhang R | title = Proteasome activator PA28 gamma regulates p53 by enhancing its MDM2-mediated degradation | journal = The EMBO Journal | volume = 27 | issue = 6 | pages = 852–64 | date = March 2008 | pmid = 18309296 | pmc = 2265109 | doi = 10.1038/emboj.2008.25 }}</ref>
* [[PTEN (gene)|PTEN]],<ref name = pmid12620407>{{cite journal | vauthors = Freeman DJ, Li AG, Wei G, Li HH, Kertesz N, Lesche R, Whale AD, Martinez-Diaz H, Rozengurt N, Cardiff RD, Liu X, Wu H | title = PTEN tumor suppressor regulates p53 protein levels and activity through phosphatase-dependent and -independent mechanisms | journal = Cancer Cell | volume = 3 | issue = 2 | pages = 117–30 | date = February 2003 | pmid = 12620407 | doi = 10.1016/S1535-6108(03)00021-7 }}</ref>
* [[PTK2]],<ref name = pmid18206965>{{cite journal | vauthors = Lim ST, Chen XL, Lim Y, Hanson DA, Vo TT, Howerton K, Larocque N, Fisher SJ, Schlaepfer DD, Ilic D | title = Nuclear FAK promotes cell proliferation and survival through FERM-enhanced p53 degradation | journal = Molecular Cell | volume = 29 | issue = 1 | pages = 9–22 | date = January 2008 | pmid = 18206965 | pmc = 2234035 | doi = 10.1016/j.molcel.2007.11.031 }}</ref>
* [[PTTG1]],<ref name = pmid12355087>{{cite journal | vauthors = Bernal JA, Luna R, Espina A, Lázaro I, Ramos-Morales F, Romero F, Arias C, Silva A, Tortolero M, Pintor-Toro JA | title = Human securin interacts with p53 and modulates p53-mediated transcriptional activity and apoptosis | journal = Nature Genetics | volume = 32 | issue = 2 | pages = 306–11 | date = October 2002 | pmid = 12355087 | doi = 10.1038/ng997 }}</ref>
* [[RAD51]],<ref name = pmid14636569 /><ref name = pmid8617246>{{cite journal | vauthors = Stürzbecher HW, Donzelmann B, Henning W, Knippschild U, Buchhop S | title = p53 is linked directly to homologous recombination processes via RAD51/RecA protein interaction | journal = The EMBO Journal | volume = 15 | issue = 8 | pages = 1992–2002 | date = April 1996 | pmid = 8617246 | pmc = 450118 | doi =  }}</ref><ref name = pmid9380510>{{cite journal | vauthors = Buchhop S, Gibson MK, Wang XW, Wagner P, Stürzbecher HW, Harris CC | title = Interaction of p53 with the human Rad51 protein | journal = Nucleic Acids Research | volume = 25 | issue = 19 | pages = 3868–74 | date = October 1997 | pmid = 9380510 | pmc = 146972 | doi = 10.1093/nar/25.19.3868 }}</ref>
* [[RCHY1]],<ref name = pmid12654245>{{cite journal | vauthors = Leng RP, Lin Y, Ma W, Wu H, Lemmers B, Chung S, Parant JM, Lozano G, Hakem R, Benchimol S | title = Pirh2, a p53-induced ubiquitin-protein ligase, promotes p53 degradation | journal = Cell | volume = 112 | issue = 6 | pages = 779–91 | date = March 2003 | pmid = 12654245 | doi = 10.1016/S0092-8674(03)00193-4 }}</ref><ref name = pmid19043414>{{cite journal | vauthors = Sheng Y, Laister RC, Lemak A, Wu B, Tai E, Duan S, Lukin J, Sunnerhagen M, Srisailam S, Karra M, Benchimol S, Arrowsmith CH | title = Molecular basis of Pirh2-mediated p53 ubiquitylation | journal = Nature Structural & Molecular Biology | volume = 15 | issue = 12 | pages = 1334–42 | date = December 2008 | pmid = 19043414 | pmc = 4075976 | doi = 10.1038/nsmb.1521 }}</ref>
* [[RELA]],<ref name=pmid20546595 />
* [[Reprimo]]<ref>citation needed</ref>
* [[Replication protein A1|RPA1]],<ref name = pmid15489903>{{cite journal | vauthors = Romanova LY, Willers H, Blagosklonny MV, Powell SN | title = The interaction of p53 with replication protein A mediates suppression of homologous recombination | journal = Oncogene | volume = 23 | issue = 56 | pages = 9025–33 | date = December 2004 | pmid = 15489903 | doi = 10.1038/sj.onc.1207982 }}</ref><ref name = pmid11751427>{{cite journal | vauthors = Riva F, Zuco V, Vink AA, Supino R, Prosperi E | title = UV-induced DNA incision and proliferating cell nuclear antigen recruitment to repair sites occur independently of p53-replication protein A interaction in p53 wild type and mutant ovarian carcinoma cells | journal = Carcinogenesis | volume = 22 | issue = 12 | pages = 1971–8 | date = December 2001 | pmid = 11751427 | doi = 10.1093/carcin/22.12.1971 }}</ref>
* [[RPL11]],<ref name = pmid14612427>{{cite journal | vauthors = Zhang Y, Wolf GW, Bhat K, Jin A, Allio T, Burkhart WA, Xiong Y | title = Ribosomal protein L11 negatively regulates oncoprotein MDM2 and mediates a p53-dependent ribosomal-stress checkpoint pathway | journal = Molecular and Cellular Biology | volume = 23 | issue = 23 | pages = 8902–12 | date = December 2003 | pmid = 14612427 | pmc = 262682 | doi = 10.1128/MCB.23.23.8902-8912.2003 }}</ref>
* [[S100B]],<ref name = pmid15178678>{{cite journal | vauthors = Lin J, Yang Q, Yan Z, Markowitz J, Wilder PT, Carrier F, Weber DJ | title = Inhibiting S100B restores p53 levels in primary malignant melanoma cancer cells | journal = The Journal of Biological Chemistry | volume = 279 | issue = 32 | pages = 34071–7 | date = August 2004 | pmid = 15178678 | doi = 10.1074/jbc.M405419200 }}</ref>
* [[Small ubiquitin-related modifier 1|SUMO1]],<ref name = pmid10961991>{{cite journal | vauthors = Minty A, Dumont X, Kaghad M, Caput D | title = Covalent modification of p73alpha by SUMO-1. Two-hybrid screening with p73 identifies novel SUMO-1-interacting proteins and a SUMO-1 interaction motif | journal = The Journal of Biological Chemistry | volume = 275 | issue = 46 | pages = 36316–23 | date = November 2000 | pmid = 10961991 | doi = 10.1074/jbc.M004293200 }}</ref><ref name = pmid18583933>{{cite journal | vauthors = Ivanchuk SM, Mondal S, Rutka JT | title = p14ARF interacts with DAXX: effects on HDM2 and p53 | journal = Cell Cycle | volume = 7 | issue = 12 | pages = 1836–50 | date = June 2008 | pmid = 18583933 | doi = 10.4161/cc.7.12.6025 }}</ref>
* [[SMARCA4]],<ref name = pmid11950834 />
* [[SMARCB1]],<ref name = pmid11950834>{{cite journal | vauthors = Lee D, Kim JW, Seo T, Hwang SG, Choi EJ, Choe J | title = SWI/SNF complex interacts with tumor suppressor p53 and is necessary for the activation of p53-mediated transcription | journal = The Journal of Biological Chemistry | volume = 277 | issue = 25 | pages = 22330–7 | date = June 2002 | pmid = 11950834 | doi = 10.1074/jbc.M111987200 }}</ref>
* [[SMN1]],<ref name = pmid11704667>{{cite journal | vauthors = Young PJ, Day PM, Zhou J, Androphy EJ, Morris GE, Lorson CL | title = A direct interaction between the survival motor neuron protein and p53 and its relationship to spinal muscular atrophy | journal = The Journal of Biological Chemistry | volume = 277 | issue = 4 | pages = 2852–9 | date = January 2002 | pmid = 11704667 | doi = 10.1074/jbc.M108769200 }}</ref>
* [[STAT3]],<ref name=pmid20546595>{{cite journal | vauthors = Choy MK, Movassagh M, Siggens L, Vujic A, Goddard M, Sánchez A, Perkins N, Figg N, Bennett M, Carroll J, Foo R | title = High-throughput sequencing identifies STAT3 as the DNA-associated factor for p53-NF-kappaB-complex-dependent gene expression in human heart failure | journal = Genome Medicine | volume = 2 | issue = 6 | pages = 37 | date = June 2010 | pmid = 20546595 | pmc = 2905097 | doi = 10.1186/gm158 }}</ref>
* [[TATA binding protein|TBP]],<ref name = pmid1465435>{{cite journal | vauthors = Seto E, Usheva A, Zambetti GP, Momand J, Horikoshi N, Weinmann R, Levine AJ, Shenk T | title = Wild-type p53 binds to the TATA-binding protein and represses transcription | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 89 | issue = 24 | pages = 12028–32 | date = December 1992 | pmid = 1465435 | pmc = 50691 | doi = 10.1073/pnas.89.24.12028 }}</ref><ref name = pmid10359315>{{cite journal | vauthors = Cvekl A, Kashanchi F, Brady JN, Piatigorsky J | title = Pax-6 interactions with TATA-box-binding protein and retinoblastoma protein | journal = Investigative Ophthalmology & Visual Science | volume = 40 | issue = 7 | pages = 1343–50 | date = June 1999 | pmid = 10359315 | doi =  }}</ref>
* [[TFAP2A]],<ref name = pmid12226108>{{cite journal | vauthors = McPherson LA, Loktev AV, Weigel RJ | title = Tumor suppressor activity of AP2alpha mediated through a direct interaction with p53 | journal = The Journal of Biological Chemistry | volume = 277 | issue = 47 | pages = 45028–33 | date = November 2002 | pmid = 12226108 | doi = 10.1074/jbc.M208924200 }}</ref>
* [[TFDP1]],<ref name = pmid8816502>{{cite journal | vauthors = Sørensen TS, Girling R, Lee CW, Gannon J, Bandara LR, La Thangue NB | title = Functional interaction between DP-1 and p53 | journal = Molecular and Cellular Biology | volume = 16 | issue = 10 | pages = 5888–95 | date = October 1996 | pmid = 8816502 | pmc = 231590 | doi = 10.1128/mcb.16.10.5888 }}</ref>
* [[C12orf5|TIGAR]],<ref name = pmid16839873>{{cite journal | vauthors = Green DR, Chipuk JE | title = p53 and metabolism: Inside the TIGAR | journal = Cell | volume = 126 | issue = 1 | pages = 30–2 | date = July 2006 | pmid = 16839873 | doi = 10.1016/j.cell.2006.06.032 }}</ref>
* [[TOP1]],<ref name = pmid10468612>{{cite journal | vauthors = Gobert C, Skladanowski A, Larsen AK | title = The interaction between p53 and DNA topoisomerase I is regulated differently in cells with wild-type and mutant p53 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 96 | issue = 18 | pages = 10355–60 | date = August 1999 | pmid = 10468612 | pmc = 17892 | doi = 10.1073/pnas.96.18.10355 }}</ref><ref name = pmid11805286>{{cite journal | vauthors = Mao Y, Mehl IR, Muller MT | title = Subnuclear distribution of topoisomerase I is linked to ongoing transcription and p53 status | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 99 | issue = 3 | pages = 1235–40 | date = February 2002 | pmid = 11805286 | pmc = 122173 | doi = 10.1073/pnas.022631899 }}</ref>
* [[TOP2A]],<ref name = pmid10666337 />
* [[TP53BP1]],<ref name = pmid15364958 /><ref name = pmid12110597>{{cite journal | vauthors = Derbyshire DJ, Basu BP, Serpell LC, Joo WS, Date T, Iwabuchi K, Doherty AJ | title = Crystal structure of human 53BP1 BRCT domains bound to p53 tumour suppressor | journal = The EMBO Journal | volume = 21 | issue = 14 | pages = 3863–72 | date = July 2002 | pmid = 12110597 | pmc = 126127 | doi = 10.1093/emboj/cdf383 }}</ref><ref name = pmid14978302>{{cite journal | vauthors = Ekblad CM, Friedler A, Veprintsev D, Weinberg RL, Itzhaki LS | title = Comparison of BRCT domains of BRCA1 and 53BP1: a biophysical analysis | journal = Protein Science | volume = 13 | issue = 3 | pages = 617–25 | date = March 2004 | pmid = 14978302 | pmc = 2286730 | doi = 10.1110/ps.03461404 }}</ref><ref name = pmid15611139>{{cite journal | vauthors = Lo KW, Kan HM, Chan LN, Xu WG, Wang KP, Wu Z, Sheng M, Zhang M | title = The 8-kDa dynein light chain binds to p53-binding protein 1 and mediates DNA damage-induced p53 nuclear accumulation | journal = The Journal of Biological Chemistry | volume = 280 | issue = 9 | pages = 8172–9 | date = March 2005 | pmid = 15611139 | doi = 10.1074/jbc.M411408200 }}</ref><ref name = pmid11877378>{{cite journal | vauthors = Joo WS, Jeffrey PD, Cantor SB, Finnin MS, Livingston DM, Pavletich NP | title = Structure of the 53BP1 BRCT region bound to p53 and its comparison to the Brca1 BRCT structure | journal = Genes & Development | volume = 16 | issue = 5 | pages = 583–93 | date = March 2002 | pmid = 11877378 | pmc = 155350 | doi = 10.1101/gad.959202 }}</ref><ref name = pmid12351827>{{cite journal | vauthors = Derbyshire DJ, Basu BP, Date T, Iwabuchi K, Doherty AJ | title = Purification, crystallization and preliminary X-ray analysis of the BRCT domains of human 53BP1 bound to the p53 tumour suppressor | journal = Acta Crystallographica D | volume = 58 | issue = Pt 10 Pt 2 | pages = 1826–9 | date = October 2002 | pmid = 12351827 | doi = 10.1107/S0907444902010910 }}</ref><ref name = pmid8016121 />
* [[TP53BP2]],<ref name = pmid8016121>{{cite journal | vauthors = Iwabuchi K, Bartel PL, Li B, Marraccino R, Fields S | title = Two cellular proteins that bind to wild-type but not mutant p53 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 91 | issue = 13 | pages = 6098–102 | date = June 1994 | pmid = 8016121 | pmc = 44145 | doi = 10.1073/pnas.91.13.6098 }}</ref><ref name = pmid8668206>{{cite journal | vauthors = Naumovski L, Cleary ML | title = The p53-binding protein 53BP2 also interacts with Bc12 and impedes cell cycle progression at G2/M | journal = Molecular and Cellular Biology | volume = 16 | issue = 7 | pages = 3884–92 | date = July 1996 | pmid = 8668206 | pmc = 231385 | doi =  }}</ref>
* [[TOP2B]],<ref name = pmid10666337>{{cite journal | vauthors = Cowell IG, Okorokov AL, Cutts SA, Padget K, Bell M, Milner J, Austin CA | title = Human topoisomerase IIalpha and IIbeta interact with the C-terminal region of p53 | journal = Experimental Cell Research | volume = 255 | issue = 1 | pages = 86–94 | date = February 2000 | pmid = 10666337 | doi = 10.1006/excr.1999.4772 }}</ref>
* [[TP53INP1]],<ref name = pmid12851404>{{cite journal | vauthors = Tomasini R, Samir AA, Carrier A, Isnardon D, Cecchinelli B, Soddu S, Malissen B, Dagorn JC, Iovanna JL, Dusetti NJ | title = TP53INP1s and homeodomain-interacting protein kinase-2 (HIPK2) are partners in regulating p53 activity | journal = The Journal of Biological Chemistry | volume = 278 | issue = 39 | pages = 37722–9 | date = September 2003 | pmid = 12851404 | doi = 10.1074/jbc.M301979200 }}</ref><ref name = pmid11511362>{{cite journal | vauthors = Okamura S, Arakawa H, Tanaka T, Nakanishi H, Ng CC, Taya Y, Monden M, Nakamura Y | title = p53DINP1, a p53-inducible gene, regulates p53-dependent apoptosis | journal = Molecular Cell | volume = 8 | issue = 1 | pages = 85–94 | date = July 2001 | pmid = 11511362 | doi = 10.1016/S1097-2765(01)00284-2 }}</ref>
* [[TSG101]],<ref name = pmid11172000>{{cite journal | vauthors = Li L, Liao J, Ruland J, Mak TW, Cohen SN | title = A TSG101/MDM2 regulatory loop modulates MDM2 degradation and MDM2/p53 feedback control | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 98 | issue = 4 | pages = 1619–24 | date = February 2001 | pmid = 11172000 | pmc = 29306 | doi = 10.1073/pnas.98.4.1619 }}</ref>
* [[UBE2A]],<ref name = pmid12640129>{{cite journal | vauthors = Lyakhovich A, Shekhar MP | title = Supramolecular complex formation between Rad6 and proteins of the p53 pathway during DNA damage-induced response | journal = Molecular and Cellular Biology | volume = 23 | issue = 7 | pages = 2463–75 | date = April 2003 | pmid = 12640129 | pmc = 150718 | doi = 10.1128/MCB.23.7.2463-2475.2003 }}</ref>
* [[UBE2I]],<ref name = pmid10380882 /><ref name = pmid10961991 /><ref name = pmid8921390>{{cite journal | vauthors = Shen Z, Pardington-Purtymun PE, Comeaux JC, Moyzis RK, Chen DJ | title = Associations of UBE2I with RAD52, UBL1, p53, and RAD51 proteins in a yeast two-hybrid system | journal = Genomics | volume = 37 | issue = 2 | pages = 183–6 | date = October 1996 | pmid = 8921390 | doi = 10.1006/geno.1996.0540 }}</ref><ref name = pmid11853669>{{cite journal | vauthors = Bernier-Villamor V, Sampson DA, Matunis MJ, Lima CD | title = Structural basis for E2-mediated SUMO conjugation revealed by a complex between ubiquitin-conjugating enzyme Ubc9 and RanGAP1 | journal = Cell | volume = 108 | issue = 3 | pages = 345–56 | date = February 2002 | pmid = 11853669 | doi = 10.1016/S0092-8674(02)00630-X }}</ref>
* [[Ubiquitin C|UBC]],<ref name = pmid18695251 /><ref name = pmid18309296 /><ref name = pmid18583933 /><ref name = pmid18632619>{{cite journal | vauthors = Sehat B, Andersson S, Girnita L, Larsson O | title = Identification of c-Cbl as a new ligase for insulin-like growth factor-I receptor with distinct roles from Mdm2 in receptor ubiquitination and endocytosis | journal = Cancer Research | volume = 68 | issue = 14 | pages = 5669–77 | date = July 2008 | pmid = 18632619 | doi = 10.1158/0008-5472.CAN-07-6364 }}</ref><ref name = pmid18566590>{{cite journal | vauthors = Song MS, Song SJ, Kim SY, Oh HJ, Lim DS | title = The tumour suppressor RASSF1A promotes MDM2 self-ubiquitination by disrupting the MDM2-DAXX-HAUSP complex | journal = The EMBO Journal | volume = 27 | issue = 13 | pages = 1863–74 | date = July 2008 | pmid = 18566590 | pmc = 2486425 | doi = 10.1038/emboj.2008.115 }}</ref><ref name = pmid18382127>{{cite journal | vauthors = Yang W, Dicker DT, Chen J, El-Deiry WS | title = CARPs enhance p53 turnover by degrading 14-3-3sigma and stabilizing MDM2 | journal = Cell Cycle | volume = 7 | issue = 5 | pages = 670–82 | date = March 2008 | pmid = 18382127 | doi = 10.4161/cc.7.5.5701 }}</ref><ref name = pmid18359851>{{cite journal | vauthors = Abe Y, Oda-Sato E, Tobiume K, Kawauchi K, Taya Y, Okamoto K, Oren M, Tanaka N | title = Hedgehog signaling overrides p53-mediated tumor suppression by activating Mdm2 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 105 | issue = 12 | pages = 4838–43 | date = March 2008 | pmid = 18359851 | pmc = 2290789 | doi = 10.1073/pnas.0712216105 }}</ref><ref name = pmid18264029>{{cite journal | vauthors = Dohmesen C, Koeppel M, Dobbelstein M | title = Specific inhibition of Mdm2-mediated neddylation by Tip60 | journal = Cell Cycle | volume = 7 | issue = 2 | pages = 222–31 | date = January 2008 | pmid = 18264029 | doi = 10.4161/cc.7.2.5185 }}</ref>
* [[USP7]],<ref name = pmid11923872>{{cite journal | vauthors = Li M, Chen D, Shiloh A, Luo J, Nikolaev AY, Qin J, Gu W | title = Deubiquitination of p53 by HAUSP is an important pathway for p53 stabilization | journal = Nature | volume = 416 | issue = 6881 | pages = 648–53 | date = April 2002 | pmid = 11923872 | doi = 10.1038/nature737 }}</ref>
* [[Werner syndrome ATP-dependent helicase|WRN]],<ref name = pmid12080066>{{cite journal | vauthors = Yang Q, Zhang R, Wang XW, Spillare EA, Linke SP, Subramanian D, Griffith JD, Li JL, Hickson ID, Shen JC, Loeb LA, Mazur SJ, Appella E, Brosh RM, Karmakar P, Bohr VA, Harris CC | title = The processing of Holliday junctions by BLM and WRN helicases is regulated by p53 | journal = The Journal of Biological Chemistry | volume = 277 | issue = 35 | pages = 31980–7 | date = August 2002 | pmid = 12080066 | doi = 10.1074/jbc.M204111200 }}</ref><ref name = pmid11427532>{{cite journal | vauthors = Brosh RM, Karmakar P, Sommers JA, Yang Q, Wang XW, Spillare EA, Harris CC, Bohr VA | title = p53 Modulates the exonuclease activity of Werner syndrome protein | journal = The Journal of Biological Chemistry | volume = 276 | issue = 37 | pages = 35093–102 | date = September 2001 | pmid = 11427532 | doi = 10.1074/jbc.M103332200 }}</ref>
* [[WWOX]],<ref name = pmid11058590>{{cite journal | vauthors = Chang NS, Pratt N, Heath J, Schultz L, Sleve D, Carey GB, Zevotek N | title = Hyaluronidase induction of a WW domain-containing oxidoreductase that enhances tumor necrosis factor cytotoxicity | journal = The Journal of Biological Chemistry | volume = 276 | issue = 5 | pages = 3361–70 | date = February 2001 | pmid = 11058590 | doi = 10.1074/jbc.M007140200 }}</ref>
* [[XPB]],<ref name = pmid7663514 />
* [[Y box binding protein 1|YBX1]],<ref name = pmid15136035>{{cite journal | vauthors = Kojic S, Medeot E, Guccione E, Krmac H, Zara I, Martinelli V, Valle G, Faulkner G | title = The Ankrd2 protein, a link between the sarcomere and the nucleus in skeletal muscle | journal = Journal of Molecular Biology | volume = 339 | issue = 2 | pages = 313–25 | date = May 2004 | pmid = 15136035 | doi = 10.1016/j.jmb.2004.03.071 }}</ref><ref name = pmid11175333>{{cite journal | vauthors = Okamoto T, Izumi H, Imamura T, Takano H, Ise T, Uchiumi T, Kuwano M, Kohno K | title = Direct interaction of p53 with the Y-box binding protein, YB-1: a mechanism for regulation of human gene expression | journal = Oncogene | volume = 19 | issue = 54 | pages = 6194–202 | date = December 2000 | pmid = 11175333 | doi = 10.1038/sj.onc.1204029 }}</ref>
* [[YPEL3]],<ref name= pmid20388804>{{cite journal | vauthors = Kelley KD, Miller KR, Todd A, Kelley AR, Tuttle R, Berberich SJ | title = YPEL3, a p53-regulated gene that induces cellular senescence | journal = Cancer Research | volume = 70 | issue = 9 | pages = 3566–75 | date = May 2010 | pmid = 20388804 | pmc = 2862112 | doi = 10.1158/0008-5472.CAN-09-3219 }}</ref>
* [[YWHAZ]],<ref name = pmid9620776>{{cite journal | vauthors = Waterman MJ, Stavridi ES, Waterman JL, Halazonetis TD | title = ATM-dependent activation of p53 involves dephosphorylation and association with 14-3-3 proteins | journal = Nature Genetics | volume = 19 | issue = 2 | pages = 175–8 | date = June 1998 | pmid = 9620776 | doi = 10.1038/542 }}</ref>
* [[Zif268]],<ref name = pmid11251186>{{cite journal | vauthors = Liu J, Grogan L, Nau MM, Allegra CJ, Chu E, Wright JJ | title = Physical interaction between p53 and primary response gene Egr-1 | journal = International Journal of Oncology | volume = 18 | issue = 4 | pages = 863–70 | date = April 2001 | pmid = 11251186 | doi = 10.3892/ijo.18.4.863 }}</ref>
* [[ZNF148]].<ref name = pmid11416144>{{cite journal | vauthors = Bai L, Merchant JL | title = ZBP-89 promotes growth arrest through stabilization of p53 | journal = Molecular and Cellular Biology | volume = 21 | issue = 14 | pages = 4670–83 | date = July 2001 | pmid = 11416144 | pmc = 87140 | doi = 10.1128/MCB.21.14.4670-4683.2001 }}</ref>
* [[SIRT1]].<ref name = pmid19221490 >{{cite journal | vauthors = Yamakuchi M, Lowenstein CJ | title = MiR-34, SIRT1 and p53: the feedback loop | journal = Cell Cycle | volume = 8 | issue = 5 | pages = 712–5 | date = March 2009 | pmid = 19221490 | doi = 10.4161/cc.8.5.7753 }}</ref>
{{div col end}}
==See also==
*[[Pifithrin]], an inhibitor of P53

== References ==
{{reflist|35em}}

== External links ==
{{Commons category|Tumor suppressor protein p53}}
* {{vcite web|url=http://p53.bii.a-star.edu.sg/|title=p53 Knowledgebase|access-date=2008-04-06 | publisher=Lane Group at the Institute of Molecular and Cell Biology (IMCB), Singapore|pages=| language=| archive-url=https://web.archive.org/web/20060103170051/http://p53.bii.a-star.edu.sg/| archive-date=2006-01-03|dead-url=yes| quote=}}
* [https://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=gene&part=li-fraumeni GeneReviews/NCBI/NIH/UW entry on Li-Fraumeni Syndrome]
* [https://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=191170 TUMOR PROTEIN p53] @ [[OMIM]]
* [http://www.news-medical.net/news/20130708/p53-restoration-of-function-drug-candidate-an-interview-with-Dr-Wayne-Danter-MD-FRCPC-President-and-CEO-of-Critical-Outcome-Technologies.aspx p53 restoration of function]
* [http://atlasgeneticsoncology.org/Genes/P53ID88.html p53] @ The Atlas of Genetics and Cytogenetics in Oncology and Haematology
* [https://www.genecards.org/cgi-bin/carddisp.pl?gene=tp53 TP53 Gene] @ GeneCards
* [https://web.archive.org/web/20101124135159/http://insciences.org/articles.php?tag=p53 p53 News] provided by insciences organisation
* {{vcite web|url=http://www.pdb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb31_2.html|title= p53 Tumor Suppressor|access-date=2008-04-06|author=David S. Goodsel l date=2002-07-01| work=Molecule of the Month|publisher=RCSB Protein Data Bank|pages=| language=| quote=}}
* {{vcite web|url=http://p53.free.fr/|title=p53 Web Site|access-date=2008-04-06|author=Thierry Soussi| work=| publisher=| pages=| language=| quote=}}
* [http://www.tp53.co.uk/ The George Pantziarka TP53 Trust] A support group from the UK for sufferers of Li-Fraumeni Syndrome or other TP53-related disorders
* [http://www-p53.iarc.fr/ IARC TP53 Somatic Mutations database] maintained at IARC, Lyon, by Magali Olivier

{{PDB Gallery|geneid=7157}}
{{Transcription factors|g4}}
{{Tumor suppressor genes and oncogenes}}
{{Cell cycle proteins}}

[[Category:Programmed cell death]]
[[Category:Proteins]]
[[Category:Transcription factors]]
[[Category:Tumor suppressor genes]]
[[Category:Apoptosis]]
[[Category:Genes mutated in mice]]
[[Category:Aging-related proteins]]