UPF3B

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Identifiers
Aliases
External IDs	GeneCards: [1]
Orthologs
Species	Human	Mouse
Entrez	n/a	n/a
Ensembl	n/a	n/a
UniProt	n/a	n/a
RefSeq (mRNA)	n/a	n/a
RefSeq (protein)	n/a	n/a
Location (UCSC)	n/a	n/a
PubMed search	n/a	n/a
Wikidata
View/Edit Human

Regulator of nonsense transcripts 3B is a protein that in humans is encoded by the UPF3B gene.

This gene encodes a protein that is part of a post-splicing multiprotein complex involved in both mRNA nuclear export and mRNA surveillance. The encoded protein is one of two functional homologs to yeast Upf3p. mRNA surveillance detects exported mRNAs with truncated open reading frames and initiates nonsense-mediated mRNA decay (NMD). When translation ends upstream from the last exon-exon junction, this triggers NMD to degrade mRNAs containing premature stop codons. This protein binds to the mRNA and remains bound after nuclear export, acting as a nucleocytoplasmic shuttling protein. It forms with Y14 a complex that binds specifically 20 nt upstream of exon-exon junctions. This gene is located on the long arm of chromosome X. Two splice variants encoding different isoforms have been found for this gene.

Interactions

UPF3B has been shown to interact with UPF2 and UPF1.

Further reading

• Cross SH, Charlton JA, Nan X, Bird AP (1994). "Purification of CpG islands using a methylated DNA binding column". Nat. Genet. 6 (3): 236–44. doi:10.1038/ng0394-236. PMID 8012384.
• Wilson KF, Fortes P, Singh US, et al. (1999). "The nuclear cap-binding complex is a novel target of growth factor receptor-coupled signal transduction". J. Biol. Chem. 274 (7): 4166–73. doi:10.1074/jbc.274.7.4166. PMID 9933612.
• Kim VN, Kataoka N, Dreyfuss G (2001). "Role of the nonsense-mediated decay factor hUpf3 in the splicing-dependent exon-exon junction complex". Science. 293 (5536): 1832–6. doi:10.1126/science.1062829. PMID 11546873.
• Lykke-Andersen J, Shu MD, Steitz JA (2001). "Communication of the position of exon-exon junctions to the mRNA surveillance machinery by the protein RNPS1". Science. 293 (5536): 1836–9. doi:10.1126/science.1062786. PMID 11546874.
• Lejeune F, Ishigaki Y, Li X, Maquat LE (2002). "The exon junction complex is detected on CBP80-bound but not eIF4E-bound mRNA in mammalian cells: dynamics of mRNP remodeling". EMBO J. 21 (13): 3536–45. doi:10.1093/emboj/cdf345. PMC 126094. PMID 12093754.
• Lykke-Andersen J (2003). "Identification of a human decapping complex associated with hUpf proteins in nonsense-mediated decay". Mol. Cell. Biol. 22 (23): 8114–21. doi:10.1128/MCB.22.23.8114-8121.2002. PMC 134073. PMID 12417715.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Chiu SY, Serin G, Ohara O, Maquat LE (2003). "Characterization of human Smg5/7a: a protein with similarities to Caenorhabditis elegans SMG5 and SMG7 that functions in the dephosphorylation of Upf1". RNA. 9 (1): 77–87. doi:10.1261/rna.2137903. PMC 1370372. PMID 12554878.
• Gehring NH, Neu-Yilik G, Schell T, et al. (2003). "Y14 and hUpf3b form an NMD-activating complex". Mol. Cell. 11 (4): 939–49. doi:10.1016/S1097-2765(03)00142-4. PMID 12718880.
• Schell T, Köcher T, Wilm M, et al. (2003). "Complexes between the nonsense-mediated mRNA decay pathway factor human upf1 (up-frameshift protein 1) and essential nonsense-mediated mRNA decay factors in HeLa cells". Biochem. J. 373 (Pt 3): 775–83. doi:10.1042/BJ20021920. PMC 1223536. PMID 12723973.
• Lejeune F, Li X, Maquat LE (2003). "Nonsense-mediated mRNA decay in mammalian cells involves decapping, deadenylating, and exonucleolytic activities". Mol. Cell. 12 (3): 675–87. doi:10.1016/S1097-2765(03)00349-6. PMID 14527413.
• Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID 14702039.
• Kadlec J, Izaurralde E, Cusack S (2004). "The structural basis for the interaction between nonsense-mediated mRNA decay factors UPF2 and UPF3". Nat. Struct. Mol. Biol. 11 (4): 330–7. doi:10.1038/nsmb741. PMID 15004547.
• Lehner B, Sanderson CM (2004). "A protein interaction framework for human mRNA degradation". Genome Res. 14 (7): 1315–23. doi:10.1101/gr.2122004. PMC 442147. PMID 15231747.
• Andersen JS, Lam YW, Leung AK, et al. (2005). "Nucleolar proteome dynamics". Nature. 433 (7021): 77–83. doi:10.1038/nature03207. PMID 15635413.
• Kim YK, Furic L, Desgroseillers L, Maquat LE (2005). "Mammalian Staufen1 recruits Upf1 to specific mRNA 3'UTRs so as to elicit mRNA decay". Cell. 120 (2): 195–208. doi:10.1016/j.cell.2004.11.050. PMID 15680326.
• Gehring NH, Kunz JB, Neu-Yilik G, et al. (2005). "Exon-junction complex components specify distinct routes of nonsense-mediated mRNA decay with differential cofactor requirements". Mol. Cell. 20 (1): 65–75. doi:10.1016/j.molcel.2005.08.012. PMID 16209946.
• Kunz JB, Neu-Yilik G, Hentze MW, et al. (2006). "Functions of hUpf3a and hUpf3b in nonsense-mediated mRNA decay and translation". RNA. 12 (6): 1015–22. doi:10.1261/rna.12506. PMC 1464862. PMID 16601204.