RING-box protein 2 is a protein that in humans is encoded by the RNF7gene.[1][2][3]
The protein encoded by this gene is a highly conserved ring finger protein. It is an essential subunit of SKP1-cullin/CDC53-F box protein ubiquitin ligases, which are a part of the protein degradation machinery important for cell cycle progression and signal transduction. This protein interacts with, and is a substrate of, casein kinase II (CSNK2A1/CKII). The phosphorylation of this protein by CSNK2A1 has been shown to promote the degradation of IkappaBalpha (CHUK/IKK-alpha/IKBKA) and p27Kip1(CDKN1B). Alternatively spliced transcript variants encoding distinct isoforms have been reported.[3]
↑Ohta T, Michel JJ, Schottelius AJ, Xiong Y (May 1999). "ROC1, a homolog of APC11, represents a family of cullin partners with an associated ubiquitin ligase activity". Mol Cell. 3 (4): 535–41. doi:10.1016/S1097-2765(00)80482-7. PMID10230407.
↑Ahn, B H; Kim T H; Bae Y S (October 2001). "Mapping of the interaction domain of the protein kinase CKII beta subunit with target proteins". Mol. Cells. Korea (South). 12 (2): 158–63. ISSN1016-8478. PMID11710515.
Further reading
Tan P, Fuchs SY, Chen A, et al. (1999). "Recruitment of a ROC1-CUL1 ubiquitin ligase by Skp1 and HOS to catalyze the ubiquitination of I kappa B alpha". Mol. Cell. 3 (4): 527–33. doi:10.1016/S1097-2765(00)80481-5. PMID10230406.
Swaroop M, Bian J, Aviram M, et al. (1999). "Expression, purification, and biochemical characterization of SAG, a ring finger redox-sensitive protein". Free Radic. Biol. Med. 27 (1–2): 193–202. doi:10.1016/S0891-5849(99)00078-7. PMID10443936.
Sun Y (1999). "Alterations of SAG mRNA in human cancer cell lines: requirement for the RING finger domain for apoptosis protection". Carcinogenesis. 20 (10): 1899–903. doi:10.1093/carcin/20.10.1899. PMID10506102.
Son MY, Park JW, Kim YS, et al. (1999). "Protein kinase CKII interacts with and phosphorylates the SAG protein containing ring-H2 finger motif". Biochem. Biophys. Res. Commun. 263 (3): 743–8. doi:10.1006/bbrc.1999.1460. PMID10512750.
Chen A, Wu K, Fuchs SY, et al. (2000). "The conserved RING-H2 finger of ROC1 is required for ubiquitin ligation". J. Biol. Chem. 275 (20): 15432–9. doi:10.1074/jbc.M907300199. PMID10748083.
Swaroop M, Wang Y, Miller P, et al. (2000). "Yeast homolog of human SAG/ROC2/Rbx2/Hrt2 is essential for cell growth, but not for germination: chip profiling implicates its role in cell cycle regulation". Oncogene. 19 (24): 2855–66. doi:10.1038/sj.onc.1203635. PMID10851089.
Duan H, Tsvetkov LM, Liu Y, et al. (2001). "Promotion of S-phase entry and cell growth under serum starvation by SAG/ROC2/Rbx2/Hrt2, an E3 ubiquitin ligase component: association with inhibition of p27 accumulation". Mol. Carcinog. 30 (1): 37–46. doi:10.1002/1098-2744(200101)30:1<37::AID-MC1011>3.0.CO;2-7. PMID11255262.
Ahn BH, Kim TH, Bae YS (2002). "Mapping of the interaction domain of the protein kinase CKII beta subunit with target proteins". Mol. Cells. 12 (2): 158–63. PMID11710515.
Furukawa M, Ohta T, Xiong Y (2002). "Activation of UBC5 ubiquitin-conjugating enzyme by the RING finger of ROC1 and assembly of active ubiquitin ligases by all cullins". J. Biol. Chem. 277 (18): 15758–65. doi:10.1074/jbc.M108565200. PMID11861641.
Kim SY, Bae YS, Park JW (2002). "Thiol-linked peroxidase activity of human sensitive to apoptosis gene (SAG) protein". Free Radic. Res. 36 (1): 73–8. doi:10.1080/10715760210164. PMID11999705.
Kim YS, Ha KS, Kim YH, Bae YS (2003). "The Ring-H2 finger motif of CKBBP1/SAG is necessary for interaction with protein kinase CKII and optimal cell proliferation". J. Biochem. Mol. Biol. 35 (6): 629–36. doi:10.5483/bmbrep.2002.35.6.629. PMID12470599.
Kim SY, Lee JH, Yang ES, et al. (2003). "Human sensitive to apoptosis gene protein inhibits peroxynitrite-induced DNA damage". Biochem. Biophys. Res. Commun. 301 (3): 671–4. doi:10.1016/S0006-291X(03)00018-4. PMID12565832.
Kim YS, Lee JY, Son MY, et al. (2003). "Phosphorylation of threonine 10 on CKBBP1/SAG/ROC2/Rbx2 by protein kinase CKII promotes the degradation of IkappaBalpha and p27Kip1". J. Biol. Chem. 278 (31): 28462–9. doi:10.1074/jbc.M302584200. PMID12748192.