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.[7]
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.
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.
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. S2CID12999764.
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.