E3 ubiquitin-protein ligase RAD18 is an enzyme that in humans is encoded by the RAD18gene.[5][6][7] A knockout in a human colorectal cancer cell line, HCT116, has also been created.[8]
Function
The protein encoded by this gene is highly similar to S. cerevisiae DNA damage repair protein Rad18. Yeast Rad18 functions through interaction with Rad6, which is a ubiquitin-conjugating enzyme required for post-replication repair of damaged DNA. Similar to its yeast counterpart, this protein is able to interact with the human homolog of yeast Rad6 protein through a conserved ring finger motif. Mutation of this motif results in defective replication of UV-damaged DNA and hypersensitivity to multiple mutagens.[7]
RAD18 is an E3 ubiquitin ligase that enables movement of ubiquitin from a ubiquitin carrier to another protein (the substrate). One activity of RAD18 is to prevent replication fork collapse by promoting DNA translesion synthesis and template switching.[9] RAD18 is also involved in directing repair of DNA double-strand breaks by homologous recombination in post replicative chromatin.[9] RAD18 appears to promote homologous recombinational repair by recruiting the SMC5,SMC6 (SMC5/6) complex to the DNA breaks.[9]
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Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (October 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.
Nikiforov A, Svetlova M, Solovjeva L, Sasina L, Siino J, Nazarov I, Bradbury M, Tomilin N (October 2004). "DNA damage-induced accumulation of Rad18 protein at stalled replication forks in mammalian cells involves upstream protein phosphorylation". Biochemical and Biophysical Research Communications. 323 (3): 831–7. Bibcode:2004BBRC..323..831N. doi:10.1016/j.bbrc.2004.08.165. PMID15381075.
Beausoleil SA, Villén J, Gerber SA, Rush J, Gygi SP (October 2006). "A probability-based approach for high-throughput protein phosphorylation analysis and site localization". Nature Biotechnology. 24 (10): 1285–92. doi:10.1038/nbt1240. PMID16964243. S2CID14294292.
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