RAD18

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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
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Wikidata
View/Edit Human

E3 ubiquitin-protein ligase RAD18 is an enzyme that in humans is encoded by the RAD18 gene.

Function

The protein encoded by this gene is highly similar to S. cerevisiae DNA damage repair protein Rad18. Yeast Rad18 functions through its 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.

Animal models

Model organisms have been used in the study of RAD18 function. A conditional knockout mouse line, called Rad18^{tm1a(EUCOMM)Wtsi}, was generated as part of the EUCOMM program — a high-throughput mutagenesis project to generate and distribute animal models of disease to interested scientists — at the Wellcome Trust Sanger Institute. Mice lacking Rad18 had no significant defects in viability or fertility, therefore male and female animals underwent a standardized phenotypic screen to determine the effects of deletion.

Rad18 knockout mouse phenotype

Characteristic	Phenotype
Homozygote viability	Normal
Fertility	Normal
Body weight	Abnormal
Anxiety	Normal
Neurological assessment	Normal
Grip strength	Normal
Hot plate	Normal
Dysmorphology	Normal
Indirect calorimetry	Abnormal
Glucose tolerance test	Normal
Auditory brainstem response	Normal
DEXA	Abnormal
Radiography	Normal
Body temperature	Normal
Eye morphology	Normal
Clinical chemistry	Normal
Plasma immunoglobulins	Normal
Haematology	Normal
Peripheral blood lymphocytes	Normal
Micronucleus test	Abnormal
Heart weight	Normal
Tail epidermis wholemount	Normal
Skin Histopathology	Normal
Salmonella infection	Normal
Citrobacter infection	Normal
All tests and analysis from

Twenty five tests were carried out and four significant phenotypes were reported:

• Mutant male mice had a decreased body weight compared to wildtype control mice.
• Mutant male mice showed increased activity, VO2 and energy expenditure, determined by indirect calorimetry.
• Dual-energy X-ray absorptiometry (DEXA) showed mutant male mice had a decrease in fat mass.
• A micronucleus test found a potential increase in DNA damage in mutant mice.

A knockout in a human colorectal cancer cell line, HCT116, has also been created.

Interactions

RAD18 has been shown to interact with HLTF, UBE2B and UBE2A.

Further reading

• Maruyama K, Sugano S (January 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298.
• 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. PMID 9373149.
• Mulder LC, Chakrabarti LA, Muesing MA (July 2002). "Interaction of HIV-1 integrase with DNA repair protein hRad18". The Journal of Biological Chemistry. 277 (30): 27489–93. doi:10.1074/jbc.M203061200. PMID 12016221.
• Nikiforov AA, Sasina LK, Svetlova MP, Solovjeva LV, Oei SL, Bradbury EM, Tomilin NV (2004). "Early immobilization of nuclease FEN1 and accumulation of hRAD18 protein at stalled DNA replication forks in mammalian cells". Doklady Biochemistry and Biophysics. 389: 122–5. doi:10.1023/A:1023696425171. PMID 12856420.
• Beausoleil SA, Jedrychowski M, Schwartz D, Elias JE, Villén J, Li J, Cohn MA, Cantley LC, Gygi SP (August 2004). "Large-scale characterization of HeLa cell nuclear phosphoproteins". Proceedings of the National Academy of Sciences of the United States of America. 101 (33): 12130–5. doi:10.1073/pnas.0404720101. PMC 514446. PMID 15302935.
• Watanabe K, Tateishi S, Kawasuji M, Tsurimoto T, Inoue H, Yamaizumi M (October 2004). "Rad18 guides poleta to replication stalling sites through physical interaction and PCNA monoubiquitination". The EMBO Journal. 23 (19): 3886–96. doi:10.1038/sj.emboj.7600383. PMC 522788. PMID 15359278.
• 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. doi:10.1016/j.bbrc.2004.08.165. PMID 15381075.
• Miyase S, Tateishi S, Watanabe K, Tomita K, Suzuki K, Inoue H, Yamaizumi M (January 2005). "Differential regulation of Rad18 through Rad6-dependent mono- and polyubiquitination". The Journal of Biological Chemistry. 280 (1): 515–24. doi:10.1074/jbc.M409219200. PMID 15509568.
• Masuyama S, Tateishi S, Yomogida K, Nishimune Y, Suzuki K, Sakuraba Y, Inoue H, Ogawa M, Yamaizumi M (August 2005). "Regulated expression and dynamic changes in subnuclear localization of mammalian Rad18 under normal and genotoxic conditions". Genes to Cells. 10 (8): 753–62. doi:10.1111/j.1365-2443.2005.00874.x. PMID 16098139.
• Nousiainen M, Silljé HH, Sauer G, Nigg EA, Körner R (April 2006). "Phosphoproteome analysis of the human mitotic spindle". Proceedings of the National Academy of Sciences of the United States of America. 103 (14): 5391–6. doi:10.1073/pnas.0507066103. PMC 1459365. PMID 16565220.
• Bi X, Barkley LR, Slater DM, Tateishi S, Yamaizumi M, Ohmori H, Vaziri C (May 2006). "Rad18 regulates DNA polymerase kappa and is required for recovery from S-phase checkpoint-mediated arrest". Molecular and Cellular Biology. 26 (9): 3527–40. doi:10.1128/MCB.26.9.3527-3540.2006. PMC 1447421. PMID 16611994.
• Lloyd AG, Tateishi S, Bieniasz PD, Muesing MA, Yamaizumi M, Mulder LC (May 2006). "Effect of DNA repair protein Rad18 on viral infection". PLoS Pathogens. 2 (5): e40. doi:10.1371/journal.ppat.0020040. PMC 1463017. PMID 16710452.
• Yuasa MS, Masutani C, Hirano A, Cohn MA, Yamaizumi M, Nakatani Y, Hanaoka F (July 2006). "A human DNA polymerase eta complex containing Rad18, Rad6 and Rev1; proteomic analysis and targeting of the complex to the chromatin-bound fraction of cells undergoing replication fork arrest". Genes to Cells. 11 (7): 731–44. doi:10.1111/j.1365-2443.2006.00974.x. PMID 16824193.
• 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. PMID 16964243.
• Olsen JV, Blagoev B, Gnad F, Macek B, Kumar C, Mortensen P, Mann M (November 2006). "Global, in vivo, and site-specific phosphorylation dynamics in signaling networks". Cell. 127 (3): 635–48. doi:10.1016/j.cell.2006.09.026. PMID 17081983.