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Kolas, Nadine K.; Chapman, J. Ross; Nakada, Shinichiro; Ylanko, Jarkko; Chahwan, Richard; Sweeney, Frédéric D.; Panier, Stephanie; Mendez, Megan; Wildenhain, Jan; Thomson, Timothy M.; Pelletier, Laurence; Jackson, Stephen P.; Durocher, Daniel
Science (American Association for the Advancement of Science), 12/2007, Letnik: 318, Številka: 5856Journal Article
Cells respond to DNA double-strand breaks by recruiting factors such as the DNA-damage mediator protein MDC1, the p53-binding protein 1 (53BP1), and the breast cancer susceptibility protein BRCA1 to sites of damaged DNA. Here, we reveal that the ubiquitin ligase RNF8 mediates ubiquitin conjugation and 53BP1 and BRCA1 focal accumulation at sites of DNA lesions. Moreover, we establish that MDC1 recruits RNF8 through phosphodependent interactions between the RNF8 forkhead-associated domain and motifs in MDC1 that are phosphorylated by the DNA-damage activated protein kinase ataxia telangiectasia mutated (ATM). We also show that depletion of the E2 enzyme UBC13 impairs 53BP1 recruitment to sites of damage, which suggests that it cooperates with RNF8. Finally, we reveal that RNF8 promotes the G₂/M DNA damage checkpoint and resistance to ionizing radiation. These results demonstrate how the DNA-damage response is orchestrated by ATM-dependent phosphorylation of MDC1 and RNF8-mediated ubiquitination.
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in: SICRIS
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