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Schmidt, Christine K; Galanty, Yaron; Sczaniecka-Clift, Matylda; Coates, Julia; Jhujh, Satpal; Demir, Mukerrem; Cornwell, Matthew; Beli, Petra; Jackson, Stephen P
Nature cell biology, 11/2015, Volume: 17, Issue: 11Journal Article
Ubiquitylation is crucial for proper cellular responses to DNA double-strand breaks (DSBs). If unrepaired, these highly cytotoxic lesions cause genome instability, tumorigenesis, neurodegeneration or premature ageing. Here, we conduct a comprehensive, multilayered screen to systematically profile all human ubiquitin E2 enzymes for impacts on cellular DSB responses. With a widely applicable approach, we use an exemplary E2 family, UBE2Ds, to identify ubiquitylation-cascade components downstream of E2s. Thus, we uncover the nuclear E3 ligase RNF138 as a key homologous recombination (HR)-promoting factor that functions with UBE2Ds in cells. Mechanistically, UBE2Ds and RNF138 accumulate at DNA-damage sites and act at early resection stages by promoting CtIP ubiquitylation and accrual. This work supplies insights into regulation of DSB repair by HR. Moreover, it provides a rich information resource on E2s that can be exploited by follow-on studies.
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