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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Tandem protein interaction modules organize the ubiquitin-dependent response to DNA double-strand breaks.
Molecular Cell 2012 August 11
The response to DNA double-strand breaks (DSBs) entails the hierarchical recruitment of proteins orchestrated by ATM-dependent phosphorylation and RNF8-mediated chromatin ubiquitylation. As in most ubiquitin-dependent processes, the ordered accumulation of DNA repair factors at the break site relies on ubiquitin-binding domains (UBDs). However, how UBDs select their ligands is poorly understood, and therefore we sought to uncover the basis for selectivity in the ubiquitin-dependent DSB response. We show that RNF168, its paralog RNF169, RAD18, and the BRCA1-interacting RAP80 protein accumulate at DSB sites through the use of bipartite modules composed of UBDs juxtaposed to peptide motifs that provide specificity. These sequences, named LR motifs (LRMs), are transferable, and we show that the RNF169 LRM2 binds to nucleosomes, the substrates of RNF168. The LRM-based selection of ligands is a parsimonious means to build a highly discrete ubiquitin-based signaling pathway such as the DNA damage response.
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