The MRX complex regulates Exo1 resection activity by altering DNA end structure
نویسندگان
چکیده
منابع مشابه
PCNA promotes processive DNA end resection by Exo1
Exo1-mediated resection of DNA double-strand break ends generates 3' single-stranded DNA overhangs required for homology-based DNA repair and activation of the ATR-dependent checkpoint. Despite its critical importance in inducing the overall DNA damage response, the mechanisms and regulation of the Exo1 resection pathway remain incompletely understood. Here, we identify the ring-shaped DNA clam...
متن کاملPhosphorylation of EXO1 by CDKs 1 and 2 regulates DNA end resection and repair pathway choice
Resection of DNA double-strand breaks (DSBs) is a pivotal step during which the choice between NHEJ and HR DNA repair pathways is made. Although CDKs are known to control initiation of resection, their role in regulating long-range resection remains elusive. Here we show that CDKs 1/2 phosphorylate the long-range resection nuclease EXO1 at four C-terminal S/TP sites during S/G2 phases of the ce...
متن کاملThe SOSS1 single-stranded DNA binding complex promotes DNA end resection in concert with Exo1.
The human SSB homologue 1 (hSSB1) has been shown to facilitate homologous recombination and double-strand break signalling in human cells. Here, we compare the DNA-binding properties of the SOSS1 complex, containing SSB1, with Replication Protein A (RPA), the primary single-strand DNA (ssDNA) binding complex in eukaryotes. Ensemble and single-molecule approaches show that SOSS1 binds ssDNA with...
متن کاملKu prevents Exo1 and Sgs1-dependent resection of DNA ends in the absence of a functional MRX complex or Sae2.
In this study, we investigate the interplay between Ku, a central non-homologous end-joining component, and the Mre11-Rad50-Xrs2 (MRX) complex and Sae2, end-processing factors crucial for initiating 5'-3' resection of double-strand break (DSB) ends. We show that in the absence of end protection by Ku, the requirement for the MRX complex is bypassed and resection is executed by Exo1. In contrast...
متن کاملThe MRX Complex Plays Multiple Functions in Resection of Yku- and Rif2-Protected DNA Ends
The ends of both double-strand breaks (DSBs) and telomeres undergo tightly regulated 5' to 3' resection. Resection of DNA ends, which is specifically inhibited during the G1 cell cycle phase, requires the MRX complex, Sae2, Sgs1 and Exo1. Moreover, it is negatively regulated by the non-homologous end-joining component Yku and the telomeric protein Rif2. Here, we investigate the nuclease activit...
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ژورنال
عنوان ژورنال: The EMBO Journal
سال: 2018
ISSN: 0261-4189,1460-2075
DOI: 10.15252/embj.201798588