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Structure of Mre11-Nbs1 complex yields insights into ataxia-telangiectasia-like disease mutations and DNA damage signaling.

Nat. Struct. Mol. Biol.2012 Jun 17;19(7):693-700
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摘要


The Mre11-Rad50-Nbs1 (MRN) complex tethers, processes and signals DNA double-strand breaks, promoting genomic stability. To understand the functional architecture of MRN, we determined the crystal structures of the Schizosaccharomyces pombe Mre11 dimeric catalytic domain alone and in complex with a fragment of Nbs1. Two Nbs1 subunits stretch around the outside of the nuclease domains of Mre11, with one subunit additionally bridging and locking the Mre11 dimer via a highly conserved asymmetrical binding motif. Our results show that Mre11 forms a flexible dimer and suggest that Nbs1 not only is a checkpoint adaptor but also functionally influences Mre11-Rad50. Clinical mutations in Mre11 are located along the Nbs1-interaction sites and weaken the Mre11-Nbs1 interaction. However, they differentially affect DNA repair and telomere maintenance in Saccharomyces cerevisiae, potentially providing insight into their different human disease pathologies.

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