Mre11-Rad50-Xrs2 and Sae2 promote 5' strand resection of DNA double-strand breaks.

Mre11-Rad50-Xrs2 and Sae2 promote 5' strand resection of DNA double-strand breaks.
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DOI:
10.1038/nsmb.1957
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发表时间:
2010-12
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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通过同源重组修复DNA双链断裂对基因组稳定性至关重要。该过程的第一步是切除5'链以产生3'单链DNA中间体。芽殖酵母中的有效切除需要Mre 11-Rad 50-Xrs 2(MRX)复合物和Sae 2蛋白,尽管MRX的作用尚不清楚,因为Mre 11在体外矛盾地表现出3'至5'核酸外切酶活性。在这里,我们用纯化的MRX、Sae 2和Exo 1蛋白重建切除,并表明当Exo 1水平受限时,5'链的降解由Exo 1催化,但完全依赖于MRX和Sae 2。这种刺激在很大程度上是Exo 1、MRX和Sae 2协同结合DNA底物的结果。这项工作确立了MRX和Sae 2在DNA双链断裂修复中促进5'链切除的直接作用。
The repair of DNA double-strand breaks by homologous recombination is essential for genomic stability. The first step in this process is resection of 5’ strands to generate 3’ single-stranded DNA intermediates. Efficient resection in budding yeast requires the Mre11–Rad50–Xrs2 (MRX) complex and the Sae2 protein, although the role of MRX has been unclear since Mre11 paradoxically exhibits 3’ to 5’ exonuclease activity in vitro. Here we reconstitute resection with purified MRX, Sae2, and Exo1 proteins and show that degradation of the 5’ strand is catalyzed by Exo1 yet completely dependent on MRX and Sae2 when Exo1 levels are limiting. This stimulation is largely the result of cooperative binding of DNA substrates by Exo1, MRX, and Sae2. This work establishes the direct role of MRX and Sae2 in promoting the resection of 5’ strands in DNA double-strand break repair.
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