Repair of a DNA-protein crosslink by replication-coupled proteolysis.

Repair of a DNA-protein crosslink by replication-coupled proteolysis.
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DOI:
10.1016/j.cell.2014.09.024
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发表时间:
2014-10-09
期刊:
影响因子:
64.5
通讯作者:
Walter JC
Walter JC
中科院分区:
生物学1区
文献类型:
--
作者:
Duxin JP;Dewar JM;Yardimci H;Walter JC

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dna -蛋白交联(DPCs)是由环境、内源性和化疗药物引起的,对基因组的稳定性构成严重威胁。我们使用爪蟾卵提取物来概括DPC修复,并表明这一过程与DNA复制相耦合。前导链模板上的DPC通过停止CMG解旋酶来阻止病变前的复制体。然后DPC在DNA上降解,产生肽-DNA加合物,CMG绕过该加合物。前导链随后继续合成,在加合物处再次停止,然后延伸过加合物。绕过肽加合物需要DNA pol ζ。后链模板上的DPC只会暂时阻止复制体,但它也会被降解,允许冈崎片段绕过。我们的实验描述了一种多功能的、基于蛋白质水解的S期DPC修复机制,该机制避免了复制叉崩溃以及在修复过程中诱导双链断裂的需要。
DNA-protein crosslinks (DPCs) are caused by environmental, endogenous, and chemotherapeutic agents and pose a severe threat to genome stability. We use Xenopus egg extracts to recapitulate DPC repair and show that this process is coupled to DNA replication. A DPC on the leading strand template arrests the replisome ahead of the lesion by stalling the CMG helicase. The DPC is then degraded on DNA, yielding a peptide-DNA adduct that is bypassed by CMG. The leading strand subsequently resumes synthesis, stalls again at the adduct, and then extends past it. Bypass of the peptide adduct requires DNA pol ζ. A DPC on the lagging strand template only transiently stalls the replisome, but it too is degraded, allowing Okazaki fragment bypass. Our experiments describe a versatile, proteolysis-based mechanism of S phase DPC repair that avoids replication fork collapse as well as the need to induce double strand breaks in the repair process.
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