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
中科院分区:
文献类型:
--
作者:
Duxin JP;Dewar JM;Yardimci H;Walter JC
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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DOI:
10.1126/science.1182372
发表时间:
2009-12-18
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Knipscheer P;Räschle M;Smogorzewska A;Enoiu M;Ho TV;Schärer OD;Elledge SJ;Walter JC
通讯作者:
Walter JC