Replication Fork Reversal during DNA Interstrand Crosslink Repair Requires CMG Unloading.

Replication Fork Reversal during DNA Interstrand Crosslink Repair Requires CMG Unloading.
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DOI:
10.1016/j.celrep.2018.05.061
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发表时间:
2018-06-19
期刊:
影响因子:
8.8
通讯作者:
Walter JC
Walter JC
中科院分区:
生物学1区
文献类型:
--
作者:
Amunugama R;Willcox S;Wu RA;Abdullah UB;El-Sagheer AH;Brown T;McHugh PJ;Griffith JD;Walter JC

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DNA链间交联(ICL)具有极强的细胞毒性,但其修复机制尚不完全清楚。使用非洲爪哇鸡蛋提取物,我们先前证明,当两个复制叉子汇聚在病变上时,顺铂ICL的修复被触发。在CDC45/MCM2-7/GINS(CMG)泛素化和p97分离酶卸载后,FANCI-FANCD2通过XPF-ERCC1促进DNA切割,导致ICL解钩。在这里,我们报告,在这个无细胞的ICL修复反应中,两个会聚的叉子中的一个经历了逆转。当禁止CMG卸载时,叉子反转失败,但它不需要FANCI-FANCD2。在一个叉子被颠倒后,仍然紧靠ICL的另一个叉子被切开。我们的数据表明,ICL的复制分叉颠倒需要复制体解离。我们提出了一个修正的ICL修复模型,其中包括一个倒叉中间体。DNA链间交联(ICL)是一种极具细胞毒性的损伤,主要以复制偶联的方式修复。使用无细胞系统,Amunugama等人。报告说,在ICL修复期间,复制叉会发生颠倒。分叉反转需要复制的CMG解旋酶卸载。
DNA interstrand crosslinks (ICLs) are extremely cytotoxic, but the mechanism of their repair remains incompletely understood. Using Xenopus egg extracts, we previously showed that repair of a cisplatin ICL is triggered when two replication forks converge on the lesion. After CDC45/MCM2-7/GINS (CMG) ubiquitylation and unloading by the p97 segregase, FANCI-FANCD2 promotes DNA incisions by XPF-ERCC1, leading to ICL unhooking. Here, we report that, during this cell-free ICL repair reaction, one of the two converged forks undergoes reversal. Fork reversal fails when CMG unloading is inhibited, but it does not require FANCI-FANCD2. After one fork has undergone reversal, the opposing fork that still abuts the ICL undergoes incisions. Our data show that replication fork reversal at an ICL requires replisome disassembly. We present a revised model of ICL repair that involves a reversed fork intermediate. DNA interstrand crosslinks (ICLs) are extremely cytotoxic lesions that are mainly repaired in a replication-coupled manner. Using a cell-free system, Amunugama et al. report that, during ICL repair, replication forks undergo reversal. Fork reversal requires replicative CMG helicase unloading.
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