RAD51- and MRE11-dependent reassembly of uncoupled CMG helicase complex at collapsed replication forks.

RAD51- and MRE11-dependent reassembly of uncoupled CMG helicase complex at collapsed replication forks.
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DOI:
10.1038/nsmb.2177
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发表时间:
2011-12-04
影响因子:
16.8
通讯作者:
Costanzo, Vincenzo
Costanzo, Vincenzo
中科院分区:
生物学1区
文献类型:
--
作者:
Hashimoto, Yoshitami;Puddu, Fabio;Costanzo, Vincenzo

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在高等真核生物中,复制体组件在分叉折叠和重新启动过程中的动态还知之甚少。在这里,我们通过诱导单链DNA(SsDNA)损伤,在分叉通过后在其中一个复制的姐妹染色单体中产生双链断裂(DSB),重建了复制叉的崩溃和重新启动。我们发现,在叉子坍塌时,活性的CDC45-MCM-gins(CMG)解旋酶复合体失去了它的gins亚单位。功能复制体的恢复是通过将GINS和POL epsilon以RAD51和Mre11依赖的方式重新加载到DNA上来恢复的,但与复制起始组装和激发无关。在断裂诱导复制(BIR)中存在缺陷的增殖细胞核抗原突变等位基因不能支持复制体完整性的恢复。这些结果表明,在高等真核生物中,复制体在叉子崩溃后被部分拆除,并通过重组介导的过程完全重建。
In higher eukaryotes the dynamics of replisome components during fork collapse and restart are poorly understood. Here, we reconstituted replication fork collapse and restart by inducing single-strand DNA (ssDNA) lesions that create a double-strand break (DSB) in one of the replicated sister chromatids after fork passage. We found that, upon fork collapse, the active CDC45–MCM–GINS (CMG) helicase complex loses its GINS subunit. A functional replisome is restored by the reloading of GINS and Pol epsilon onto DNA in a RAD51- and MRE11- dependent manner, but independently of replication origin assembly and firing. PCNA mutant alleles defective in break-induced replication (BIR) are unable to support restoration of replisome integrity. These results reveal that in higher eukaryotes replisomes are partially dismantled following fork collapse and fully re-established by a recombination-mediated process.
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