BRCA1 promotes unloading of the CMG helicase from a stalled DNA replication fork.

BRCA1 promotes unloading of the CMG helicase from a stalled DNA replication fork.
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DOI:
10.1016/j.molcel.2014.08.012
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发表时间:
2014-10-02
期刊:
影响因子:
16
通讯作者:
Walter, Johannes C.
Walter, Johannes C.
中科院分区:
生物学1区
文献类型:
--
作者:
Long, David T.;Joukov, Vladimir;Budzowska, Magda;Walter, Johannes C.

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肿瘤抑制蛋白BRCA1促进同源重组(HR),这是一种高保真机制,可修复在正常复制过程中和DNA损伤剂反应中出现的DNA双链断裂(DSBs)。最近的遗传实验表明,BRCA1在DNA链间交联(ICLs)修复过程中也发挥了与hr无关的功能。在这里,我们证明在复制叉与ICL碰撞后,BRCA1需要从染色质上卸载CMG解旋酶复合体。停止的解旋酶的排出允许导链向ICL延伸,随后是交联的核内溶解处理、病变旁路和DSB修复。我们的研究结果确定brca1依赖性解旋酶卸载是ICL修复的关键早期事件。
The tumor suppressor protein BRCA1 promotes homologous recombination (HR), a high fidelity mechanism to repair DNA double-strand breaks (DSBs) that arise during normal replication and in response to DNA damaging agents. Recent genetic experiments indicate that BRCA1 also performs an HR-independent function during the repair of DNA interstrand crosslinks (ICLs). Here, we show that BRCA1 is required to unload the CMG helicase complex from chromatin after replication forks collide with an ICL. Eviction of the stalled helicase allows leading strands to be extended toward the ICL, followed by endonucleolytic processing of the crosslink, lesion bypass, and DSB repair. Our results identify BRCA1-dependent helicase unloading as a critical, early event in ICL repair.
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