RADX Modulates RAD51 Activity to Control Replication Fork Protection.

RADX Modulates RAD51 Activity to Control Replication Fork Protection.
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DOI:
10.1016/j.celrep.2018.06.061
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发表时间:
2018-07-17
期刊:
影响因子:
8.8
通讯作者:
Cortez D
Cortez D
中科院分区:
生物学1区
文献类型:
--
作者:
Bhat KP;Krishnamoorthy A;Dungrawala H;Garcin EB;Modesti M;Cortez D

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RAD51促进双链断裂的同源重组修复(HR),并在DNA复制过程中促进分叉逆转和保护新生DNA链免受核酸酶酶切。一些额外的HR蛋白通过促进RAD51丝的形成来调节分叉保护。在这里,我们表明RADX通过拮抗RAD51来调节失速叉保护。因此,沉默RADX可在缺乏BRCA1、BRCA2、FANCA、FANCD2或BOD1L的细胞中恢复分叉保护。使RADX失活可防止MRE11-和dna -依赖性分叉降解。此外,RADX过表达导致依赖于这些核酸酶和叉反转的叉降解。RAD51的数量决定了停滞的复制分叉的命运,分叉保护所需的RAD51多于分叉反转所需的RAD51。最后,我们发现RADX有效地与RAD51竞争单链DNA的结合,支持RADX缓冲RAD51以确保适量的逆转和保护以维持基因组稳定性的模型。
RAD51 promotes homologous recombination repair (HR) of double-strand breaks and acts during DNA replication to facilitate fork reversal and protect nascent DNA strands from nuclease digestion. Several additional HR proteins regulate fork protection by promoting RAD51 filament formation. Here we show that RADX modulates stalled fork protection by antagonizing RAD51. Consequently, silencing RADX restores fork protection in cells deficient for BRCA1, BRCA2, FANCA, FANCD2, or BOD1L. Inactivating RADX prevents both MRE11- and DNA2-dependent fork degradation. Furthermore, RADX overexpression causes fork degradation that is dependent on these nucleases and fork reversal. The amount of RAD51 determines the fate of stalled replication forks, with more RAD51 required for fork protection than fork reversal. Finally, we find that RADX effectively competes with RAD51 for binding to single-stranded DNA, supporting a model in which RADX buffers RAD51 to ensure the right amount of reversal and protection to maintain genome stability.
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