ATM and CDK2 control chromatin remodeler CSB to inhibit RIF1 in DSB repair pathway choice.

ATM and CDK2 control chromatin remodeler CSB to inhibit RIF1 in DSB repair pathway choice.
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DOI:
10.1038/s41467-017-02114-x
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发表时间:
2017-12-04
影响因子:
16.6
通讯作者:
Zhu XD
Zhu XD
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Batenburg NL;Walker JR;Noordermeer SM;Moatti N;Durocher D;Zhu XD

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CSB 是 SWI2/SNF2 超家族的成员,参与 DNA 双链断裂 (DSB) 修复。然而,人们对它如何调节这一修复过程知之甚少。在这里,我们发现 CSB 通过其新鉴定的翼状螺旋结构域与 RIF1(53BP1 的效应子)相互作用,并且这种相互作用介导 CSB 在 S 期招募到 DSB。在 DSB 中,CSB 通过驱逐组蛋白来重塑染色质,这限制了 RIF1 及其效应子 MAD2L2,但促进了 BRCA1 积累。 CSB 的染色质重塑活性不仅需要 ATM 对 S10 进行损伤诱导的磷酸化,还需要细胞周期蛋白 A-CDK2 对 S158 进行细胞周期依赖性磷酸化。两种修饰均调节 CSB N 端区域与其 ATP 酶结构域的相互作用,此前已报道 ATP 酶结构域的活性受到 N 端区域的自动抑制。这些结果表明,ATM 和 CDK2 在 DSB 修复途径选择的调节中控制 CSB 的染色质重塑活性。科凯恩综合征 B 组蛋白 (CSB) 是一种参与双链断裂修复的多功能染色质重塑蛋白。在这里,作者研究了调节 CSB 活性的分子翻译后信号。
CSB, a member of the SWI2/SNF2 superfamily, is implicated in DNA double-strand break (DSB) repair. However, how it regulates this repair process is poorly understood. Here we uncover that CSB interacts via its newly identified winged helix domain with RIF1, an effector of 53BP1, and that this interaction mediates CSB recruitment to DSBs in S phase. At DSBs, CSB remodels chromatin by evicting histones, which limits RIF1 and its effector MAD2L2 but promotes BRCA1 accumulation. The chromatin remodeling activity of CSB requires not only damage-induced phosphorylation on S10 by ATM but also cell cycle-dependent phosphorylation on S158 by cyclin A-CDK2. Both modifications modulate the interaction of the CSB N-terminal region with its ATPase domain, the activity of which has been previously reported to be autorepressed by the N-terminal region. These results suggest that ATM and CDK2 control the chromatin remodeling activity of CSB in the regulation of DSB repair pathway choice. Cockayne syndrome group B protein (CSB) is a multifunctional chromatin remodeler involved in double-strand break repair. Here the authors investigate the molecular post-translational signals regulating CSB activity.
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