Requirement of ATM-dependent monoubiquitylation of histone H2B for timely repair of DNA double-strand breaks.

Requirement of ATM-dependent monoubiquitylation of histone H2B for timely repair of DNA double-strand breaks.
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DOI:
10.1016/j.molcel.2011.02.015
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发表时间:
2011-03-04
期刊:
影响因子:
16
通讯作者:
Shiloh Y
Shiloh Y
中科院分区:
生物学1区
文献类型:
--
作者:
Moyal L;Lerenthal Y;Gana-Weisz M;Mass G;So S;Wang SY;Eppink B;Chung YM;Shalev G;Shema E;Shkedy D;Smorodinsky NI;van Vliet N;Kuster B;Mann M;Ciechanover A;Dahm-Daphi J;Kanaar R;Hu MC;Chen DJ;Oren M;Shiloh Y

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细胞对DNA双链断裂(DSB)的反应是由蛋白激酶ATM动员的,ATM使DNA损伤反应(DDR)网络中的关键参与者磷酸化。一个主要问题是ATM如何控制DSB修复。最佳修复需要受损部位的染色质松弛。染色质重组与组蛋白翻译后修饰的动态改变相关联。在这里,我们表明,在人类细胞中,DSB诱导组蛋白H2 B的monoubiquitylation,在未受损的细胞与转录延伸相关的修改。我们发现,这一过程依赖于招聘DSB网站和ATM依赖性磷酸化的负责E3泛素连接酶:RNF 20-RNF 40异二聚体。H2 B单泛素化是两个主要的DSB修复途径-非同源末端连接和同源重组修复-以及通过这两个途径的最佳修复中的参与者的及时招募所必需的。我们的数据和以前的数据表明,一个两阶段的模型,染色质去凝聚,促进DSB修复。
The cellular response to DNA double-strand breaks (DSBs) is mobilized by the protein kinase ATM, which phosphorylates key players in the DNA damage response (DDR) network. A major question is how ATM controls DSB repair. Optimal repair requires chromatin relaxation at damaged sites. Chromatin reorganization is coupled to dynamic alterations in histone posttranslational modifications. Here, we show that in human cells, DSBs induce monoubiquitylation of histone H2B, a modification that is associated in undamaged cells with transcription elongation. We find that this process relies on recruitment to DSB sites and ATM-dependent phosphorylation of the responsible E3 ubiquitin ligase: the RNF20-RNF40 heterodimer. H2B monoubiquitylation is required for timely recruitment of players in the two major DSB repair pathways—nonhomologous end-joining and homologous recombination repair—and optimal repair via both pathways. Our data and previous data suggest a two-stage model for chromatin decondensation that facilitates DSB repair.
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