Human BRCA1-BARD1 ubiquitin ligase activity counteracts chromatin barriers to DNA resection.

Human BRCA1-BARD1 ubiquitin ligase activity counteracts chromatin barriers to DNA resection.
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DOI:
10.1038/nsmb.3236
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发表时间:
2016-07
影响因子:
16.8
通讯作者:
Morris JR
Morris JR
中科院分区:
生物学1区
文献类型:
--
作者:
Densham RM;Garvin AJ;Stone HR;Strachan J;Baldock RA;Daza-Martin M;Fletcher A;Blair-Reid S;Beesley J;Johal B;Pearl LH;Neely R;Keep NH;Watts FZ;Morris JR

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53BP1和BRCA1的相反活性影响DNA双链断裂修复途径的选择。BRCA1如何对抗53BP1对DNA切除和同源重组的抑制作用尚不清楚。在这里,我们确定了启动泛素从E2~泛素转移所需的BRCA1-BARD1位点。我们证明了BRCA1-BARD‘S泛素连接酶的活性对于53BP1在受损染色质上的重新定位是必需的。我们通过BRCA1-BARD1证实了H_2A泛素化,并表明H_2A-泛素融合蛋白促进了BARD_1缺陷细胞的DNA切除和修复。我们发现BRCA1-BARD1功能的同源重组需要染色质重构体SMARCAD1。SMARCAD1与H_2A-泛素结合,在DNA修复中对损伤部位和活性的最佳定位需要它的泛素结合线索结构域。53BP1的重新定位需要SMARCAD1,而53BP1的丢失减轻了对SMARCAD1在奥拉帕利或喜树碱耐药中的需求。因此,BRCA1-BARD1连接酶活性和随后的SMARCAD1依赖的染色质重塑是DNA修复的关键调节因素。
The opposing activities of 53BP1 and BRCA1 influence pathway choice of DNA double-strand break repair. How BRCA1 counters the inhibitory effect of 53BP1 on DNA resection and homologous recombination is unknown. Here we identify the site of BRCA1-BARD1 required for priming ubiquitin transfer from E2~ubiquitin. We demonstrate that BRCA1-BARD1’s ubiquitin ligase activity is required for repositioning 53BP1 on damaged chromatin. We confirm H2A ubiquitylation by BRCA1-BARD1 and show that an H2A-ubiquitin fusion protein promotes DNA resection and repair in BARD1 deficient cells. We show BRCA1-BARD1 function in homologous recombination requires the chromatin remodeler SMARCAD1. SMARCAD1 binding to H2A-ubiquitin, optimal localization to sites of damage and activity in DNA repair requires its ubiquitin-binding CUE domains. SMARCAD1 is required for 53BP1 repositioning and the need for SMARCAD1 in Olaparib or camptothecin resistance is alleviated by 53BP1 loss. Thus BRCA1-BARD1 ligase activity and subsequent SMARCAD1-dependent chromatin remodeling are critical regulators of DNA repair.
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