Molecular basis for the inhibition of the methyl-lysine binding function of 53BP1 by TIRR.

Molecular basis for the inhibition of the methyl-lysine binding function of 53BP1 by TIRR.
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TIRR抑制53BP1甲基赖氨酸结合功能的分子基础

DOI:
10.1038/s41467-018-05174-9
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发表时间:
2018-07-12
影响因子:
16.6
通讯作者:
Liu X
Liu X
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang J;Yuan Z;Cui Y;Xie R;Yang G;Kassab MA;Wang M;Ma Y;Wu C;Yu X;Liu X

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53BP1在DNA双链断裂(DSB)修复中起着重要的作用,最近报道Tudor相互作用修复调节因子(TIRR)在DSB修复过程中负调控53BP1。在这里,我们介绍了53BP1串联都铎结构域(TTD)与TIRR的络合物的晶体结构。我们的结果表明,来自TIRR的三个环与53BP1 TTD相互作用,并掩盖了TTD中甲基化的赖氨酸结合口袋。因此,TIRR与组蛋白H4K20甲基化竞争53BP1结合。我们将关键相互作用残基定位在53BP1的TTD和TIRR上,其突变取消了复杂的形成。此外,TIRR还抑制了53BP1到DNA损伤的重新定位和53BP1依赖的DNA损伤修复。最后,尽管TIRR和NUDT16之间有很高的序列同源性,但由于缺乏结合所需的关键残基,NUDT16不能直接与53BP1相互作用。综上所述,我们的研究为TIRR介导抑制53BP1依赖的DNA损伤修复的分子机制提供了见解。
53BP1 performs essential functions in DNA double-strand break (DSB) repair and it was recently reported that Tudor interacting repair regulator (TIRR) negatively regulates 53BP1 during DSB repair. Here, we present the crystal structure of the 53BP1 tandem Tudor domain (TTD) in complex with TIRR. Our results show that three loops from TIRR interact with 53BP1 TTD and mask the methylated lysine-binding pocket in TTD. Thus, TIRR competes with histone H4K20 methylation for 53BP1 binding. We map key interaction residues in 53BP1 TTD and TIRR, whose mutation abolishes complex formation. Moreover, TIRR suppresses the relocation of 53BP1 to DNA lesions and 53BP1-dependent DNA damage repair. Finally, despite the high-sequence homology between TIRR and NUDT16, NUDT16 does not directly interact with 53BP1 due to the absence of key residues required for binding. Taken together, our study provides insights into the molecular mechanism underlying TIRR-mediated suppression of 53BP1-dependent DNA damage repair.
DOI: 10.1016/j.str.2014.11.013
发表时间: 2015-02-03
期刊: STRUCTURE
影响因子: 5.7
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发表时间: 2012-04-18
期刊: EMBO JOURNAL
影响因子: 11.4
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DOI: 10.1371/journal.pone.0131507
发表时间: 2015
期刊: PloS one
影响因子: 3.7
作者:
Trésaugues L;Lundbäck T;Welin M;Flodin S;Nyman T;Silvander C;Gräslund S;Nordlund P
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DOI: 10.1107/s0907444909052925
发表时间: 2010-02
期刊: Acta crystallographica. Section D, Biological crystallography
影响因子: --
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