Mechanism of 53BP1 activity regulation by RNA-binding TIRR and a designer protein.

Mechanism of 53BP1 activity regulation by RNA-binding TIRR and a designer protein.
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DOI:
10.1038/s41594-018-0083-z
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发表时间:
2018-07
影响因子:
16.8
通讯作者:
Mer G
Mer G
中科院分区:
生物学1区
文献类型:
--
作者:
Botuyan MV;Cui G;Drané P;Oliveira C;Detappe A;Brault ME;Parnandi N;Chaubey S;Thompson JR;Bragantini B;Zhao D;Chapman JR;Chowdhury D;Mer G

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动态蛋白质相互作用网络,如DNA双链断裂(DSB)信号转导是由翻译后修饰(PTM)。DNA修复因子53BP1是一种罕见的蛋白质,其PTM结合功能可以打开和关闭。53BP1通过识别染色质中的组蛋白赖氨酸甲基化而被募集到DSB,该活性直接被53BP1结合蛋白TIRR抑制。从X射线结构的TIRR和设计师的蛋白质绑定到53 BP1,我们揭示了一个独特的监管机制,一个复杂的结合区,集中在一个必不可少的TIRR精氨酸残基,块甲基化染色质结合表面的53 BP1(关闭开关)。我们发现,通过功能分离53BP1突变废除细胞中TIR介导的调节,使53BP1响应于DSB进入超活化状态,突出了TIRR的关键抑制功能。我们表明,这种53BP1抑制是由TIR相互作用的RNA分子缓解,从而提供了一个证明的原理机制,RNA触发53BP1招聘DSB(开关)。
Dynamic protein interaction networks such as DNA double-strand break (DSB) signaling are modulated by post-translational modifications (PTMs). The DNA repair factor 53BP1 is a rare example of a protein whose PTM binding function can be switched on and off. 53BP1 is recruited to DSBs by recognizing histone lysine methylation in chromatin, an activity directly inhibited by 53BP1-binding protein TIRR. From X-ray structures of TIRR and a designer protein bound to 53BP1, we reveal a unique regulatory mechanism where an intricate binding area, centered on an essential TIRR arginine residue, blocks the methylated chromatin-binding surface of 53BP1 (the off switch). We find that abolishing TIRR-mediated regulation in cells via a separation-of-function 53BP1 mutation brings 53BP1 to a state of hyperactivation in response to DSBs, highlighting the key inhibitory function of TIRR. We show that this 53BP1 inhibition is relieved by TIRR-interacting RNA molecules, thus providing a proof-of-principle mechanism for RNA-triggered 53BP1 recruitment to DSBs (the on switch).
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