CtIP links DNA double-strand break sensing to resection.

CtIP links DNA double-strand break sensing to resection.
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DOI:
10.1016/j.molcel.2009.12.002
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发表时间:
2009-12-25
期刊:
影响因子:
16
通讯作者:
Hunter T
Hunter T
中科院分区:
生物学1区
文献类型:
--
作者:
You Z;Shi LZ;Zhu Q;Wu P;Zhang YW;Basilio A;Tonnu N;Verma IM;Berns MW;Hunter T

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作为对DNA双链断裂(DSB)的反应,细胞感知DNA损伤,然后激活蛋白激酶ATM。随后的DSB切除产生RPA包被的ssDNA,其对于通过同源重组(HR)激活DNA损伤检查点和DNA修复是必需的。然而,从DSB传感到切除的转变的生化机制仍然不清楚。使用非洲爪蟾卵提取物和人类细胞,我们表明,肿瘤抑制蛋白CtIP在这一转变中起着至关重要的作用。我们发现,CtIP易位到DSB,这是依赖于DSB传感器复合物Mre 11-Rad 50-NBS 1,ATM的激酶活性和CtIP中的直接DNA结合基序,然后促进DSB切除。因此,CtIP促进了从DSB传感到加工的转变:它通过在DSB传感和ATM激活后结合DSB处的DNA,然后促进DNA切除,导致检查点激活和HR。
In response to DNA double-strand breaks (DSBs), cells sense the DNA lesions and then activate the protein kinase ATM. Subsequent DSB resection produces RPA-coated ssDNA that is essential for activation of the DNA damage checkpoint and DNA repair by homologous recombination (HR). However, the biochemical mechanism underlying the transition from DSB sensing to resection remains unclear. Using Xenopus egg extracts and human cells we show that the tumor suppressor protein CtIP plays a critical role in this transition. We find that CtIP translocates to DSBs, which is dependent on the DSB sensor complex Mre11-Rad50-NBS1, the kinase activity of ATM and a direct DNA-binding motif in CtIP, and then promotes DSB resection. Thus, CtIP facilitates the transition from DSB sensing to processing: It does so by binding to the DNA at DSBs after DSB sensing and ATM activation, and then promoting DNA resection leading to checkpoint activation and HR.
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