Interactome analysis identifies a new paralogue of XRCC4 in non-homologous end joining DNA repair pathway.

Interactome analysis identifies a new paralogue of XRCC4 in non-homologous end joining DNA repair pathway.
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相互作用组分析在非同源末端连接 DNA 修复途径中鉴定出 XRCC4 的新旁系同源物。

DOI:
10.1038/ncomms7233
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发表时间:
2015-02-11
影响因子:
16.6
通讯作者:
Xu, Dongyi
Xu, Dongyi
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Xing, Mengtan;Yang, Mingrui;Huo, Wei;Feng, Feng;Wei, Leizhen;Jiang, Wenxia;Ning, Shaokai;Yan, Zhenxin;Li, Wen;Wang, Qingsong;Hou, Mei;Dong, Chunxia;Guo, Rong;Gao, Ge;Ji, Jianguo;Zha, Shan;Lan, Li;Liang, Huanhuan;Xu, Dongyi

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非同源末端连接(NHEJ)是DNA双链断裂(DSB)修复的主要途径之一,它可以表现出不同类型的断裂末端。然而,目前还不清楚NHEJ因子如何组织修复不同类型的DNA断裂。在这里,通过对人类NHEJ因子相互作用组的系统分析,我们确定PAXX作为Ku的直接相互作用者。PAXX的晶体结构与XRCC 4和XLF的晶体结构相似。重要的是,PAXX缺陷细胞对引起DSB的试剂敏感。此外,上位性分析表明,PAXX的功能与XLF在电离辐射诱导的复杂的DSB,而他们的功能冗余的Topo2诱导的简单的DSB。因此,PAXX和XLF在体外协同促进复杂DNA末端的连接,而不是简单DNA末端的连接。总之,我们的数据确定PAXX作为一个新的NHEJ因素,并提供有关组织的NHEJ因素响应不同类型的DSB结束的见解。 DNA双链断裂(DSB)是一种高度有害的DNA损伤形式,与多种类型的断裂末端相关。在这里,作者鉴定了一种XRCC4样因子,它在非同源末端连接DNA修复途径中发挥作用,以修复具有复杂断裂末端的DSB。
Non-homologous end joining (NHEJ) is a major pathway to repair DNA double-strand breaks (DSBs), which can display different types of broken ends. However, it is unclear how NHEJ factors organize to repair diverse types of DNA breaks. Here, through systematic analysis of the human NHEJ factor interactome, we identify PAXX as a direct interactor of Ku. The crystal structure of PAXX is similar to those of XRCC4 and XLF. Importantly, PAXX-deficient cells are sensitive to DSB-causing agents. Moreover, epistasis analysis demonstrates that PAXX functions together with XLF in response to ionizing radiation-induced complex DSBs, whereas they function redundantly in response to Topo2 inhibitor-induced simple DSBs. Consistently, PAXX and XLF coordinately promote the ligation of complex but not simple DNA ends in vitro. Altogether, our data identify PAXX as a new NHEJ factor and provide insight regarding the organization of NHEJ factors responding to diverse types of DSB ends. DNA double-strand breaks (DSBs), a highly deleterious form of DNA damage, are associated with multiple types of broken ends. Here, the authors identify a XRCC4-like factor that functions in the non-homologous end-joining DNA repair pathway to repair DSBs with complex broken ends.
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