DNA repair. PAXX, a paralog of XRCC4 and XLF, interacts with Ku to promote DNA double-strand break repair.

DNA repair. PAXX, a paralog of XRCC4 and XLF, interacts with Ku to promote DNA double-strand break repair.
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DOI:
10.1126/science.1261971
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发表时间:
2015-01-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Jackson SP
Jackson SP
中科院分区:
其他
文献类型:
--
作者:
Ochi T;Blackford AN;Coates J;Jhujh S;Mehmood S;Tamura N;Travers J;Wu Q;Draviam VM;Robinson CV;Blundell TL;Jackson SP

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XRCC 4和XLF是两种结构相关的蛋白质,在DNA双链断裂(DSB)修复中起作用。在这里,我们将人PAXX(XRCC 4和XLF的PArna;也称为C9 orf 142)确定为新的XRCC 4超家族成员,并表明其晶体结构类似于XRCC 4。PAXX直接与DSB修复蛋白Ku相互作用,并被募集到细胞中的DNA损伤位点。使用RNA干扰和CRISPR-Cas9产生PAXX−/−细胞,我们证明PAXX与XRCC 4和XLF一起发挥作用,介导DSB修复和细胞存活,以响应DSB诱导剂。最后,我们揭示了PAXX在体外促进Ku依赖的DNA连接,并在细胞中受损的染色质上组装核心非同源末端连接(NHEJ)因子。这些发现将PAXX确定为NHEJ机器的新组件。
XRCC4 and XLF are two structurally-related proteins that function in DNA double-strand break (DSB) repair. Here, we identify human PAXX (PAralog of XRCC4 and XLF; also called C9orf142) as a new XRCC4-superfamily member, and show that its crystal structure resembles that of XRCC4. PAXX interacts directly with the DSB-repair protein Ku and is recruited to DNA-damage sites in cells. Using RNA interference and CRISPR-Cas9 to generate PAXX−/− cells, we demonstrate that PAXX functions with XRCC4 and XLF to mediate DSB repair and cell survival in response to DSB-inducing agents. Finally, we reveal that PAXX promotes Ku-dependent DNA ligation in vitro, and assembly of core non-homologous end-joining (NHEJ) factors on damaged chromatin in cells. These findings identify PAXX as a new component of the NHEJ machinery.
NHEJ的结构洞察力:建立动态DSB修复超级复合物,一个组件和相互作用的集成图片。
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