XLF and APLF bind Ku80 at two remote sites to ensure DNA repair by non-homologous end joining.

XLF and APLF bind Ku80 at two remote sites to ensure DNA repair by non-homologous end joining.
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DOI:
10.1038/s41594-018-0133-6
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发表时间:
2018-10
影响因子:
16.8
通讯作者:
Charbonnier JB
Charbonnier JB
中科院分区:
生物学1区
文献类型:
--
作者:
Nemoz C;Ropars V;Frit P;Gontier A;Drevet P;Yu J;Guerois R;Pitois A;Comte A;Delteil C;Barboule N;Legrand P;Baconnais S;Yin Y;Tadi S;Barbet-Massin E;Berger I;Le Cam E;Modesti M;Rothenberg E;Calsou P;Charbonnier JB

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Ku 70-Ku 80(Ku)异二聚体快速且紧密地结合到DNA双链断裂的末端,并通过尚不清楚的分子机制募集非同源末端连接(NHEJ)途径的几个因子。在这里,我们描述了结合到Ku-DNA复合物的NHEJ蛋白APLF(A-KBM)和XLF(X-KBM)的Ku结合基序(KBM)的晶体结构。两个KBM基序结合在Ku 80 α/β结构域的远程位点上。X-KBM占据了Ku 80 α/β结构域前所未有的大向外旋转后形成的内部口袋。我们揭示了独立的招聘在APLF相互作用蛋白XRCC 4和XLF的激光照射的网站,通过各自的结合A-和X-KBM Ku 80。最后,我们表明,突变的X-KBM和A-KBM的结合位点Ku 80妥协的效率和准确性的末端连接和细胞的放射敏感性。A-KBM和X-KBM可能代表建立NHEJ复杂相互作用网络所需的两个初始锚定点。
The Ku70-Ku80 (Ku) heterodimer binds rapidly and tightly to ends of DNA double-strand breaks and recruits several factors of the Non-Homologous End Joining (NHEJ) pathway through molecular mechanisms that remain unclear. Here, we describe the crystal structures of the Ku-binding motifs (KBM) of the NHEJ proteins APLF (A-KBM) and XLF (X-KBM) bound to a Ku-DNA complex. The two KBMs motifs bind on remote sites of Ku80 α/β domain. The X-KBM occupies an internal pocket formed after an unprecedented large outward rotation of the Ku80 α/β domain. We reveal independent recruitment at laser-irradiated sites of the APLF-interacting protein XRCC4 and of XLF through the respective binding of A- and X-KBMs to Ku80. Finally, we show that mutations on the X-KBM and A KBM binding sites in Ku80 compromises efficiency and accuracy of end-joining and cellular radiosensitivity. A- and X-KBMs may represent two initial anchorage points necessary to build the NHEJ intricate interactions network.
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