Structure Basis for Shaping the Nse4 Protein by the Nse1 and Nse3 Dimer within the Smc5/6 Complex.

Structure Basis for Shaping the Nse4 Protein by the Nse1 and Nse3 Dimer within the Smc5/6 Complex.
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DOI:
10.1016/j.jmb.2021.166910
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发表时间:
2021-04-30
影响因子:
5.6
通讯作者:
Cho Y
Cho Y
中科院分区:
生物学2区
文献类型:
--
作者:
Jo A;Li S;Shin JW;Zhao X;Cho Y

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Smc 5/6复合物促进染色体复制和DNA断裂修复。在该复合物中,由Nse 1、Nse 3和Nse 4组成的亚复合物被认为通过DNA结合和调节复合物的ATP依赖性活性而发挥多种作用。然而,Nse 1-Nse 3-Nse 4亚复合物如何执行这些多重功能仍不清楚。为了解决这个问题,我们确定了非洲爪蟾Nse 1-Nse 3-Nse 4亚复合物的晶体结构,分辨率为1.7 μ m,并研究了它如何与DNA相互作用。我们的结构分析表明,Nse 1-Nse 3二聚体采用封闭的构象,并与Nse 4的一段形成三个界面,迫使它进入Z形构象。Nse 1-Nse 3-Nse 4结构为肺部疾病免疫缺陷和染色体断裂综合征引起的突变如何从Nse 1-Nse 3中驱逐Nse 4提供了解释。我们的DNA结合和突变分析表明,Nse 4的N-末端和中间区域有助于DNA相互作用和细胞活力。将我们的数据与以前的交联质谱数据相结合,我们提出了Nse 1-Nse 3-Nse 4复合物在Smc 5/6复合物中结合DNA的潜在作用。
The Smc5/6 complex facilitates chromosome replication and DNA break repair. Within this complex, a subcomplex composed of Nse1, Nse3 and Nse4 is thought to play multiple roles through DNA binding and regulating ATP-dependent activities of the complex. However, how the Nse1-Nse3-Nse4 subcomplex carries out these multiple functions remain unclear. To address this question, we determine the crystal structure of the Xenopus laevis Nse1-Nse3-Nse4 subcomplex at 1.7 Å resolution and examine how it interacts with DNA. Our structural analyses show that the Nse1-Nse3 dimer adopts a closed conformation and forms three interfaces with a segment of Nse4, forcing it into a Z-shaped conformation. The Nse1-Nse3-Nse4 structure provides an explanation for how the lung disease immunodeficiency and chromosome breakage syndrome-causing mutations could dislodge Nse4 from Nse1-Nse3. Our DNA binding and mutational analyses reveal that the N-terminal and the middle region of Nse4 contribute to DNA interaction and cell viability. Integrating our data with previous crosslink mass spectrometry data, we propose potential roles of the Nse1-Nse3-Nse4 complex in binding DNA within the Smc5/6 complex.
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