Structural basis of 5' flap recognition and protein-protein interactions of human flap endonuclease 1.

Structural basis of 5' flap recognition and protein-protein interactions of human flap endonuclease 1.
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DOI:
10.1093/nar/gky911
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发表时间:
2018-11-30
影响因子:
14.9
通讯作者:
Zhao Y
Zhao Y
中科院分区:
生物学2区
文献类型:
--
作者:
Xu H;Shi R;Han W;Cheng J;Xu X;Cheng K;Wang L;Tian B;Zheng L;Shen B;Hua Y;Zhao Y

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人瓣核酸内切酶1(Human flap endonuclease 1,hFEN 1)是一种结构特异性核酸酶,在DNA复制和修复过程中起重要作用。hFEN 1具有5′侧翼去除活性,以及缺口核酸内切酶活性,这对于重新启动停滞的复制叉至关重要。在这里,我们报告的晶体结构的野生型和突变体hFEN 1蛋白质与DNA底物的复合物,随后通过诱变研究,提供了机制的洞察hFEN 1的蛋白质-蛋白质相互作用。我们发现,在形成α-螺旋的hFEN 1的螺旋网关识别5′瓣之前,它进入裂解的活性位点。我们还发现在R192 F hFEN 1-DNA结构中,β-pin区域被硬化成短螺旋,抑制其缺口核酸内切酶活性和周期依赖性激酶相互作用。我们的研究结果表明,在主要甲基化位点的单一突变可以改变hFEN 1的功能,并提供洞察的β-pin区域在hFEN 1蛋白质相互作用,DNA复制和修复是必不可少的作用。
Human flap endonuclease 1 (hFEN1) is a structure-specific nuclease essential for DNA replication and repair processes. hFEN1 has 5′ flap removal activity, as well as gap endonuclease activity that is critical for restarting stalled replication forks. Here, we report the crystal structures of wild-type and mutant hFEN1 proteins in complex with DNA substrates, followed by mutagenesis studies that provide mechanistic insight into the protein–protein interactions of hFEN1. We found that in an α-helix forming the helical gateway of hFEN1 recognizes the 5′ flap prior to its threading into the active site for cleavage. We also found that the β-pin region is rigidified into a short helix in R192F hFEN1–DNA structures, suppressing its gap endonuclease activity and cycle-dependent kinase interactions. Our findings suggest that a single mutation at the primary methylation site can alter the function of hFEN1 and provide insight into the role of the β-pin region in hFEN1 protein interactions that are essential for DNA replication and repair.
DOI: 10.7554/elife.14294
发表时间: 2016-04-08
期刊: eLife
影响因子: 7.7
作者:
Cheng K;Xu H;Chen X;Wang L;Tian B;Zhao Y;Hua Y
通讯作者: Hua Y
DOI: 10.1038/nchembio.2148
发表时间: 2016-10
影响因子: 14.8
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发表时间: 2012-08-10
期刊: MOLECULAR CELL
影响因子: 16
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DOI: 10.1038/nchembio.422
发表时间: 2010-10
影响因子: 14.8
作者:
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通讯作者: Shen, Binghui
人皮瓣核酸内切酶 1 催化反应所需的底物构象变化的 DNA 和蛋白质要求。
DOI: 10.1074/jbc.m115.698993
发表时间: 2016-04-08
期刊: The Journal of biological chemistry
影响因子: --
作者:
Algasaier SI;Exell JC;Bennet IA;Thompson MJ;Gotham VJ;Shaw SJ;Craggs TD;Finger LD;Grasby JA
通讯作者: Grasby JA