Structures of human exonuclease 1 DNA complexes suggest a unified mechanism for nuclease family.

Structures of human exonuclease 1 DNA complexes suggest a unified mechanism for nuclease family.
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DOI:
10.1016/j.cell.2011.03.005
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发表时间:
2011-04-15
期刊:
影响因子:
64.5
通讯作者:
Beese LS
Beese LS
中科院分区:
生物学1区
文献类型:
--
作者:
Orans J;McSweeney EA;Iyer RR;Hast MA;Hellinga HW;Modrich P;Beese LS

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人核酸外切酶1(hExo 1)在DNA修复和重组过程中起着重要作用,维持基因组的完整性。它是核酸外切酶和核酸内切酶的5′结构特异性核酸酶家族的成员,包括FEN-1、XPG和GEN 1。我们目前的结构hExo 1在复杂的DNA基板,随后的诱变研究,并提出了一个共同的机制,这个核酸酶家族识别和处理不同的DNA结构。hExo 1在DNA的缺口或缺口处诱导急剧的弯曲。有缺口的双链体的磨损的5′端类似于皮瓣连接,统一了内切和外切溶核加工的机制。构象控制的一个移动的区域的催化位点表明通过结合蛋白质伴侣变构调节的机制。这些酶中底物结合位点的相对排列为底物识别和加工的复杂几何难题提供了一个优雅的解决方案。
Human exonuclease 1 (hExo1) plays important roles in DNA repair and recombination processes that maintain genomic integrity. It is a member of the 5′ structure-specific nuclease family of exonucleases and endonucleases that includes FEN-1, XPG, and GEN1. We present structures of hExo1 in complex with a DNA substrate, followed by mutagenesis studies, and propose a common mechanism by which this nuclease family recognizes and processes diverse DNA structures. hExo1 induces a sharp bend in the DNA at nicks or gaps. Frayed 5′ ends of nicked duplexes resemble flap junctions, unifying the mechanisms of endo- and exo-nucleolytic processing. Conformational control of a mobile region in the catalytic site suggests a mechanism for allosteric regulation by binding to protein partners. The relative arrangement of substrate binding sites in these enzymes provides an elegant solution to a complex geometrical puzzle of substrate recognition and processing.
FEN-1和XPG之间的域交换定义了XPG中介导核苷酸切除修复活性和底物特异性的区域。
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