Structural basis for DNA 3'-end processing by human tyrosyl-DNA phosphodiesterase 1.

Structural basis for DNA 3'-end processing by human tyrosyl-DNA phosphodiesterase 1.
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DOI:
10.1038/s41467-017-02530-z
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发表时间:
2018-01-02
影响因子:
16.6
通讯作者:
Richardson JM
Richardson JM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Flett FJ;Ruksenaite E;Armstrong LA;Bharati S;Carloni R;Morris ER;Mackay CL;Interthal H;Richardson JM

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酪氨酸磷酸二酯酶(Tyrosyl-DNA phosphodiesterase,Tdp 1)是一种DNA 3′-末端加工酶,可修复拓扑异构酶1B引起的DNA损伤。我们使用一种新的工具,结合位点特异性DNA-蛋白质交联与质谱法,以确定Tdp 1与DNA的相互作用。一个保守的苯丙氨酸(F259)的Tdp 1,需要有效的DNA处理在生化测定,交联到DNA底物中的定义位置。Tdp 1-DNA复合物的晶体结构捕获了3′-末端切割后的DNA修复机制;这些揭示了Tdp 1如何协调核苷酶活性的3′-磷酸化产物并容纳双链DNA。一个疏水楔形物将DNA末端分开,引导易断裂的链通过一个通道到达活性位点。F259侧链与-3碱基对重叠,界定了断裂和熔化的DNA的连接点,并将易断裂的DNA链固定在通道中。我们的结果解释了为什么Tdp 1切割是非进行性的,并提供了DNA 3′-末端加工的Tdp 1的分子基础。人酪氨酰-DNA磷酸二酯酶1(Tdp 1)修复共价捕获的拓扑异构酶1B-DNA复合物和其他病变,是抗癌药物开发的靶点。在这里,作者使用一种整合的结构方法来阐明Tdp 1 DNA末端加工的分子基础。
Tyrosyl-DNA phosphodiesterase (Tdp1) is a DNA 3′-end processing enzyme that repairs topoisomerase 1B-induced DNA damage. We use a new tool combining site-specific DNA–protein cross-linking with mass spectrometry to identify Tdp1 interactions with DNA. A conserved phenylalanine (F259) of Tdp1, required for efficient DNA processing in biochemical assays, cross-links to defined positions in DNA substrates. Crystal structures of Tdp1–DNA complexes capture the DNA repair machinery after 3′-end cleavage; these reveal how Tdp1 coordinates the 3′-phosphorylated product of nucleosidase activity and accommodates duplex DNA. A hydrophobic wedge splits the DNA ends, directing the scissile strand through a channel towards the active site. The F259 side-chain stacks against the −3 base pair, delimiting the junction of duplexed and melted DNA, and fixes the scissile strand in the channel. Our results explain why Tdp1 cleavage is non-processive and provide a molecular basis for DNA 3′-end processing by Tdp1. Human tyrosyl-DNA phosphodiesterase 1 (Tdp1) repairs covalently trapped topoisomerase 1B-DNA complexes and other lesions, and is a target for anticancer drug development. Here the authors use an integrated structural approach to shed light onto the molecular basis of DNA end-processing by Tdp1.
DOI: 10.1073/pnas.0909917107
发表时间: 2010-03-02
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