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
中科院分区:
文献类型:
--
作者:
Flett FJ;Ruksenaite E;Armstrong LA;Bharati S;Carloni R;Morris ER;Mackay CL;Interthal H;Richardson JM
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.
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DOI:
10.1073/pnas.0909917107
发表时间:
2010-03-02
影响因子:
11.1
作者:
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通讯作者:
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影响因子:
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通讯作者:
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影响因子:
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通讯作者:
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