Correlation between Charge Transport and Base Excision Repair in the MutY-DNA Glycosylase.

Correlation between Charge Transport and Base Excision Repair in the MutY-DNA Glycosylase.
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DOI:
10.1021/acs.jpcb.0c08598
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发表时间:
2021-01-14
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Beratan DN
Beratan DN
中科院分区:
其他
文献类型:
--
作者:
Teo RD;Du X;Vera HLT;Migliore A;Beratan DN

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实验证据表明,DNA介导的高电位[Fe4S4]蛋白之间的氧化还原信号传导与DNA复制和修复过程有关,而[Fe4S4]簇与核酸之间的蛋白质介导的电荷转移(CT)是信号传导和修复机制的基本组成部分。我们利用分子动力学(MD)模拟和空穴跳跃途径分析了碱基切除修复糖基酶MutY的主要CT通路。我们发现错配的A·oxoG DNA碱基对的腺嘌呤核碱基有助于在MutY切除腺嘌呤之前进行[Fe4S4]-DNA CT。我们还发现MutY中的R153L突变(与结直肠腺瘤性息肉病有关)影响主要的[Fe4S4]-DNA CT通路,并显著降低其有效CT率。
Experimental evidence suggests that DNA-mediated redox signaling between high-potential [Fe4S4] proteins is relevant to DNA replication and repair processes, and protein-mediated charge transfer (CT) between [Fe4S4] clusters and nucleic acids is a fundamental component of the signaling and repair mechanisms. We analyzed the dominant CT pathways in the base excision repair glycosylase MutY using molecular dynamics (MD) simulations and hole hopping pathway analysis. We find that the adenine nucleobase of the mismatched A·oxoG DNA base pair facilitates [Fe4S4]-DNA CT prior to adenine excision by MutY. We also find that the R153L mutation in MutY (linked to colorectal adenomatous polyposis) influences the dominant [Fe4S4]-DNA CT pathways and appreciably decreases their effective CT rates.
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