Dynamic Processing of a Common Oxidative DNA Lesion by the First Two Enzymes of the Base Excision Repair Pathway.

Dynamic Processing of a Common Oxidative DNA Lesion by the First Two Enzymes of the Base Excision Repair Pathway.
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DOI:
10.1016/j.jmb.2021.166811
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发表时间:
2021-03-05
影响因子:
5.6
通讯作者:
Suo Z
Suo Z
中科院分区:
生物学2区
文献类型:
--
作者:
Raper AT;Maxwell BA;Suo Z

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碱基切除修复(BER)是真核细胞修复单碱基损伤的主要途径。单碱基损伤的一个常见例子是8-氧代-7,8-二氢-2 ′-脱氧鸟嘌呤(8-oxoG)。8-oxoG的高发病率和致突变潜力需要快速有效的DNA修复。BER酶如何协调其活性以解决8-oxoG损伤,同时限制细胞毒性BER中间体传播基因组不稳定性仍不清楚。在这里,我们使用单分子福斯特共振能量转移(smFRET)和整体水平技术来表征对于8-oxoG修复重要的连续BER酶的活性和相互作用。除了表征人类8-氧代鸟嘌呤糖基化酶1(hOGG 1)的损伤搜索和加工机制外,我们的数据支持hOGG 1,受损的DNA底物和人类AP内切核酸酶1(APE 1)之间存在三元复合物。我们的研究结果表明,hOGG 1是积极取代其脱碱基位点含有产品的蛋白质-蛋白质相互作用与APE 1,以确保及时修复受损的DNA。
Base excision repair (BER) is the primary pathway by which eukaryotic cells resolve single base damage. One common example of single base damage is 8-oxo-7,8-dihydro-2′-deoxoguanine (8-oxoG). High incidence and mutagenic potential of 8-oxoG necessitate rapid and efficient DNA repair. How BER enzymes coordinate their activities to resolve 8-oxoG damage while limiting cytotoxic BER intermediates from propagating genomic instability remains unclear. Here we use single-molecule Förster resonance energy transfer (smFRET) and ensemble-level techniques to characterize the activities and interactions of consecutive BER enzymes important for repair of 8-oxoG. In addition to characterizing the damage searching and processing mechanisms of human 8-oxoguanine glycosylase 1 (hOGG1), our data support the existence of a ternary complex between hOGG1, the damaged DNA substrate, and human AP endonuclease 1 (APE1). Our results indicate that hOGG1 is actively displaced from its abasic site containing product by protein-protein interactions with APE1 to ensure timely repair of damaged DNA.
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