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Updated: Jun 23, 2025

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用β-L-核酸测试DNA损伤识别的符合性限制

Anna V Yudkina^1,2, Daria V Kim¹, Timofey D Zharkov¹

¹Siberian Branch of the Russian Academy of Sciences Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia.

International journal of molecular sciences

|June 19, 2024

概括

合成的L-DNA构建块 (βLdNs) 对酶具有抗性,在生物感知中显示出潜力. 虽然大多对DNA聚合酶和修复酶没有指导作用,但有一些例外存在,特别是在人类细胞中.

科学领域:

生物化学生物化学
分子生物学分子生物学
合成生物学合成生物学

背景情况:

自然DNA使用β-D-脱氧核酸.
合成β-L-脱氧核酸 (βLdNs) 形成L-DNA,耐核酶,可用于生物感知和纳米技术.
在D-DNA中对βLdN的酶性处理尚不清楚.

研究的目的:

研究βLdN的模板性质,用于DNA聚合酶.
评估基切除修复酶从DNA中去除βLdN的能力.
确定人类细胞中βLdNs的修复能力.

主要方法:

使用各种DNA聚合酶 (克莱诺片段,DNA聚合酶 κ,RB69DNA聚合酶,DNA聚合酶β) 进行酶检测.
测试基因切除修复酶 (DNA糖基酶,AP内核酶).
在人体细胞中进行报告器等离子体测定,以评估体内修复.

主要成果:

克莱诺片段被βLdNs阻断;DNA聚合酶 κ无误地绕过它们.
RB69 DNA聚合酶和DNA聚合酶β处理的βLdNs作为非指令性,DNA聚合酶β显示无错误地在空隙基板上合并.
基因糖酶和AP内核酶没有处理βLdN; 胺βLdN在人体细胞中具有抗修复性,而纯氨酸βLdN显示部分修复.

结论:

βLdNs是独特的DNA修饰,主要具有对酶的非指导性.
特定的DNA聚合酶对βLdN表现出不同的反应,包括无错误的绕过和整合.
在人类细胞中,βLdNs表现出对基切除修复的抗性,在基和基中观察到差异修复.

关键词:

在AP的内核酶中,基因糖基酶酶是DNA糖基酶酶的组成部分.这种DNA聚合酶是DNA聚合酶.修复DNA的修复DNA的修复转化合成的转化合成在 β-L-核酸中.

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