聚胺吸附剂与AP位点:与DNA聚合酶和AP内核酶的相互作用
Anna V Yudkina1, Margarita M Amanova1, Dmitry O Zharkov1,2
1SB RAS Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Avenue, Novosibirsk 630090, Russia.
Chemical research in toxicology
|January 7, 2025
概括
生物多氨酸在DNA的apurinic/apyrimidinic (AP) 位点形成 adducts,可能阻断DNA复制和转录. 虽然一些酶可以修复这些添加物,但修复通常是缓慢的,突出显示了一种新的DNA损伤途径.
科学领域:
- 分子生物学分子生物学
- 生物化学 生化学
- 遗传学 是一个遗传学.
背景情况:
- 生物多氨酸 (精子胺,精子胺,氨酸) 是大量的细胞内化合物.
- 多氨酸与DNA的阿布里尼克/阿比里米尼克 (AP) 位点发生反应,形成共价中间体.
- 这些AP位点添加物可能会干扰DNA复制和转录.
研究的目的:
- 调查与精氨酸和精氨酸的AP点 adducts的形成和持久性.
- 评估这些添加物对DNA聚合酶的影响.
- 确定聚胺-DNA添加物的修复途径.
主要方法:
- 化捕获技术,以检测AP点 adducts.
- 在体外测试中使用各种DNA聚合酶 (克莱诺片段,菌体RB69,人类聚合酶β和 κ).
- 通过特定的AP内核酶 (大肠杆菌内核酶IV,酵母 Apn1,人类APE1,大肠杆菌外核酶III) 进行检测修复.
主要成果:
- 精子和精子胺在DNA AP位点形成持久的附加物.
- 内部AP部位 adducts强烈阻断DNA聚合酶和直接罕见的dAMP合并.
- 内 adducts 是慢慢地修复了大肠杆菌内核酶IV和酵母Apn1,但不是人类APE1或大肠杆菌外核酶III.
- 3'-终端添加物是所有测试的AP内核酶的极酶活动的基质.
结论:
- 多氨酸可以在DNA AP位点形成稳定的附加物,对DNA代谢构成潜在威胁.
- 这些添加物对DNA聚合酶具有显著的阻碍,影响复制效率.
- 不同的修复效率表明,特定的酶途径参与解决聚胺诱导的DNA损伤.
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