在点击链接模板上的易发生错误的DNA合成
A V Endutkin1, A O Yakovlev1,2, T D Zharkov1
1Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia.
Doklady. Biochemistry and biophysics
|August 28, 2024
概括
点击结合在DNA中产生三醇链接,该链接抵抗修复酶,但导致DNA聚合酶停滞或错误纳入基. 这表明点击结合可能会在定制基因合成过程中引发重大错误.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 合成生物学 合成生物学
背景情况:
- 点击结合是一种使用亚酸-基环添加的DNA片段连接方法.
- 它形成了一个4-甲基-1,2,3-三 (trz) 连接,取代了基键.
- 这种trz链接的生物兼容性和DNA修复相互作用在很大程度上是未知的.
研究的目的:
- 为了研究点击结合 (trz) 链接对DNA修复途径的影响.
- 评估各种DNA聚合酶在遇到trz链接时的行为.
- 通过trz链接来确定DNA合成的忠实性.
主要方法:
- 测试trz链接对人类和细菌内核酶的抗性.
- 使用Pfu,DNA聚合酶β,RB69聚合酶和Klenow片段评估DNA聚合酶停滞和绕过trz链接.
- 在trz链路中评估核酸错误结合的频率.
主要成果:
- 这种trz链接表现出对多个DNA修复内核酶的抗性.
- 观察到Pfu和DNA聚合酶β的显著聚合酶停滞.
- 体RB69聚合酶和Klenow碎片显示了绕道能力.
- 在除了DNA聚合酶β.除了所有聚合酶中检测到高率的dAMP错误整合.
结论:
- 这种trz链接对常见的DNA修复机制具有抗性.
- 点击结合可以导致显著的DNA聚合酶停滞和高频错误编码.
- 产生错误的可能性限制了点击结合在精确定制基因合成中的实用性.
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