在C2'-原子抽象后,快速RNA链分裂
Rakesh Paul1, Marc M Greenberg
1Department of Chemistry, Johns Hopkins University , 3400 North Charles Street, Baltimore, Maryland 21218, United States.
Journal of the American Chemical Society
|January 13, 2015
概括
在暴露于辐射后,C2'-核酸激素会导致RNA中直接链断裂. 这解释了与DNA相比,RNA对电离辐射损伤的易感性更高.
科学领域:
- 生物化学 生物化学
- 辐射化学 辐射化学
- 分子生物学分子生物学
背景情况:
- C2 eal-cdot-核酸基因被认为是RNA链断裂形成中的中间体.
- 众所周知,RNA比DNA更容易受到电离辐射的影响.
研究的目的:
- 为了研究由C2 eal-cdot-核酸基介导的RNA中直接链断裂形成的机制.
- 将RNA的链分裂化学与DNA的链分裂化学进行比较.
主要方法:
- 在单链和双链RNA中生成uridin-2 eal-cdot-yl基因 (1),使用基前体的光解.
- 通过C3 eal-cdot-carbon-oxygen键的异质裂解来研究线条断裂的形成.
- 竞争性实验涉及O2或β-mercaptoethanol捕获基1的实验.
主要成果:
- 在RNA中直接链断裂的结果是C3 eal-cdot-碳-氧键的异质裂解.
- 酸盐的去除和 uracil 的损失不与链裂变竞争,表明快速裂变动力学 (>10(6) s(-1)).
- 生成的uridin-2 eal-cdot-yl基因化学反应解释了RNA比DNA更容易发生链分裂.
结论:
- C2 eal-cdot-核酸基是电离辐射引起的直接RNA链断裂的关键中间体.
- 快速的C3 eal-cdot-碳-氧键裂变是链裂变的主要途径.
- 这种机制解释了RNA和DNA之间观察到的辐射敏感性差异.
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