在RNA - 配体结合过程中单个核酸的形态重排是以速率差异化
Marina Frener1, Ronald Micura1
1Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck , 6020 Innsbruck, Austria.
Journal of the American Chemical Society
|March 15, 2016
概括
这项研究揭示了特定RNA (preQ1 рибо开关胺基) 结合对象时核基如何改变形状的显著差异. 这些形状变化以不同的速度发生,影响基因调节.
科学领域:
- 分子生物学
- 生物化学
- 核糖核酸生物学
背景情况:
- 核糖突变是控制基因表达的RNA调节元件.
- 来自Thermoanaerobacter tengcongensis的preQ1类I рибо开关体是研究配体识别的模型系统.
- 了解RNA结构动态对于解读基因调节机制至关重要.
研究的目的:
- 在 preQ1 рибо交换机体中识别连接体时核基结构重组的速率差异化.
- 阐明这些动态在RNA - 连接的诱导适合机制中的作用.
- 将结构适应与基因表达的下游影响相关联.
主要方法:
- 使用2ApFold方法来测量形状重排率.
- 使用光光谱在riboswitch变体与特定位置的2-aminopurine (2Ap) 替代.
- 分析了核基结合时的动力差异.
主要成果:
- 在个体核基形态适应之间观察到22倍的率差异.
- 确定了最快的重排在连接体结合部位和最慢的远端堆叠核酸.
- 证明了对局部结构元素的适应时间范围广泛,以应对连接.
结论:
- 在 preQ1 рибо交换机上,采用了一种诱导适合机制,涉及具有明显重新排列速率的核基.
- 这些速率差异有助于生成基因调节的结构信号.
- 这些发现提供了RNA - 连接体相互作用的动态性及其功能后果的见解.
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