通过单分子FRET和隐藏的马尔科夫模型揭示了复杂的RNA折叠动力学
Bettina G Keller1, Andrei Kobitski, Andres Jäschke
1Freie Universität Berlin , Institute of Chemistry and Biochemistry, Takustr. 3, 14195 Berlin, Germany.
Journal of the American Chemical Society
|February 27, 2014
概括
研究人员开发了一种新方法来分析单分子Förster共振能量转移 (smFRET) 数据,揭示了Diels-Alderase ribozyme的详细折叠路径和状态,受离子度的影响.
科学领域:
- 生物化学和分子生物学
- 结构生物学 结构生物学
- 生物物理学的生物物理.
背景情况:
- 了解催化RNA分子,如 ribozymes 的折叠动力学对于破译它们的生物功能至关重要.
- 单分子福斯特共振能量转移 (smFRET) 提供了对结构动态的洞察力,但需要复杂的分析方法.
- 痕迹依赖的背景强度可能会使smFRET数据的解释复杂化.
研究的目的:
- 为基于光子的单分子FRET数据开发一种先进的分析技术.
- 为了研究Diels-Alderase ribozyme的折叠动力学和构造状态.
- 阐明离子 (Mg2+) 在稳定 ribozyme 结构中的作用.
主要方法:
- 开发一个隐藏的马尔科夫模型和对smFRET数据分析的优化程序.
- 将跟踪依赖的背景强度校正纳入模型.
- 该方法应用于研究Diels-Alderase ribozyme折叠在不同的Mg2+度和结构中.
主要成果:
- 识别多种扩展 (低FRET) 和紧 (高FRET) 形态状态.
- 在不同的结构和Mg2+度中一致识别了五个不同的状态.
- 观察到结构通常会随着Mg2+度的增加而变得更紧,一些状态显示Mg2+依赖稳定 (三级折叠) 和一个Mg2+独立状态 (沃森-克里克基配对).
结论:
- 开发的隐藏马尔科夫模型在分析 ribozyme 折叠动力学方面提供了前所未有的细节.
- 迪尔斯-阿尔德拉斯 ribozyme 折叠涉及时间尺度的等级,从快速的三级结构波动 (ms) 到更慢的二级结构变化 (秒).
- 折叠路径是复杂的,涉及中间二级结构和三级和二级结构元素之间的动态过渡,由Mg2+调节.
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