关于头 ribozyme 催化物的计算变异性研究
1BioMaPS Institute for Quantitative Biology and Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, USA.
Journal of the American Chemical Society
|September 4, 2010
概括
计算模拟揭示了头核糖酶 (HHR) 中的关键相互作用. 了解这些分子动力学有助于解释突变效应,并指导未来对这种重要的催化RNA的研究.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 计算化学的计算化学
背景情况:
- 头核糖酶 (HHR) 是一种小型催化RNA分子.
- 了解HHR催化活性的结构基础对于其研究至关重要.
研究的目的:
- 在HHR中计算调查突变在特定位置 (C3,G8,G5) 的影响.
- 用分子动力学模拟来解释实验观察到的突变效应.
主要方法:
- 进行了24次100n分子动力学模拟,对本地和突变的HHR进行模拟.
- 模拟了反应物和激活前体状态,包括去质子化G8:2'OH.
- 分析了沃森-克里克的基配对,键网络和基堆叠相互作用.
主要成果:
- 确定了沃森-克里克基配对 (G8-C3),键 (C17-G5) 和基堆叠 (G8-C1.1) 对于HHR活性站点结构和活动至关重要.
- 这些相互作用的破坏会对催化活性产生负面影响.
- 预测了C3U/G8D双突变的救援效应.
结论:
- 突变模拟需要足够的放松时间 (≥30 ns) 才能显现效应.
- 检查超出反应物状态的状态是解释催化活性结构中的突变效应所必需的.
- 这些发现提高了对实验突变效应的理解,并突出了对HHR活性位点完整性至关重要的保存特征.
相关概念视频
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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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In-vitro Mutagenesis
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