展开与折叠tRNA的动态:静电相互作用的作用
Joon Ho Roh1, Madhu Tyagi, R M Briber
1Department of Materials Science and Engineering, University of Maryland, College Park, Maryland, USA. rohmio1973@gmail.com
Journal of the American Chemical Society
|September 23, 2011
概括
离子 (Mg2+) 增强了水合转移RNA (tRNA) 的动态,同时稳定了它的结构. 这种效应源于改进的电荷选,与折叠状态更为刚性的蛋白质不同.
科学领域:
- 生物物理学的生物物理.
- 结构生物学 结构生物学
- 分子动力学分子动力学
背景情况:
- RNA动态对于生物功能至关重要,例如连接体识别和催化.
- 了解RNA结构和内部运动之间的关系是解读其作用的关键.
研究的目的:
- 研究离子 (Mg2+) 对水合转移RNA (tRNA) 动态的影响.
- 为了比较折叠与展开的tRNA的动态,并将其与多电解质行为联系起来.
主要方法:
- 准弹性中子散射 (QENS) 光谱法被用来探测原子运动.
- 分析包括原子平均平方位移,放松时间,持久长度和移动原子的分数.
主要成果:
- Mg2+显著增加了水合tRNA的皮秒到纳秒动态,同时稳定了其折叠结构.
- 未折叠的tRNA表现出比折叠的tRNA更大的刚性,这种现象也在硫聚烯中观察到.
- 在Mg2+处理的tRNA中观察到的动态归因于多电解质的增强电荷选.
结论:
- RNA动态受到静电环境的深刻影响,特别是电荷选效应.
- 与蛋白质不同,RNA的折叠状态可以表现出增加的内部动态,与蛋白质中观察到的刚性愈合状态相反.
- 当地的水运动也在RNA动态中发挥作用,与静电相互作用一起.
相关概念视频
Protein Folding
Overview
Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
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Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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Molecular Chaperones and Protein Folding
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...


