来自稀密中间体原子分辨率结构的FF域折叠通路中的非活性相互作用:一个NMR放松分散研究
Dmitry M Korzhnev1, Robert M Vernon, Tomasz L Religa
1Department of Molecular Genetics, The University of Toronto, Toronto, Ontario M5S 1A8, Canada.
Journal of the American Chemical Society
|June 7, 2011
概括
FF域蛋白的L24A突变体表现出具有广泛非原生接触的折叠中间体. 这些相互作用减缓了向原生状态的过渡,影响了蛋白质折叠动态.
科学领域:
- 蛋白质折叠的动态 蛋白质折叠的动态
- 生物分子NMR光谱学
- 结构生物学是结构生物学.
背景情况:
- 全螺旋式蛋白质可以通过快速形成紧的中间体来折叠.
- 研究短暂的,人口较少的折叠中间体在实验上具有挑战性.
- FF域是一个用于研究蛋白质折叠路径的模型系统.
研究的目的:
- 描述FF领域的一个折叠中间体的结构和动态.
- 调查非原生相互作用在L24A突变的折叠途径中的作用.
- 了解从中间状态到原生状态的较慢过渡.
主要方法:
- 核磁共振 (NMR) 光谱学,特别是卡尔-普尔塞尔-梅布姆-吉尔 (CPMG) 放松分散实验.
- 测量骨干化学转移和胺键向量方向.
- 原子分辨率结构建模使用NMR衍生的束.
主要成果:
- 这种L24A突变物形成了一个折叠的中间体,具有广泛的非本地接触,超过了野生类型的接触.
- 尽管与原生状态的结构相似,但中间体含有重要的非原生相互作用.
- 这些非本地接触者的存在解释了较慢的毫秒时间尺度过渡到本地构造.
结论:
- 折叠中间体内的非活性相互作用显著阻碍了最终的折叠步骤.
- L24A突变通过增加中间的非本地接触者的种群和稳定性来减缓蛋白质折叠.
- 了解这些中间状态对于破译复杂的蛋白质折叠机制至关重要.
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