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Microfluidic Mixers for Studying Protein Folding
Published on: April 10, 2012
通过模拟和实验揭示的Acyl-CoA结合蛋白折叠中的缓慢展开状态结构
Vincent A Voelz1, Marcus Jäger, Shuhuai Yao
1Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States.
Journal of the American Chemical Society
|July 4, 2012
概括
蛋白质折叠涉及复杂的途径,而不仅仅是简单的状态. 这项研究表明,未折叠的蛋白质中的残留结构形成缓慢,影响折叠动态和疾病机制.
科学领域:
- 生物物理学的生物物理.
- 计算生物学 计算生物学
- 分子生物学分子生物学
背景情况:
- 蛋白质折叠对于生物功能和理解疾病至关重要.
- 简单的实验模型和复杂的基于模拟的蛋白质折叠网络模型之间存在差异.
- 乙辅酶A结合蛋白 (ACBP) 是研究蛋白质折叠动态的一个模型系统.
研究的目的:
- 调和基于实验和模拟的蛋白质折叠模型.
- 调查展开状态结构的性质及其在ACBP折叠中的作用.
- 在微秒时间尺度上描述ACBP折叠的动力学和机制.
主要方法:
- 单分子福斯特共振能量转移 (smFRET) 与侧链突变发生.
- 超快的层流混合实验,用于微秒动力学.
- 对于展开状态动态的Trp-Cys火.
- 分子动力学 (MD) 模拟和马尔科夫状态模型 (MSM) 构建.
主要成果:
- 在ACBP的非化状态下,它呈现出紧的,对突变敏感的残留结构.
- 展开状态结构的形成发生在一个缓慢的时间尺度 (~100μs).
- 突变同样影响平衡和时间解析smFRET测量.
- MSM预测了复杂的超稳定状态,但没有明显的早期折叠中间体.
结论:
- ACBP折叠不是一个简单的两态过程,而是涉及慢慢地获得展开状态结构.
- 在ACBP折叠中的快速动态阶段归因于异质的展开状态动态,而不是一个受屏障限制的中间体.
- 这项研究将实验观测与蛋白质折叠的复杂网络模型相协调.
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