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在蛋白质折叠和展开反应过程中,二次结构变化可能发生分散而不是模块化
Pooja Malhotra1, Jayant B Udgaonkar1
1National Centre for Biological Sciences, Tata Institute of Fundamental Research , Bengaluru 560065, India.
Journal of the American Chemical Society
|April 21, 2016
概括
蛋白质的折叠是一个分散的,非同步的过程,即使蛋白质的折叠似乎是等级的. 这项研究揭示了蛋白质结构分解和组装的细分特征.
科学领域:
- 生物化学
- 结构生物学
- 蛋白质动力学
背景情况:
- 了解蛋白质折叠对于解读生物过程至关重要.
- 蛋白质的合作形态变化是由结合稳定相互作用驱动的.
- 同时测量全球合作性和整合性结构是一项挑战.
研究的目的:
- 研究蛋白质折叠中的合相互作用的结构基础.
- 描述二次结构部分的合作性.
- 阐明蛋白质结构分解和组装的机制.
主要方法:
- 用交换 (HX) 质谱来研究小蛋白质单蛋白.
- 在结构开放速度限制的条件下进行了HX.
- 确定了各个细分市场的结构开放率和合作率.
主要成果:
- 骨干结网络以扩散,异步的方式解体.
- 特定地点的短暂开放率显示出一个层次化的展开过程.
- 展开的动力学是指数的,尽管结构拆解的扩散性质.
结论:
- 蛋白质展开是一个分散和异步的过程在脊柱键的水平.
- 层次的展开动力学源于二级和三级结构动力学的相互作用.
- 蛋白质折叠遵循相反的序列,以非合作,扩散和异步的方式发生.
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