蛋白质稳定通过宏分子拥挤通过度而不是度通过度
Michael Senske1, Lisa Törk, Benjamin Born
1Department of Physical Chemistry II, Ruhr-Universität Bochum , 44780 Bochum, Germany.
Journal of the American Chemical Society
|June 4, 2014
概括
大分子拥挤影响蛋白质稳定性不同于稀释溶液. 与预测相反,特定的溶解物,如葡萄糖和乳糖稳定蛋白质,但不稳定.
科学领域:
- 生物化学 生物化学
- 生物物理学的生物物理.
- 物理化学 物理化学
背景情况:
- 细胞内部是拥挤的环境,影响蛋白质的稳定性.
- 大分子拥挤通常通过热体积排除来解释.
- 了解这些影响对于蛋白质折叠和功能至关重要.
研究的目的:
- 研究各种可溶性物对蛋白质热展开的作用.
- 分析对蛋白质稳定性变化的体和体贡献.
- 挑战和完善现有的宏分子拥挤理论.
主要方法:
- 通过使用各种溶解物 (葡萄糖,德克斯,PEG,KCl,尿素) 研究了乌比奎的热展开.
- 通过计算热容量的温度依赖,分析了自由能量的变化.
- 与被排除体积理论的预测进行了比较.
主要成果:
- 观察到葡萄糖,德克斯和PEG的平稳定和平不稳定,与排除体积理论相矛盾.
- 发现德克斯及其单体葡萄糖具有类似的体稳定机制.
- 聚乙烯甘醇 (PEG) 主要是由于主导的热效应造成的不稳定.
结论:
- 在拥挤的环境中蛋白质的稳定性是复杂的,涉及和.
- 现有的排斥体积理论不能完全捕捉对蛋白质稳定性的共解效应.
- 提出了一种新的模型,根据它们对蛋白质稳定性的体贡献来分类溶解物效应.
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