在变质剂混合物中的未折叠蛋白质的崩
Zhen Xia1, Payel Das, Eugene I Shakhnovich
1Computational Biology Center, IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA.
Journal of the American Chemical Society
|October 13, 2012
概括
在尿素中添加第二种变质剂,如化甘 (GdmCl),会意外地导致蛋白质崩. 这种蛋白质崩是由疏水性残留物埋葬和蛋白质表面附近变化的变质剂相互作用驱动的.
科学领域:
- 蛋白质动力学 蛋白质动力学
- 生物物理化学 生物物理化学
- 计算生物学是一种计算生物学.
背景情况:
- 尿素和化 guanidinium (GdmCl) 是常见的蛋白质变质剂.
- 蛋白质通常在单个变质剂的存在下展开和延伸.
研究的目的:
- 在混合变质剂环境中研究蛋白质构造变化.
- 为了阐明由变质剂混合物引起的蛋白质崩背后的机制.
主要方法:
- 原子学分子动力学模拟.
- 蛋白质构成组合的分析.
- 统计力学建模.统计力学建模.
主要成果:
- 蛋白质 (蛋白溶酶,蛋白质L) 在尿素/GdmCl混合物中崩.
- 崩与可溶性降低和非原生疏水性相互作用的增加有关.
- GdmCl和尿素在蛋白质表面附近积聚,形成一个拥挤的局部环境.
结论:
- 混合变质剂可以诱导蛋白质崩,与进一步展开的预期相反.
- 蛋白质崩是由疏水性残留物埋葬和改变的变质剂-蛋白质相互作用驱动的.
- 模拟和分析模型解释了崩机制.
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