瓜尼迪尼可以导致和防止生物大分子的疏水崩
Jan Heyda1,2, Halil I Okur, Jana Hladílková3,4
1Institut für Weiche Materie und Funktionale Materialien, Helmholtz-Zentrum Berlin für Materialien und Energie , Hahn-Meitner Platz 1, 14109 Berlin, Germany.
Journal of the American Chemical Society
|January 6, 2017
概括
关尼 (Gnd+) 盐对弹性样多 (ELP) 的稳定性产生不同的影响,这取决于对抗离子. 良好水合的离子通过耗尽稳定了崩状态,而其他如SCN-可以通过改变Gnd+相互作用来稳定或破坏稳定.
科学领域:
- 生物物理化学
- 聚合物科学
- 化学物理
背景情况:
- 弹性类聚 (ELP) 是无电荷的热敏聚合物,表现出不同的崩和未崩状态.
- (Gnd+) 盐是已知的蛋白质变质剂,但它们影响聚合物稳定的精确分子机制是复杂的.
- 了解盐对聚合物构成的影响对于生物材料和药物输送的应用至关重要.
研究的目的:
- 阐明瓜尼尼 (Gnd+) 盐与不同的对抗离子对弹性 (ELP) 构成的稳定性产生影响的分子机制.
- 调查阴离子水合和特定的离子-聚合物相互作用在ELP崩或稳定中的作用.
- 为瓜尼尼盐的脱能力提供机械基础.
主要方法:
- 福里埃变换红外光谱和相位过渡测量.
- 通过分子计算机模拟.
- 热力学模型
主要成果:
- (Gnd+) 离子的作用高度依赖于对抗离子.
- 良好水的离子 (例如,SO4^2-) 通过排除体积效应促进ELP的崩,从聚合物接口中耗尽Gnd+.
- 在低度下,SCN-通过Gnd+交叉连接ELP链来稳定崩,但在高度 (> 1.5M) 时,通过防止交叉连接来破坏其稳定. 在所有度下,GndCl稳定了未崩的状态.
结论:
- 瓜尼 (Gnd+) 盐对ELP稳定性的作用有着不同的机制,由对抗离子决定.
- 阳离子特性 (水合,结合亲和力) 调节Gnd+分离和相互作用,导致ELP的三种结构稳定性.
- 这项研究阐明了瓜尼尼盐多功能蛋白质变性活性的分子基础.
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