由分子聚合和水动力学驱动的微观异质性在水性奥斯莫利特溶液中的水动力学
Jiwon Seo1, Ravi Singh1, Jun-Ho Choi1
1Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
Journal of chemical information and modeling
|January 30, 2025
概括
三甲基胺N氧化物 (TMAO) 和三甲基尿素 (TMU) 不同地影响水的动态. 在TMU中,你会看到TMU.
科学领域:
- 物理化学 物理化学
- 生物物理化学 生物物理化学
- 计算化学计算化学
背景情况:
- 奥斯莫利特通过直接相互作用或通过改变水的结构和动态来调节蛋白质的稳定性.
- 了解这些机制对于从生物化学到药物开发等领域至关重要.
研究的目的:
- 为了研究二进制的奥斯莫利特-水混合物的水动力学.
- 阐明分子聚合和溶液异质性在奥斯莫利特功能中的作用.
- 要区分保护性透物 (如TMAO) 和变质性透物 (如TMU) 之间的作用机制.
主要方法:
- 用分子动力学 (MD) 模拟来研究二进制的氧化物-水混合物.
- 图形理论分析和空间不均质测量 (h值) 用于量化溶液结构.
- 分析奥斯莫利特和水分子之间的键寿命.
主要成果:
- 三甲基尿素 (TMU) 很容易形成聚合物,导致TMU与水混合物的微观异质性.
- TMAO分子均分散,从而产生同质的TMAO-水混合物.
- 与同质的TMU-水混合物中的水分子相比,与同质的TMAO-水混合物相比,其转换和旋转运动受到的阻碍较小.
- 与TMAO相比,TMU表现出较弱的解体-水相互作用,促进了TMU-TMU和TMU-蛋白相互作用.
结论:
- 氧化物对蛋白质稳定性的作用包括直接的氧化物-蛋白质相互作用和水结构和动态的间接调节.
- 聚合行为和由此产生的溶液异质性是确定水动力学和溶剂有效性的关键因素.
- TMU的变质效应与其聚合和较弱的水相互作用有关,而TMAO的保护作用可能与其均分布和较强的水相互作用有关.
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