粗粒度水模型能否捕捉出疏水效应的关键物理特征?
Kuntal Ghosh1, Timothy D Loose1, Gregory A Voth1
1Department of Chemistry, Chicago Center for Theoretical Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, USA.
The Journal of chemical physics
|December 11, 2023
概括
具有三体相互作用的粗粒度 (CG) 水模型准确地捕获了疏水效应. 自下而上的CG模型显示出对疏水性的定量研究有希望,尽管-分解需要进一步研究.
科学领域:
- 计算化学计算化学
- 分子动力学分子动力学
- 软物质物理学 软物质物理学
背景情况:
- 粗粒度 (CG) 分子动力学对于研究复杂过程至关重要.
- 大多数CG力场中的双向潜能都在努力模拟像疏水效应这样的多体现象.
- 准确地表示疏水效应需要捕捉水的键网络中溶液诱导的变化.
研究的目的:
- 评估一站式CG水模型,以评估它们对水害虫周围溶剂环境的表现能力.
- 为了评估这些模型在计算中位力 (PMF) 对新联结的潜力时的准确性.
- 为了确定包括三体相互作用在CG水模型中的影响,用于疏水效应研究.
主要方法:
- 系统测试四个CG一站式水模型:简单的对式 (SP),自下而上的多体投射水 (BUMPer),单原子 (mW) 和机器学习的mW (ML-mW).
- 在SP模型中使用多尺度粗粒法.
- 分析结构相关性和新丹协会的PMF.
主要成果:
- 单原子 (mW) 模型捕获了结构相关性,但未能准确预测PMF能量.
- BUMPer模型表现出卓越的性能,准确地捕捉了结构相关性和PMF.
- 与BUM.Per相比,简单的双向 (SP) 模型显示了一些限制.
结论:
- 包括三体相互作用,隐式或显式,对于准确的CG水模型至关重要.
- 下向CG水模型适用于对疏水效应的定量研究.
- 需要进一步研究对水性协会PMFs的力-力分解精度.
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