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预测水在蛋白质接口的冷-EM结构的MD-超量化学潜力从水
Qinfang Sun1, Sriram Aiyer2, Avik Biswas3
1Center for Biophysics and Computational Biology, Temple University, Philadelphia, PA, 19122; Department of Chemistry, Temple University, Philadelphia, PA, 19122.
Biophysical journal
|January 29, 2026
概括
预测水分子在蛋白质接口的位置是具有挑战性的. 这项研究使用分子动力学模拟和多余的化学潜力,准确地将水放置在冷电子显微镜图中,改善结构生物学见解.
科学领域:
- 结构生物学 结构生物学
- 计算生物学 计算生物学
- 生物物理学的生物物理.
背景情况:
- 精确预测水分子在蛋白质接口的位置对于理解蛋白质功能和相互作用至关重要.
- 目前用于冷电子显微镜 (cryo-EM) 地图中的水位的方法在准确性和可靠性方面面临挑战.
研究的目的:
- 开发一种新的计算方法,以提高水分子在冷电磁图中的位置的准确性.
- 为了利用统计热力学特征,特别是过剩的化学潜力,从分子动力学 (MD) 模拟来增强水位定位.
主要方法:
- 利用分子动力学 (MD) 模拟来计算水分子在蛋白质界面上的过剩化学潜力 (工作转移 - WT).
- 使用WT分析了水-蛋白相互作用与水-溶剂相互作用的热力学平衡.
- 将该方法应用于apoferritin作为基准系统,将预测的水位与蛋白质数据库 (PDB) 中实验确定的结构进行比较.
主要成果:
- 根据有利的化学潜能过剩 (WT) 预测的前100个水位中的85%是在实验确定的冷EM结构中发现的.
- 在前200个预测的水位中,70%与从冷EM数据中得出的PDB结构中观察到的位置有很强的相关性.
- 在没有实验约束的情况下进行的MD模拟显示了有利的WT值和冷EM地图中观察到的水位之间的强烈相关性.
结论:
- 开发的方法将多余化学潜力的MD模拟与冷EM数据集成在一起,显示出对精确的水位定位有很大的希望.
- 这种方法可以导致开发一种新的工具,用于水的放置和精细化在冷-EM研究.
- 在蛋白质接口上改进水网络的建模将促进对生物过程的理解.
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