推进绑定亲和度计算:一种非平衡模拟方法,用于计算相对绑定自由能量在有被困水的系统中
Swapnil Wagle1, Christopher I Bayly2, David L Mobley1,3
1Department of Pharmaceutical Sciences, University of California, Irvine, California 92697, United States.
Journal of chemical theory and computation
|July 30, 2025
概括
计算蛋白质 - 配体结合的自由能量 (RBFE) 是"被困"的水分子具有挑战性的. 本研究介绍了一种非平衡切换 (NES) 方法,用于准确的RBFE计算,提供了一个计算成本低廉的替代方案.
科学领域:
- 计算化学是一种计算化学.
- 分子动力学分子动力学
- 生物物理学的生物物理.
背景情况:
- 蛋白质连接体复合体的形成通常涉及从结合部位的水位移.
- 在某些情况下,水分子仍然存在,稳定了复杂和复杂的结合自由能量计算.
- 标准方法与"被困"的水进行斗争,需要增强的采样,这可能耗时,并产生不一致的结果.
研究的目的:
- 开发一种高效,准确的方法来计算"被困"水分子的蛋白质-连接体系统中的相对结合自由能量 (RBFE).
- 为了解决现有的增强采样技术在模拟过程中处理水的重新排列方面的局限性.
- 为水分子调解联体-蛋白相互作用的系统提供可靠的计算方法.
主要方法:
- 开发了一种新型的非平衡切换 (NES) 方法,用于在被困水的存在下计算RBFEs.
- 该协议要求对被困水的位置有事先的了解,并使用三个连续的NES开关进行连接物转换.
- 该NES开关顺序应用约束,转换连接体,然后在蛋白质结合部位内移除约束.
主要成果:
- 该NES方法准确地估计了八个涉及被困水位移的系统的RBFE,在实验值的1.1 kcalmol-1的范围内取得结果.
- 与RBFE估计相关的统计错误始终低于0.4 kcal mol-1.
- 模拟显示了通过利用分布式计算资源有效计算RBFE.
结论:
- 本次介绍的NES方法为RBFE计算提供了一个计算成本低廉且准确的替代方案,用于有被困水域的系统.
- 这种方法克服了传统的增强采样方法对这些具有挑战性的系统的采样限制.
- 这些发现有助于在介导水分子的存在下更可靠地预测连接体结合亲和力.
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