从分子动力学模拟中计算解离常数,对大压力波动进行校正 - - 水糖素对其基质甘油具有很高的亲和力
Md Mohsin1, Hans R Loja2, Liao Y Chen1
1Department of Physics, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
Biomolecules
|January 28, 2026
概括
分子动力学 (MD) 模拟显示了很大的压力波动,影响了连接体-蛋白结合亲和力. 基于统计热力学的新校正因子准确计算了甘油-水甘油结合亲和力,揭示了以前低估的高亲和力.
科学领域:
- 计算化学是一种计算化学.
- 生物物理学的生物物理.
- 分子建模分子建模
背景情况:
- 分子动力学 (MD) 模拟对于研究联体蛋白相互作用至关重要.
- 恒压模拟显示出显著的,人为的压力波动 (±100 bar).
- 这些波动在计算结合亲缘关系时引入了不准确性,特别是在联结蛋白系统中.
研究的目的:
- 为MD模拟开发基于统计热力学的校正因子.
- 为了弥补联结蛋白结合亲和度计算中的人工压力波动.
- 为了准确地确定糖醇与水糖的结合亲和力.
主要方法:
- 使用统计热力学推导一个校正因子.
- 对MD模拟数据的校正因子的应用.
- 进行四组MD模拟的甘油-水甘油系统 (AQP10,AQP3,AQP7,GlpF).
主要成果:
- 没有修正,甘油的表面亲和力被计算为非常低 (~1/M).
- 使用校正因子,糖醇的亲和力准确计算在1/mM和1/μM之间.
- 经过校正的亲和度表明甘油及其原生水甘油之间具有很高的结合亲和度.
结论:
- 一个新的校正因子有效地解决了MD模拟中的压力波动人工物.
- 甘油对其原生水甘油具有很高的亲和力,这与之前的发现相反.
- 这种方法提高了in silico结合亲和度预测的准确性.
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