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Estimating the Temperature Dependence of Peptide Folding Entropies and Free Enthalpies from Total Energies in Molecular Dynamics Simulations

机译:从分子动力学模拟中的总能量估算肽折叠熵和自由焓的温度依赖性

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摘要

The temperature dependence of thermodynamic quantities, such as heat capacity, entropy and free enthalpy, may be obtained by using wellknown equations that relate these quantities to the enthalpy of the molecular system of interest at a range of temperatures. In turn, the enthalpy of a molecular system can be estimated from molecular dynamics simulations of an appropriate model. To demonstrate this, we have investigated the temperature dependence of the enthalpy, heat capacity, entropy and free enthalpy of a system that consists of a bheptapeptide in methanol and have used the statistical mechanics relationships to describe the thermodynamics of the folding/unfolding equilibrium of the peptide. The results illustrate the power of current molecular simulation force fields and techniques in establishing the link between thermodynamic quantities and conformational distributions.
机译:热力学量(例如热容量,熵和自由焓)的温度依赖性可以通过使用众所周知的方程式获得,这些方程将这些量与感兴趣的分子系统在一定温度范围内的焓相关。反过来,可以从适当模型的分子动力学模拟中估算分子系统的焓。为了证明这一点,我们研究了由甲醇中的七肽组成的系统的焓,热容量,熵和自由焓的温度依赖性,并使用统计力学关系来描述该化合物折叠/展开平衡的热力学。肽。结果说明了当前分子模拟力场和技术在建立热力学量和构象分布之间的联系方面的力量。

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