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The SAMPL4 hydration challenge: Evaluation of partial charge sets with explicit-water molecular dynamics simulations

机译:SAMPL4水合挑战:使用显式水分子动力学模拟评估部分电荷集

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摘要

We used blind predictions of the 47 hydration free energies in the SAMPL4 challenge to test multiple partial charges models in the context of explicit solvent free energy simulations with the GAFF force field. One of the partial charge models, IPolQ-Mod, is a fast continuum solvent-based implementation of the IPolQ approach. The AM1-BCC, RESP and IpolQ-Mod approaches all perform reasonably well (R2 > 0.8), while Vcharge, though faster, gives less accurate results (R2 of 0.5). The AM1-BCC results are more accurate than those of RESP for tertiary amines and nitrates, but the overall difference in accuracy between these methods is not statistically significant. Interestingly, the IPolQ-Mod method is found to yield partial charges in very close agreement with RESP. This observation suggests that the success of RESP may be attributed to its fortuitously approximating the arguably more rigorous IPolQ approach.
机译:我们使用SAMPL4挑战中47种水合自由能的盲目预测在GAFF力场的显式无溶剂能量模拟的背景下测试了多个部分电荷模型。 IPolQ-Mod是部分收费模型之一,是IPolQ方法基于溶剂的快速连续实现。 AM1-BCC,RESP和IpolQ-Mod方法的性能都相当好(R 2 2 )。 0.5)。对于叔胺和硝酸盐,AM1-BCC的结果比RESP的结果更准确,但是这些方法之间的准确度总体差异在统计学上并不显着。有趣的是,发现IPolQ-Mod方法产生的部分电荷与RESP非常接近。该观察结果表明,RESP的成功可能归因于它偶然地逼近了可能更为严格的IPolQ方法。

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