Theoretical and Computational Chemistry

Bind3P: Optimization of a Water Model with Host-Guest Binding Data

Authors

Abstract

We report a water model, Bind3P (Version 0.1), which was obtained by using sensitivity analysis to readjust the Lennard-Jones parameters of the TIP3P model against experimental binding free energies for six host-guest systems, along with pure liquid properties. Tests of Bind3P against >100 experimental binding free energies and enthalpies for host-guest systems distinct from the training set show a consistent drop in the mean signed error, relative to matched calculations with TIP3P. Importantly, Bind3P also yields some improvement in the hydration free energies of small organic molecules, and preserves the accuracy of bulk water properties, such as density and the heat of vaporization. The same approach can be applied to more sophisticated water models that can better represent pure water properties. These results lend further support to concept of integrating host-guest binding data into force field parameterization.

Content

Thumbnail image of Bind3Pmain.pdf

Supplementary material

Thumbnail image of Bind3PSI.pdf
Bind3P-SI
Thumbnail image of Bind3Puncertainties.xlsx
Bind3P-uncertainties