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Generalized Born implicit solvent models for small molecule hydration free energies.

Martin Brieg1, Julia Setzler2, Steffen Albert2

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Implicit solvent models improve hydration free energy calculations. Optimized models with atom-type dependent surface tension coefficients match explicit solvent accuracy, enhancing molecular simulations.

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Physical chemistry

Background:

  • Hydration free energy estimation is crucial for molecular force field validation and understanding solvation.
  • Explicit solvent models offer high accuracy but are computationally expensive due to extensive sampling requirements.
  • Implicit solvent models, like Generalized Born with Solvent Accessible Surface Area (GBSA), reduce computational cost but often lack accuracy compared to explicit models.

Purpose of the Study:

  • To compare the performance of three implicit solvent models with varying nonpolar contributions and a generalized Born term for estimating hydration free energies.
  • To identify factors contributing to inaccuracies in current implicit solvent models.
  • To propose strategies for improving the accuracy of implicit solvent models.

Main Methods:

  • Evaluated three implicit solvent models with different nonpolar terms and a generalized Born term against experimental hydration free energies.
  • Focused on a minimal set of ten atom types and optimized parameters.
  • Analyzed the asymmetric behavior of water around charged atoms as a potential error source.

Main Results:

  • An implicit solvent model utilizing atom type-dependent surface tension coefficients for the nonpolar term, combined with an accurate generalized Born term and optimized parameters, performed best.
  • This optimized model achieved hydration free energy estimation accuracy comparable to the explicit TIP3P water model.
  • Asymmetric water behavior around oppositely charged atoms was identified as a significant error source for two of the evaluated implicit models.

Conclusions:

  • Optimized implicit solvent models, particularly those incorporating atom type-dependent surface tension, can achieve accuracy rivaling explicit solvent models for hydration free energy estimation.
  • Addressing the asymmetric solvation of charged species is key to further improving implicit solvent model performance.
  • The findings provide a pathway for enhancing generalized Born based implicit solvent models in molecular simulation packages.