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Introducing Charge Hydration Asymmetry into the Generalized Born Model.

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Charge hydration asymmetry (CHA) is now accounted for in solvation free energy calculations with the new charge hydration asymmetric-generalized Born (CHA-GB) approximation. This improved model enhances accuracy for molecular simulations, offering better predictions for chemical systems.

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Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Physical chemistry

Background:

  • Standard linear response continuum electrostatics models neglect charge hydration asymmetry (CHA).
  • CHA, the non-invariance of solvation free energy upon solute charge inversion, is crucial for accurate molecular simulations.
  • Existing models often fail to capture the nuances of CHA in solvation energy calculations.

Purpose of the Study:

  • To introduce the charge hydration asymmetric-generalized Born (CHA-GB) approximation, incorporating CHA into the generalized Born (GB) model.
  • To improve the accuracy of continuum solvation models by accounting for CHA.
  • To develop a more robust and transferable set of atomic radii for solvation calculations.

Main Methods:

  • Developed the CHA-GB approximation by adding an analytical correction to the GB equation to quantify CHA.
  • Validated CHA-GB against explicit water free energy calculations for charge-inverted molecular bracelets.
  • Tested CHA-GB on diverse sets of neutral molecules and amino acid analogs, comparing results against the canonical GB model and explicit solvation energies.

Main Results:

  • CHA-GB closely reproduces significant variations in CHA observed in explicit water models.
  • CHA-GB demonstrates a ~40% improvement in accuracy over the canonical GB model for electrostatic solvation free energies.
  • Achieved root mean square errors of 0.88 kcal/mol for neutral molecules and 0.81 kcal/mol for amino acid analogs with CHA-GB.
  • Introduced a novel dielectric boundary definition and a new set of intrinsic atomic radii optimized for CHA-GB, showing better transferability.

Conclusions:

  • The CHA-GB approximation effectively incorporates the critical effect of charge hydration asymmetry into continuum solvation models.
  • CHA-GB offers significantly enhanced accuracy compared to the standard GB model, approaching the performance of more complex methods.
  • The newly developed atomic radii for CHA-GB exhibit improved physical meaningfulness and transferability across different molecular classes.