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Between algorithm and model: different Molecular Surface definitions for the Poisson-Boltzmann based electrostatic

Sergio Decherchi1, José Colmenares, Chiara Eva Catalano

  • 1Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, via Morego, 30, 16163 Genova, Italy.

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Summary

This study compares the skin and blobby molecular surfaces for biomolecular modeling. The skin surface shows promise as an efficient alternative to the Connolly-Richards surface for electrostatic calculations.

Keywords:
Blobby SurfaceConnolly SurfaceMolecular SurfacePoisson-BoltzmannSkin Surface

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Area of Science:

  • Computational chemistry
  • Biomolecular modeling
  • Computational physics

Background:

  • Defining physically sound and computationally efficient molecular surfaces is crucial for implicit solvent modeling and molecular graphics.
  • The Connolly-Richards surface is widely used but has limitations.

Purpose of the Study:

  • To evaluate the blobby and skin molecular surfaces as alternatives to the Connolly-Richards surface for electrostatic computations.
  • To assess their suitability based on geometric properties and agreement with explicit solvent simulations.

Main Methods:

  • Geometric analysis of surface differentiability and area continuity.
  • Development of software tools for skin surface integration into Poisson-Boltzmann solvers (DelPhi).
  • Comparison with explicit solvent simulations.

Main Results:

  • Geometric analysis favors the skin surface over the blobby surface.
  • An unexpected relationship was found between surface non-connectedness and area dependence.
  • The skin surface demonstrated comparable performance to the Connolly surface in reproducing explicit solvent results.

Conclusions:

  • The skin surface is a viable and potentially advantageous alternative to the Connolly-Richards surface for electrostatic calculations in biomolecular modeling.
  • Further investigation into the geometric properties of molecular surfaces can improve computational efficiency and accuracy.