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Implicit Solvent with Explicit Ions Generalized Born Model in Molecular Dynamics: Application to DNA.

Egor S Kolesnikov1, Yeyue Xiong2, Alexey V Onufriev3

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We developed GBION, a new model for simulating biomolecules with explicit ions in implicit solvent. This method accurately predicts ion distributions around DNA and accelerates conformational exploration, revealing novel DNA condensation behavior.

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Area of Science:

  • Computational chemistry
  • Biophysics
  • Molecular dynamics

Background:

  • The ion atmosphere around charged biomolecules like nucleic acids significantly impacts their behavior.
  • Accurate simulation of these ions is computationally demanding with traditional explicit solvent models.

Purpose of the Study:

  • To develop an efficient computational model for simulating biomolecules with explicit ions in an implicit solvent framework.
  • To investigate the dynamics and interactions of ions around DNA using this novel model.

Main Methods:

  • Development of the Generalized Born Implicit Solvent/Explicit Ions (GBION) model, incorporating modified solute-ion and ion-ion interactions.
  • Implementation of GBION in the AMBER package for atomistic molecular dynamics (MD) simulations.
  • Microsecond-scale MD simulations of double-stranded DNA with monovalent (Na+, K+) and trivalent (CoHex3+) counterions.

Main Results:

  • GBION accurately predicts counterion distributions around DNA, showing good agreement with experimental data, explicit water simulations, and Manning condensation theory.
  • Ion concentration deviations from explicit solvent models are within 1 kBT, comparable to established explicit water models.
  • Simulations with GBION exhibit significantly faster ion conformational exploration (over 2 orders of magnitude) with minimal computational overhead compared to implicit Generalized Born (GB) models.
  • The model revealed an unexpected DNA condensation "stacking" mode induced by trivalent counterions (CoHex3+).

Conclusions:

  • The GBION model offers a computationally efficient and accurate approach for simulating ion-biomolecule interactions.
  • This method facilitates the study of complex biomolecular phenomena, such as DNA condensation, by enabling faster exploration of conformational space.
  • GBION provides a valuable tool for advancing our understanding of nucleic acid dynamics and interactions in solution.