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Merging Implicit with Explicit Solvent Simulations: Polyethylene Glycol.

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We developed an accurate polyether force field for implicit solvent molecular dynamics simulations. This new model accurately predicts conformations of polyethylene glycol (PEG) and is 100 times faster than explicit solvent simulations.

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics Simulations
  • Force Field Development

Background:

  • Implicit solvent (IS) models often fail to accurately capture solute-solute interactions, leading to overly compact structures in molecular dynamics (MD) simulations.
  • Existing IS models using generalized Born (GB) electrostatics with positive surface energy terms were found to produce compact equilibrium structures for polyethylene glycol (PEG).
  • Accurate simulation of PEG conformations requires careful force field adjustments, particularly for van der Waals (vdW) interactions and torsional potentials.

Purpose of the Study:

  • To construct an accurate polyether force field for implicit solvent (IS) molecular dynamics (MD) simulations.
  • To match the local and global conformations of 1,2-dimethoxy-ethane (DME) and polyethylene glycol (PEG) in IS simulations with explicit solvent (ES) results.
  • To improve the efficiency of IS models for exploring the conformational space of PEG.

Main Methods:

  • Developed and optimized a CHARMM-based ether force field for IS MD simulations.
  • Utilized 1 μs of explicit solvent (ES) MD simulation data of PEG based on the CHARMM35 ether force field for force field adjustments.
  • Investigated the generalized Born with simple switching (GBSW) model, adjusting surface energy terms and vdW interactions, and refining torsion potentials and Coulomb interactions.

Main Results:

  • The developed IS force field accurately reproduces local and global conformations of DME and PEG, matching ES simulation data.
  • Adjustments included reducing attractive vdW interactions and modifying torsion potentials and 1-4/1-5 Coulomb interactions.
  • The IS GBSW model significantly enhances simulation efficiency, requiring 100 times less CPU time compared to ES models for PEG conformational exploration.

Conclusions:

  • A validated polyether force field for IS MD simulations has been established, suitable for both dimeric and polymeric ethylene glycol.
  • The optimized IS model provides a computationally efficient alternative to ES simulations for studying PEG conformations.
  • The efficiency gain is attributed to the absence of solvent viscosity and other factors in IS models.