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Revisiting Vacuum Simulations Using Modern Classical Protein Force Fields.

Vi Toan Lam1, Duy Phuoc Tran1

  • 1School of Life Sciences and Technology, Institute of Science Tokyo (formerly, Tokyo Institute of Technology), 2-12-1 Ookayama, Meguro-Ku, Tokyo 152-8550, Japan.

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Summary
This summary is machine-generated.

Modern biomolecular force fields show unclear performance in vacuum simulations. Inter-residue interactions, not CMAP or dihedral angles, significantly impact peptide sampling in vacuum, aiding future force field development.

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Area of Science:

  • Biomolecular simulations
  • Computational chemistry
  • Protein dynamics

Background:

  • Classical biomolecular force fields have been extensively improved for solution simulations.
  • Their performance in vacuum simulations, crucial for understanding intrinsic properties, remains less understood.

Purpose of the Study:

  • To compare the performance of recent modern biomolecular force fields in vacuum simulations.
  • To investigate the impact of force field components on peptide sampling and conformational space.

Main Methods:

  • Extensive replica exchange molecular dynamics (REMD) simulations were performed on nine peptides.
  • Quantum mechanical (QM) total energy calculations were used to validate simulation results.
  • Analysis included sampling conformations, principal component (PC) space, radius of gyration, and N-terminus to C-terminus distances.

Main Results:

  • The treatment of CHARMM-GUI CMAP (Correctional Maps) or dihedral angle functions did not significantly affect vacuum simulation sampling.
  • Inter-residue mainchain-side chain interactions were found to play important roles in vacuum simulations.
  • While not always dominant individually, the ff14SB force field cumulatively showed the highest sampling across all peptides studied.

Conclusions:

  • Inter-residue interactions are critical for accurate biomolecular force field performance in vacuum.
  • Current force fields may require refinement in modeling these interactions for improved transferability.
  • Findings provide insights for developing future universal and transferable biomolecular force fields.