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gmx_ffconv: A Fast, User-Friendly Semi-Automated All-Atom Force Field Converter for GROMACS.

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  • 1Department of Chemistry, Lancaster University, Lancaster LA1 4YB, U.K.

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gmx_ffconv is a new tool that simplifies converting between GROMACS all-atom force fields. It automates force field conversion by reordering coordinate files, saving time and reducing errors in molecular simulations.

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Area of Science:

  • Computational chemistry
  • Molecular dynamics simulations
  • Biophysics

Background:

  • Converting between different all-atom force fields in GROMACS is complex due to variations in naming conventions and atom ordering.
  • Manual conversion is time-consuming and prone to errors, hindering comparative simulations.

Purpose of the Study:

  • To present gmx_ffconv, a command-line tool designed to automate and simplify the conversion of molecular systems between all-atom force fields within GROMACS.
  • To enable seamless use of identical starting coordinates across different force fields for comparative simulations.

Main Methods:

  • The gmx_ffconv tool utilizes molecular graph matching to reorder coordinate files.
  • It resolves atom ordering and naming mismatches between disparate force fields.

Main Results:

  • gmx_ffconv successfully facilitates force field conversion for a wide array of systems.
  • Validation included small ligands, large solvated heterogeneous systems (over 2 million atoms), and nonstandard molecules.

Conclusions:

  • gmx_ffconv significantly streamlines the process of force field conversion in GROMACS.
  • The tool enhances the efficiency and reliability of comparative molecular simulations by eliminating manual intervention.