ACPYPE

ACPYPE generates molecular dynamics topology and parameter files for small molecules to enable atomistic simulations with force fields used for proteins and nucleic acids, including AMBER (GAFF2), GROMACS, CHARMM, and CNS.

Key Features:

• Versatile Input Options: Accepts SMILES strings, PDB files, and mol2 coordinate files as inputs for small molecules.
• Advanced Force Field Support: Integrates OpenBabel and ANTECHAMBER to generate parameters for AMBER (including GAFF2) and to facilitate conversion to the GLYCAM force field.
• Comprehensive Output Formats: Produces topology and parameter files compatible with GROMACS, AMBER, CHARMM, and CNS.
• API Integration: Exposes a programmatic API for automated topology and parameter generation in workflows.

Scientific Applications:

• Small-molecule preparation for MD simulations: Generates topology and parameter files required to include small molecules in atomistic molecular dynamics simulations.
• Drug discovery and lead optimization: Provides parameterization of drug-like molecules to support binding, stability, and conformational studies in drug discovery workflows.
• Protein–ligand interaction studies: Enables generation of ligand parameters for simulation-based analysis of protein–ligand interactions.
• Simulations of proteins and nucleic acids: Produces small-molecule topologies compatible with simulations of proteins and nucleic acids using multiple force fields.

Methodology:

Uses OpenBabel for format conversion and molecular structure manipulation and ANTECHAMBER to generate AMBER-compatible parameter files (including GAFF2), with capability to convert parameters to GLYCAM.