期刊
SOFTWAREX
卷 10, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.softx.2019.100241
关键词
ACPYPE; Glycam06; Force field; Nonbonded scaling factor; Carbohydrate; Gromacs
资金
- Defense Threat Reduction Agency, USA (DTRA) [HDTRA1-15-1-0054]
Herein we report an update to ACPYPE, a Python3 tool that now properly converts AMBER to GROMACS topologies for force fields that utilize nondefault and nonuniform 1-4 electrostatic and nonbonded scaling factors or negative dihedral force constants. Prior to this work, ACPYPE only converted AMBER topologies that used uniform, default 1-4 scaling factors and positive dihedral force constants. We demonstrate that the updated ACPYPE accurately transfers the GLYCAM06 force field from AMBER to GROMACS topology files, which employs non-uniform 1-4 scaling factors as well as negative dihedral force constants. Validation was performed using beta-D-G1cNAc through gas-phase analysis of dihedral energy curves and probability density functions. The updated ACPYPE retains all of its original functionality, but now allows the simulation of complex glycomolecular systems in GROMACS using AMBER-originated force fields. ACPYPE is available for download at https://github.com/alanwilter/acpype. (C) 2019 Published by Elsevier B.V.
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