A grid-based backbone correction to the ff12SB protein force field for implicit-solvent simulations

摘要

Force fields, such as Amber’s ff12SB, can be fairly accurate models of the physical forces in proteins and other biomolecules. When coupled with accurate solvation models, force fields are able to bring insight into the conformational preferences, transitions, pathways and free energies for these biomolecules. When computational speed/cost matters implicit solvent is often used -- at the cost of accuracy. We present an empirical grid-like correction term –in the spirit of cMAPs-- to the combination of the ff12SB protein force field and the GBneck2 implicit solvent model. Ff12SB-cMAP is parameterized on experimental helicity data. We provide validation on a set of peptides and proteins. Ff12SB-cMAP successfully improves the secondary structure biases observed in ff12SB+Gbneck2. Ff12SB-cMAP can be downloaded () and used within the Amber package. It can improve the agreement of force fields + implicit solvent with experiments.