ff-ptm force field is a set of self-consistent AMBER forcefield parameters for frequently occurring post-translational modifications (PTMs).Partial charges reproduce an ab initio electrostatic potential surface and key torsions were re-fit to reproduce the ab initio rotational profile..

Parameters obtained by QM and AMBER ff03.

Source: http://selene.princeton.edu/FFPTM/multi.html


Related publications:

i) Khoury, G.A., Thompson, J.P., Smadbeck, J., Kieslich, C.A., and Floudas, C. A. Forcefield_PTM: Ab Initio Charge and AMBER Forcefield Parameters for Frequently Occurring Post-Translational Modifications. Journal of Chemical Theory and Computation 2013, 9 (12) 5653-5674. DOI: 10.1021/ct400556v
