Journal
CHEMICAL PHYSICS LETTERS
Volume 401, Issue 1-3, Pages 312-317Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2004.11.070
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AMBER-based hybrid force field was developed, with mixing the mainchain torsion energies of AMBER parm94 and parm96 force fields, with introducing a weighting factor to control the mixing ratio. First, dependence of an adiabatic Phi-Psi potential-energy map of alanine dipeptide on the weighting factor was investigated, and the map was compared with an ab initio Phi-Psi map. Second, we did enhanced conformational sampling of two six-residue peptides known to form a helical or turn conformation in solution. The hybrid force field reproduced the ab initio energy better than either parm94 or parm96, and exhibited the secondary-structure preference depending on the amino acid sequence. (C) 2004 Elsevier B.V. All rights reserved.
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