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• W1987372093 abstract "Previous 4-21G ab initio geometry optimizations of various conformations of the model dipeptides (N-acetyl N'methyl amides) of glycine (GLY) and the alanine (ALA) have been used to help refine the empirical force constants and equilibrium geometry in the CHARMM force field for peptides. Conformationally dependent geometry trends from ab initio calculations and positions of energy minima on the ab initio energy surfaces have been used as guides in the parameter refinement, leading to modifications in the bond stretch, angle bending, and some torsional parameters. Preliminary results obtained with these refined empirical parameters are presented for the protein Crambin. Results for the cyclic (Ala-Pro-DPhe)2 are compared with those from other calculations. It seems that the dihedral angle fit achieved by the new parameters is significantly improved compared with results from force fields whose derivation does not include ab initio geometry trends." @default.
• W1987372093 created "2016-06-24" @default.
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• W1987372093 date "1990-06-01" @default.
• W1987372093 modified "2023-10-10" @default.
• W1987372093 title "On the use of conformationally dependent geometry trends from<i>ab initio</i>dipeptide studies to refine potentials for the empirical force field CHARMM" @default.
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• W1987372093 doi "https://doi.org/10.1002/jcc.540110514" @default.
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