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The MM3 force field for amides, polypeptides and proteins
Author(s) -
Lii JennHuei,
Allinger Norman L.
Publication year - 1991
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.540120208
Subject(s) - bond length , chemistry , force field (fiction) , hydrogen bond , molecular geometry , dipole , crystallography , root mean square , lattice energy , atomic charge , crystal structure , computational chemistry , peptide bond , electrostatics , molecule , peptide , physics , quantum mechanics , organic chemistry , biochemistry
The potential functions for simple amides, several peptides and a small protein have been worked out for the MM3 force field. Structures and energies were fit as previously with MM2, but additionally, we fit the vibrational spectra of the simple amides (average rms error over four compounds, 34 cm −1 ), and examined more carefully electrostatic interactions, including charge‐charge and charge‐dipole interactions. The parameters were obtained and tested by examining four simple amides, five electrostatic model complexes, two dipeptides, six crystalline cyclic peptides, and the protein Crambin. The average root‐mean‐square deviation from the X‐ray structures for the six cyclic peptide crystals was only 0.10 Å for the nonhydrogen atomic positions, and 0.011 Å, 1.0°, and 4.9° for bond lengths, bond angles, and torsional angles, respectively. The parameter set was then further tested by minimizing the high resolution crystal structure of the hydrophobic protein Crambin. The resultant root‐mean‐square deviations for the non‐hydrogen atomic data, in the presence of the crystal lattice, are 0.22 Å, 0.023 Å, 2.0°, and 6.4° for coordinates, bond lengths, bond angles, and torsional angles, respectively.