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The key role of atom types, reference states, and interaction cutoff radii in the knowledge‐based method: New variational approach
Author(s) -
Ruvinsky A. M.,
Kozintsev A. V.
Publication year - 2005
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.20385
Subject(s) - cutoff , atom (system on chip) , root mean square , type (biology) , chemistry , atomic physics , physics , molecular physics , mathematics , computer science , quantum mechanics , ecology , biology , embedded system
We present a variational method to derive knowledge‐based potentials. The method is based on an optimization procedure of objective variables: atom types, reference states, and interaction cutoff radii. We suggest and apply new unsymmetrical reference states. The cutoff radii and atom types are optimized to improve docking accuracy of the corresponding potentials. The atom types are varied along an atom type tree, with 6 root and 49 top atom types, and the set of 18 optimal atom types is obtained. We demonstrate strong dependence between the choice of atom types and the docking accuracy of the potentials derived with these atom types. The averaged root‐mean square deviations (RMSDs) of the ligand docked positions relative to the experimentally determined positions decrease when the elements C, N, O are split into the optimal types. Proteins 2005. © 2005 Wiley‐Liss, Inc.