title: Comparison of knowledge-based and distance geometry approaches for generation of molecular conformations.
abstract: A knowledge-based approach for generating conformations of molecules has been developed. The method described here provides a good sampling of the molecule's conformational space by restricting the generated conformations to those consistent with the reference database. The present approach, internally named et for enumerate torsions, differs from previous database-mining approaches by employing a library of much larger substructures while treating open chains, rings, and combinations of chains and rings in the same manner. In addition to knowledge in the form of observed torsion angles, some knowledge from the medicinal chemist is captured in the form of which substructures are identified. The knowledge-based approach is compared to Blaney et al.'s distance geometry (DG) algorithm for sampling the conformational space of molecules. The structures of 113 protein-bound molecules, determined by X-ray crystallography, were used to compare the methods. The present knowledge-based approach (i) generates conformations closer to the experimentally determined conformation, (ii) generates them sooner, and (iii) is significantly faster than the DG method.
authors: Molecular Systems Department, Merck Research Laboratories, P.O. Box 4, West Point, Pennsylvania 19486, USA. bradley_feuston@merck.com
authors: B P
authors: BP
authors: Feuston
authors: M D
authors: MD
authors: Miller
authors: J C
authors: JC
authors: Culberson
authors: R B
authors: RB
authors: Nachbar
authors: S K
authors: SK
authors: Kearsley
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D018360:Crystallography, X-Ray; D008968:Molecular Conformation; D010363:Pattern Recognition, Automated; D021281:Quantitative Structure-Activity Relationship