title: Application of electron conformational-genetic algorithm approach to 1,4-dihydropyridines as calcium channel antagonists: pharmacophore identification and bioactivity prediction.
abstract: Two different approaches, namely the electron conformational and genetic algorithm methods (EC-GA), were combined to identify a pharmacophore group and to predict the antagonist activity of 1,4-dihydropyridines (known calcium channel antagonists) from molecular structure descriptors. To identify the pharmacophore, electron conformational matrices of congruity (ECMC)-which include atomic charges as diagonal elements and bond orders and interatomic distances as off-diagonal elements-were arranged for all compounds. The ECMC of the compound with the highest activity was chosen as a template and compared with the ECMCs of other compounds within given tolerances to reveal the electron conformational submatrix of activity (ECSA) that refers to the pharmacophore. The genetic algorithm was employed to search for the best subset of parameter combinations that contributes the most to activity. Applying the model with the optimum 10 parameters to training (50 compounds) and test (22 compounds) sets gave satisfactory results (R(2)(training)= 0.848, R(2)(test))= 0.904, with a cross-validated q(2) = 0.780).
authors: Department of Chemistry, Science and Art Faculty, Siirt Universty, Siirt, Turkey.
authors: Nazmiye
authors: N
authors: Geçen
authors: Emin
authors: E
authors: Sarıpınar
authors: Ersin
authors: E
authors: Yanmaz
authors: Kader
authors: K
authors: Sahin
mesh_terms: D000465:Algorithms; D002121:Calcium Channel Blockers / Q000737:chemistry*; D015220:Calcium Channels; D004095:Dihydropyridines / Q000737:chemistry* / Q000494:pharmacology; D015195:Drug Design; D004583:Electrons; D008956:Models, Chemical; D008962:Models, Theoretical; D008968:Molecular Conformation; D021281:Quantitative Structure-Activity Relationship; D011955:Receptors, Drug / Q000737:chemistry*
chemical_list: D002121:Calcium Channel Blockers; D015220:Calcium Channels; D004095:Dihydropyridines; D011955:Receptors, Drug; C038806:1,4-dihydropyridine