title: 2D-QSAR and 3D-QSAR/CoMFA analyses of the N-terminal substituted anthranilic acid based CCK(1) receptor antagonists: 'Hic Rhodus, hic saltus'.
abstract: A research is presented on quantitative structure-activity relationship (QSAR) studies on the more recent class of non-peptidic CCK(1) receptor antagonists. Our results suggest that the balance of hydrophobicity and volume dependent polarizability term plays a key role in the antagonism of CCK(1) receptor. The size of the substitution of ligands at particular position which induce steric fit is crucial as well as their hydrophobic contribution. Indicator variables were used after the best model was found to account for the usual structural features. The CoMFA results show a good variance explanation and the best self-predictivity is slightly lower than 60% with both leave-one-out and random-group methods. The CoMFA molecular fields showed the importance of steric hindrance of the substituent. From the GRIND models it can be deduced that the shape differences of the molecules are secondary in the regulation of the activity, or better, that their polar substituents are capable of occupying the same zones of the space in the most of the cases.
authors.affiliation: Department of Pharmaceutical Chemistry, School of Pharmacy, Aristotelian University of Thessaloniki, Thessaloniki 54124, Greece. hadjipav@pharm.auth.gr
authors.forename: Dimitra
authors.initials: D
authors.lastname: Hadjipavlou-Litina
authors.forename: Paolo
authors.initials: P
authors.lastname: Braiuca
authors.forename: Lucia
authors.initials: L
authors.lastname: Lassiani
authors.forename: Michela V
authors.initials: MV
authors.lastname: Pavan
authors.forename: Antonio
authors.initials: A
authors.lastname: Varnavas
mesh_terms: D000818:Animals; D003198:Computer Simulation; D057927:Hydrophobic and Hydrophilic Interactions; D008958:Models, Molecular; D015394:Molecular Structure; D011485:Protein Binding; D021281:Quantitative Structure-Activity Relationship; D051381:Rats; D043886:Receptor, Cholecystokinin A / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D062367:ortho-Aminobenzoates / Q000737:chemistry* / Q000378:metabolism
chemical_list: D043886:Receptor, Cholecystokinin A; D062367:ortho-Aminobenzoates; C031385:anthranilic acid