Recebido em 7/8/02; aceito em 28/10/02 A NEW MODEL FOR THE H 2 ANTAGONISTS BINDING SITE BASED ON 3D QSAR ANALYSIS. A new model for the H 2 antagonists binding site is postulated based on adsorption coefficient values of sixteen antagonists, in the affinities constants of the primary and secondary binding sites, and in the chemical characterization of these sites by 3D-QSAR. All study compounds are in the extended conformation and deprotonated form. The lateral validation of the QSARs, CoMFA analysis, affinity constants and chemical similarity data suggest that the antagonists block the proton pump in the H 2 receptor interacting with two tyrosines-one in the helix 5, and other in the helix 6.
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