Effect of structural variation on aldehyde oxidase-catalyzed oxidation of zoniporide

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Deepak DalviePing Kang

Abstract

Current studies explored the effect of structural changes on the aldehyde oxidase (AO)-mediated metabolism of zoniporide (1). Zoniporide analogs with modifications of the acylguanidine moiety, the cyclopropyl group on the pyrazole ring, and the quinoline ring were studied for their AO-catalyzed metabolism using the human S9 fraction. Analysis of the half-lives suggested that subtle changes in the structure of 1 influenced its metabolism and that the guanidine and the quinoline moieties were prerequisites for AO-catalyzed oxidation to 2-oxozoniporide (M1). In contrast, replacement of the cyclopropyl group with other alkyl groups was tolerated. The effect of structural variation on AO properties was rationalized by docking 1 and its analogs into the human AO homology model. These studies indicated the importance of electrostatic, π-π stacking and hydrophobic interactions of the three motifs with residues in the active site. Differences in substrate properties were also rationalized by comparing their half-lives with cLogD, electrophilicity parameters [electrostatic potential (ESP) charges and energy of lowest unoccupied molecular orbitals (E(LUMO))], and the energies of formation of tetrahedral intermediates (J Med Chem 50:4642-4...Continue Reading

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