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Use of Density Functional Calculations To Predict the Regioselectivity of Drugs and Molecules Metabolized by Aldehyde Oxidase

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Department of Molecular Systems, Merck Research Laboratories, Rahway, New Jersey 07065, Department of Drug Metabolism, Merck Research Laboratories, West Point, Pennsylvania 19468, and Department of Chemistry, Washington State University, Pullman, Washington 99164
Cite this: J. Med. Chem. 2007, 50, 19, 4642–4647
Publication Date (Web):August 25, 2007
https://doi.org/10.1021/jm0703690
Copyright © 2007 American Chemical Society

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    Abstract

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    Aldehyde oxidase is a molybdenum hydroxylase that catalyzes the oxidation of aldehydes and nitrogen-containing heterocycles. The enzyme plays a dual role in the metabolism of physiologically important endogenous compounds and the biotransformation of xenobiotics. Using density functional theory methods, geometry optimization of tetrahedral intermediates of drugs and druglike compounds was examined to predict the likely metabolites of aldehyde oxidase. The calculations suggest that the lowest energy tetrahedral intermediate resulting from the initial substrate corresponds to the observed metabolite ≥90% of the time. Additional calculations were performed on a series of heterocyclic compounds where the products resulting from metabolism by xanthine oxidase and aldehyde oxidase differ in many instances. Again, the lowest energy tetrahedral intermediate corresponded to the observed product of aldehyde oxidase metabolism ≥90% for the compounds examined, while the observed products of xanthine oxidase were not well predicted.

    *

     To whom correspondence should be addressed. For R.A.T.:  phone, 509-335-1516; e-mail, [email protected]. For K.R.K.:  e-mail, [email protected]. For J.P.J.:  phone, 509-335-5983; e-mail, [email protected].

     Department of Molecular Systems, Merck Research Laboratories.

     Washington State University.

    §

     Department of Drug Metabolism, Merck Research Laboratories.

    Abbreviations:  AO, aldehyde oxidase; XO, xanthine oxidase; MoCo, molybdenum pyranopterin cofactor; ALS, amyotrophic lateral sclerosis; DFT, density functional theory.

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