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Bioorg Med Chem Lett. 2009 Jun 15;19(12):3177-82. doi: 10.1016/j.bmcl.2009.04.118. Epub 2009 May 3.

Differences in CYP3A4 catalyzed bioactivation of 5-aminooxindole and 5-aminobenzsultam scaffolds in proline-rich tyrosine kinase 2 (PYK2) inhibitors: retrospective analysis by CYP3A4 molecular docking, quantum chemical calculations and glutathione adduct detection using linear ion trap/orbitrap mass spectrometry.

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  • 1Pfizer Global Research and Development, Eastern Point Road, Groton, CT 06340, USA.

Abstract

Previous studies have demonstrated the CYP3A4 mediated oxidation of the 5-aminooxindole motif, present in the trifluoromethylpyrimidine class of PYK-2 inhibitors, to a reactive bis-imine species, which can be trapped with glutathione (GSH) in human liver microsomal incubations. The corresponding 5-aminobenzsultam derivatives, which should possess a similar oxidative liability, do not form GSH conjugates in microsomal incubations. In the current study, we conducted a retrospective analysis on representative 5-aminooxindole and 5-aminobenzsultam PYK-2 inhibitors utilizing CYP3A4 molecular docking and quantum chemical calculations to rationalize the bioactivation differences. Our analysis revealed key differences in (a) active site binding and (b) two-electron oxidation rates, which correlate with GSH adduct formation with the two moieties. The value of linear ion/orbitrap mass spectrometry to detect GSH conjugates with greater sensitivity, compared with conventional triple quadrupole mass spectrometry approaches, was also demonstrated in the course of these studies.

PMID:
19433356
DOI:
10.1016/j.bmcl.2009.04.118
[PubMed - indexed for MEDLINE]
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