ω-Hydroxylation of Z9-octadecenoic, Z9,10-epoxystearic and 9,10-DIHYDROXYSTEARIC ACID (cas 120-87-6)s by microsomal cytochrome P450 systems from Vicia sativa

Add time:08/30/2019    Source:sciencedirect.com

A microsomal fraction from etiolated Vicia sativa seedlings incubated aerobically with [1-14C]oleic acid (Z9-octadecenoic acid) or [1-14C]9,10-epoxystearic acid or [1-14C]9,10-dihydroxystearic acid catalyzed the NADPH-dependent formation of hydroxylated metabolites. The chemical structure of compounds formed from oleic, 9,10-epoxystearic or 9,10-dihydroxystearic acids was established by gas chromatography/mass spectra analysis to be 18-hydroxyoleic acid, 18-hydroxy-9,10-epoxystearic acid and 9,10,18-trihydroxystearic acid, respectively. The reactions required O2 and NADPH and were inhibited by carbon monoxide. As expected for monooxygenase reactions involving cytochrome P450, inhibition could be partially reversed by light and all three reactions were inhibited by antibodies raised against NADPH-cytochrome P450 reductase from Jerusalem artichoke. The ω-hydroxylation of the three substrates was enhanced in microsomes from clofibrate induced seedlings.

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