title: Inhibition of soybean lipoxygenase by SKF 525-A and metyrapone.
abstract: To determine whether agents which inhibit cytochrome P-450 enzymes also inhibit lipoxygenase, the effects of metyrapone and SKF 525-A were assessed on soybean lipoxygenase using a spectrophotometric technique which allows for measurement of both the rate and magnitude of product formation. Both SKF 525-A and metyrapone inhibited the rate of product formation and the final amount of product formed in 5 min incubations SKF 525-A was 5 to 5 times more potent than metyrapone, with the IC50 for SKF 525-A 40 microM and for metyrapone between 150 and 200 microM as determined by the total product formation in 5 minutes. Analysis of the reduced product by HPLC confirmed that the substances monitored were those generated by the 15-lipoxygenase enzyme.
mesh_terms: D002851:Chromatography, High Pressure Liquid; D007700:Kinetics; D016859:Lipoxygenase Inhibitors; D008797:Metyrapone / Q000494:pharmacology*; D010944:Plants / Q000201:enzymology*; D011335:Proadifen / Q000494:pharmacology*; D013025:Glycine max / Q000201:enzymology
chemical_list: D016859:Lipoxygenase Inhibitors; D011335:Proadifen; D008797:Metyrapone