title: Subterminal hydroxylation of fatty acids by a cytochrome P-450-dependent enzyme system from a fungus, Fusarium oxysporum.
abstract: The cell-free extract of a cytochrome P-450-producing fungus, Fusarium oxysporum, was found to catalyze the hydroxylation of fatty acids. Three product isomers were formed from a single fatty acid. The products from lauric acid were identified by mass-spectrometry as 9-, 10-, and 11-hydroxydodecanoic acids, and those from palmitic acid as 13-, 14-, and 15-hydroxyhexadecanoic acids. The ratio of the isomers formed was 50 : 36 : 14 in the case of laurate hydroxylation, and 37 : 47 : 16 in the case of palmitate. The reaction was dependent on both NADPH (or NADH) and molecular oxygen,and was strongly inhibited by carbon monoxide, menadione, or the antibody to purified Fusarium P-450. Further, lauric acid induced a type I spectral change in purified Fusarium P-450. Further, lauric acid induced a type I spectral change in purified Fusarium P-450 with an apparent Kd of 0.3 mM. The hydroxylase activity together with cytochrome P-450 could be detected in both the soluble and microsome fractions, and the activity was almost proportional to the amount of cytochrome P-450 reducible with NADPH. It can be concluded from these results that Fusarium P-450 reducible with NADPH. It can be concluded from these results that Fusarium P-450 is involved in the (omega-1)-, (omega-2)-, and (omega-3)-hydroxylation of fatty acids catalyzed by the cell-free extract of the fungus.
mesh_terms: D000906:Antibodies; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism*; D005670:Fusarium / Q000201:enzymology* / Q000276:immunology; D006900:Hydroxylation; D007850:Lauric Acids / Q000378:metabolism; D013058:Mass Spectrometry; D008861:Microsomes / Q000201:enzymology; D006899:Mixed Function Oxygenases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D009249:NADP / Q000378:metabolism; D010084:Oxidation-Reduction
chemical_list: D000906:Antibodies; D005227:Fatty Acids; D007850:Lauric Acids; C030358:lauric acid; D009249:NADP; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases