Biosynthesis of 8R-hydroperoxylinoleic acid by the fungus Laetisaria arvalis.
8-Hydroxylinoleic acid is known to be a fungicidal metabolite formed by the fungus Laetisaria arvalis (Bowers, W.S. et al. (1986) Science 232, 105-106). In the present report, the mechanism of formation of 8-hydroxylinoleic acid was investigated. L. arvalis metabolized [14C]linoleic acid to 8-hydroperoxylinoleic acid and 8-hydroxylinoleic acid as major metabolites. The identification is based on the reduction of the hydroperoxide to an alcohol with stannous chloride and gas chromatography-mass spectrometry. The absolute configuration of the hydroxyl was determined to be R by ozonolysis of the (-)-menthoxycarbonyl derivative of 8-hydroxylinoleic acid. Linoleic acid 8R-dioxygenase activity was present in the 100,000 x g supernatant of the cell lysate. In summary, the 8R-linoleic acid dioxygenase of L. arvalis shows many similarities with the 8R-dioxygenase recently described in the fungus Gaeumannomyces graminis.
Department of Pharmaceutical Biosciences, Uppsala University Biomedical Center, Sweden.
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Brodowsky
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Oliw
D001487:Basidiomycota / Q000378:metabolism*; D002855:Chromatography, Thin Layer; D008401:Gas Chromatography-Mass Spectrometry; D019746:Intramolecular Oxidoreductases; D007535:Isomerases / Q000378:metabolism; D008041:Linoleic Acids / Q000096:biosynthesis* / Q000737:chemistry; D008968:Molecular Conformation
D008041:Linoleic Acids; C075807:8-hydroperoxylinoleic acid; D007535:Isomerases; D019746:Intramolecular Oxidoreductases; C021377:hydroperoxide isomerase