BIOSYNTHESIS OF 8R-HYDROPEROXYLINOLEIC ACID BY THE FUNGUS LAETISARIA-ARVALIS

8-Hydroxylinoleic acid is known to be a fungicidal metabolite formed b y the fungus Laetisaria arvalis (Bowers, W.S. et al. (1986) Science 23 2, 105-106). In the present report, the mechanism of formation of 8-hy droxylinoleic acid was investigated. L. arvalis metabolized [C-14]lino leic 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 chromatogr aphy-mass spectrometry. The absolute configuration of the hydroxyl was determined to be R by ozonolysis of the (-)-menthoxycarbonyl derivati ve of 8-hydroxylinoleic acid. Linoleic acid 8 R-dioxygenase activity w as present in the 100 000 X g supernatant of the cell lysate. In summa ry, the 8R-linoleic acid dioxygenase of L. arvalis shows many similari ties with the 8R-dioxygenase recently described in the fungus Gaeumann omyces graminis.