The enzyme contains heme. The bifunctional enzyme from?Gaeumannomyces graminis?catalyses the oxidation of linoleic acid to (8R,9Z,12Z)-8-hydroperoxyoctadeca-9,12-dienoate (cf. EC?1.13.11.60, linoleate 8R-lipoxygenase), which is then isomerized to (7S,8S,9Z,12Z)-5,8-dihydroxyoctadeca-9,12-dienoate [3].