Discovery of a Novel Linoleate Dioxygenase of Fusarium oxysporum and Linoleate Diol Synthase of Colletotrichum graminicola
作者:Linda Sooman、Ernst H. Oliw
DOI:10.1007/s11745-015-4078-9
日期:2015.12
(cyclooxygenase) superfamily. The objective was to characterize the enzymatic activities of the DOX-CYP homologue of Colletotrichum graminicola (EFQ34869) and the DOX homologue of F. oxysporum (EGU79548). The former oxidized oleic and linoleic acids in analogy with 7,8-linoleate diol synthases (LDSs), but with the additional biosynthesis of 8,11-dihydroxylinoleic acid. The latter metabolized fatty acids
真菌病原体对许多生命形式构成严重威胁。致病性真菌镰刀菌和炭疽菌及其特有的形态(f。spp。)感染许多类型的农作物,造成严重后果,而尖孢镰刀菌也可诱发人的角膜炎和过敏性疾病。这些真菌编码动物血红素过氧化物酶(环加氧酶)超家族的双加氧酶-细胞色素P450(DOX-CYP)融合蛋白的同源物。目的是表征格拉米炭疽菌的DOX-CYP同系物(EFQ34869)和尖孢镰刀菌的DOX同系物(EGU79548)的酶活性。前者氧化油酸和亚油酸类似于7,8-亚油酸二醇合酶(LDSs),但另外还合成了8,11-二羟基亚油酸。后者将脂肪酸代谢为具有广泛底物特异性的氢过氧化物。它以相同的方式将20:4n-6和18:2n-6氧化为在(n-10)位具有R构型的氢过氧化物和其他n-6脂肪酸。[11S-2H] 18:2n-6被保留而被氧化,[11R-2H] 18:2n-6被失去氘而被氧化,表明表面上有氢的吸收和氧的插入。n-