Biosynthesis of Jasmonates from Linoleic Acid by the Fungus
<i>Fusarium oxysporum</i>
. Evidence for a Novel Allene Oxide Cyclase
作者:Ernst H. Oliw、Mats Hamberg
DOI:10.1002/lipd.12180
日期:2019.9
13(S)‐12‐oxophytoenoic acid, the 15,16‐dihydro analog of 12‐OPDA, was formed upon incubation of unlabeled or d5‐18:2n‐6. Appearance of the α‐ketol, 12‐oxo‐13‐hydroxy‐9‐octadecenoic acid following incubation of unlabeled or [13C18]‐labeled 13(S)‐hydroperoxy‐9(Z),11(E)‐octadecadienoic acid confirmed the involvement of AOS and the biosynthesis of the allene oxide 12,13(S)‐epoxy‐9,11‐octadecadienoic acid. The lack
尖孢镰刀菌f。sp 。郁金香(FOT)会向生长培养基分泌(+)-7-异茉莉单酰基-(S)-异亮氨酸((+)-JA-Ile)以及约10倍的9,10-二氢-(+)-7 -异-ja-ILE。植物和真菌从18:3n-3通过12-氧代苯二酸(12-OPDA )形成(+)-JA-Ile ,其依次由13 S-脂氧合酶,氧化烯合酶(AOS)和氧化烯环化酶( AOC)。植物AOC不接受亚油酸(18:2n-6)衍生的烯丙基氧化物,二氢茉莉酮酸酯在植物中不常见。这就提出了一个问题:18:2n-6是否在镰刀菌中用作9,10-dihydro-JA-Ile的前体,或者后者是否由在(+)-JA-Ile或其前体之一的n-3双键上起作用的假定还原酶活性引起。pentadeuterated(d孵育5)18:3N-3导致d的形成菌丝体5 - (+) - JA-ILE而d 5 -9,10-二氢JA-ILE是不可检测的。相反,在[17