作者:Danyao Du、Yohei Katsuyama、Kazuo Shin-ya、Yasuo Ohnishi
DOI:10.1002/anie.201709636
日期:2018.2.12
While type II polyketide synthases (PKSs) are known for producing aromatic compounds, a phylogenetically new subfamily of type II PKSs have been recently proposed to synthesize polyene structures. Here we report in vitro analysis of such a type II PKS, IgaPKS for ishigamide biosynthesis. The ketoreductase (Iga13) and dehydratase (Iga16) were shown to catalyze the reduction of a β‐keto group and dehydration
虽然已知II型聚酮化合物合酶(PKS)可产生芳族化合物,但最近有人提出了系统发育上II型PKS的新亚家族来合成多烯结构。在这里,我们报告了这种II型PKS,IgaPKS用于ishigamide生物合成的体外分析。研究表明,酮还原酶(Iga13)和脱水酶(Iga16)分别催化β-酮基的还原和β-羟基的脱水,形成反式双键。酰基载体蛋白(Iga10),酮合成酶/链长因子复合物(Iga11–Iga12),Iga13和Iga16与丙二酸和己酰辅酶A和NADPH的孵育,然后KOH水解导致形成四种不饱和羧酸(C 8,C 10,C 12,和C 14),表明IgaPKS通过严格的立体特异性重复缩合,酮还原和脱水循环来催化四烯形成。对于产多烯的II型PKS,我们建议“高度还原II型PKS亚家族”。