Reconstitution of a Type II Polyketide Synthase that Catalyzes Polyene Formation,Angewandte Chemie International Edition

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Reconstitution of a Type II Polyketide Synthase that Catalyzes Polyene Formation
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-01-17 , DOI: 10.1002/anie.201709636
Danyao Du ₁ , Yohei Katsuyama ₁ , Kazuo Shin-ya ₂ , Yasuo Ohnishi ₁

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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 of a β‐hydroxy group, respectively, to form a trans double bond. Incubation of the acyl carrier protein (Iga10), the ketosynthase/chain length factor complex (Iga11–Iga12), Iga13 and Iga16 with malonyl and hexanoyl‐CoAs and NADPH followed by KOH hydrolysis resulted in the formation of four unsaturated carboxylic acids (C₈, C₁₀, C₁₂, and C₁₄), indicating that IgaPKS catalyzes tetraene formation by repeating the cycle of condensation, keto‐reduction and dehydration with strict stereo‐specificity. We propose “highly reducing type II PKS subfamily” for the polyene‐producing type II PKSs.

中文翻译：

重构可催化多烯形成的II型聚酮化合物合酶

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”。

更新日期：2018-01-17

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