Early Oxidative Transformations During the Biosynthesis of Terrein and Related Natural Products
作者:Lukas Kahlert、Darlon Bernardi、Maurice Hauser、Laura P. Ióca、Roberto G. S. Berlinck、Elizabeth J. Skellam、Russell J. Cox
DOI:10.1002/chem.202101447
日期:2021.8.16
derived from the C10-precursor 6-hydroxymellein (6-HM) via an oxidative ring contraction. Although the corresponding biosynthetic gene cluster (BGC) has been identified, details of the enzymatic oxidative transformations are lacking. Combining heterologous expression and in vitro studies we show that the flavin-dependent monooxygenase (FMO) TerC catalyzes the initial oxidative decarboxylation of 6-HM
土曲霉毒素通过氧化环收缩从 C 10 -前体 6-羟基蜜蜡 (6-HM)衍生而来。尽管已经确定了相应的生物合成基因簇 (BGC),但缺乏酶促氧化转化的细节。结合异源表达和体外研究,我们表明黄素依赖性单加氧酶 (FMO) TerC 催化 6-HM 的初始氧化脱羧。反应性中间体被第二个 FMO TerD 进一步羟基化以产生高度氧化的芳香族物质,但该途径的进一步重构受到阻碍。在海洋衍生的Roussoella sp 中鉴定出相关的 BGC. DLM33 并通过异源表达确认。这些研究表明,在保守 FMO 催化的内酯前体氧化脱羧后,terrein 和相关(多氯化)同源物的生物合成途径发生分歧,并进一步表明侧链的早期脱水是必不可少的步骤。