Studies on the Biosynthesis of the Fungal Metabolite Oudenone. 2. Synthesis and Enzymatic Cyclization of an α-Diketone, Open-Chain Precursor into Oudenone in Cultures of <i>Oudemansiella </i><i>r</i><i>adicata</i>
作者:Youla S. Tsantrizos、Xianshu Yang、Andrew McClory
DOI:10.1021/jo9901135
日期:1999.9.1
biosynthetic scheme for the formation of the hexaketide 4 and its enzymatic cyclization into oudenone (1), consistent with the experimental data, is described. The proposed mechanism for the cyclization of 4 to 1 is analogous to the "polyepoxide cascade" model, which has been previously implicated in the biosynthesis of polyether antibiotics.
事实表明,α-二酮4是真菌代谢产物oudenone(1a和1b)的开链生物合成前体。将4的(2)H标记的N-乙酰半胱胺硫酯衍生物与放射线虫的生长培养物一起孵育后,将4完整掺入到1中。与实验数据相一致,描述了六酮化合物4的形成及其酶环化为oudenone(1)的生物合成方案。所提出的4比1环化的机理类似于“聚环氧化物级联”模型,该模型先前与聚醚抗生素的生物合成有关。