The degradative pathway of 5-alkanolides (alkano-δ-lactones) and 2-deceno-δ-lactone (massoialactone) by Fusarium solani PM-1, a massoialactone-producing fungus, was investigated. (±)-Alkano-δ-lactones were shown to be degraded first to a one-carbon-atom-less methyl ketone, 4-hydroxy-2-alkanones, after hydroxylation. The 4-hydroxy-2-alkanones were then converted to 2,4-alkanediones or to 2,4-alkanediols, and are suggested to be successively degraded by modified β-oxidation. (R)-Massoialactone, the main compound in the volatiles produced by the strain, was first saturated to (R)-decano-δ-lactone, and then this saturated lactone was degraded in the same way. These observations lead to a conceptional cycle of acetate moieties throughout the production and degradation of the secondary metabolites.
研究了产生大豆内酯的真菌 Fusarium solani PM-1 降解 5-烷醇内酯(烷-δ-内酯)和 2-
癸烯-δ-内酯(大豆内酯)的途径。研究表明,(±)-烷-δ-内酯经羟基化后首先降解为无一碳原子的甲基酮,即
4-羟基-2-烷酮。然后,
4-羟基-2-烷酮被转化为 2,4-烷二酮或 2,4-烷二醇,并被认为通过改良的 β-氧化作用连续降解。(R)-马索内酯是该菌株产生的挥发性物质中的主要化合物,首先被饱和成(R)-癸内酯,然后这种饱和内酯以同样的方式被降解。这些观察结果表明,在次生代谢物的整个生产和降解过程中,
醋酸酯分子在概念上是一个循环。