Unveiling fungal detoxification pathways of the cruciferous phytoalexin rapalexin A: Sequential L-cysteine conjugation, acetylation and oxidative cyclization mediated by Colletotrichum spp.
作者:M. Soledade C. Pedras、Chintamani Thapa
DOI:10.1016/j.phytochem.2019.112188
日期:2020.1
higginsianum and C. dematium transformed rapalexin A to two previously undescribed metabolites, the structures of which were confirmed by chemical synthesis: N-acetyl-S-(8-methoxy-4H-thiazolo[5,4-b]indol-2-yl)-L-cysteine and 4-hydroxy-3-(4-methoxy-1H-indol-3-yl)-2-thioxothiazolidine-4-carboxylic acid. That is, both fungal pathogens metabolized and detoxified rapalexin A by addition of the thiol group
研究了植物抗毒素 rapalexin A(一种由十字花科植物(十字花科)产生的独特吲哚异硫氰酸酯 (ITC))的代谢。检查了三种植物病原真菌物种:Colletotrichum dematium (Pers.:Fr.) Grove,一种广泛的宿主范围病原体,C. higginsianum Sacc.,一种十字花科的宿主选择性病原体和 C. lentis Damm,一种宿主选择性的扁豆病原体(Lens culinaris Medik。)。C. dematium 和 C. higginsianum 对 rapalexin A 的代谢相似,通过一个共同的中间途径和两个不同的途径发生,但 C. lentis 无法转化 rapalexin A。C. higginsianum 和 C. dematium 都将 rapalexin A 转化为两种先前未描述的代谢物,其结构已通过化学合成证实:N-乙酰基-S-(8-甲氧基-4H-噻唑啉[5