Metabolism of the phytoalexins camalexins, their bioisosteres and analogues in the plant pathogenic fungus Alternaria brassicicola
作者:M. Soledade C. Pedras、Abbas Abdoli
DOI:10.1016/j.bmc.2013.05.026
日期:2013.8
The metabolism of the phytoalexins camalexin (1), 1-methylcamalexin (10) and 6-methoxycamalexin (11) by Alternaria brassicicola and their antifungal activity is reported. This work establishes that camalexins are slowly biotransformed (ca. six days) to the corresponding indole-3-thiocarboxamides, which are further transformed to the indole-3-carboxylic acids. These metabolites are substantially less
据报道,铜绿链霉菌对植物抗毒素camalexin(1),1-甲基camalexin(10)和6-甲氧基camalexin(11)的代谢及其抗真菌活性。这项工作建立了camalexins缓慢地生物转化(约六天)为相应的吲哚-3-硫代羧酰胺,然后将其进一步转化为吲哚-3-羧酸。这些代谢物对油菜曲霉的抑制作用远小于亲本卡莱姆毒素,表明这些酶介导的转化是解毒作用。此外,分析了卡莱姆毒素的合成异构体和生物异构体的代谢(1)表明噻唑环中的甘氨毒素的异构体没有被代谢。基于这些结果,提出了导致吲哚-3-硫代羧酰胺形成的潜在中间体。