The biosynthesis of the pyrrolyl moiety of the fungal metabolite rumbrin originates from pyrrole-2-carboxylic acid. In an effort to produce novel derivatives with enhanced biological activity a series of substituted pyrrole-2-carboxylates were synthesised and incubated with the producing organism, Auxarthron umbrinum. Several 4-halo-pyrrole-2-carboxylic acids were incorporated into the metabolite yielding three new derivatives: 3-fluoro-, 3-chloro- and 3-bromo-isorumbrin, which were generated in milligram quantities enabling cytotoxicity assays to be conducted. The 3-chloro- and 3-bromo-isorumbrins had improved activity against HeLa cells compared with rumbrin; 3-bromoisorumbrin also showed dramatically improved activity towards a lung cancer cell line (A549).
真菌代谢物rumbrin的
吡咯基部分的
生物合成起源于
吡咯-2-羧酸。为了生产具有增强
生物活性的新品系,合成了一系列取代的
吡咯-2-羧酸酯,并与生产宿主Auxarthron umbrinum进行培养。将几种4-卤
吡咯-2-羧酸纳入代谢物中,得到了三个新衍
生物:3-
氟-、3-
氯-和3-溴-异rumbrin,生成量在毫克范围,使细胞毒性实验得以进行。与rumbrin相比,3-
氯-和3-溴-异rumbrin在HeLa细胞上显示出更好的活性;3-溴-异rumbrin对肺癌
细胞系(A549)也显示出显著改善的活性。