New insights into ergot alkaloid biosynthesis in Claviceps purpurea: An agroclavine synthase EasG catalyses, via a non-enzymatic adduct with reduced glutathione, the conversion of chanoclavine-I aldehyde to agroclavine
作者:Marco Matuschek、Christiane Wallwey、Xiulan Xie、Shu-Ming Li
DOI:10.1039/c0ob01215g
日期:——
of fungi with Claviceps purpurea as the most important producer for medical use. Chanoclavine-I aldehyde is proposed as a branch point via festuclavine or pyroclavine to clavine-type alkaloids in Trichocomaceae and via agroclavine to ergoamides and ergopeptines in Clavicipitaceae. Here we report the conversion of chanoclavine-I aldehyde to agroclavine by EasG from Claviceps purpurea, a homologue of
麦角生物碱是 吲哚具有多种结构和生物活性的衍生物。它们是由各种真菌与锁骨产生的紫癜作为最重要的医疗用途生产商。有人建议将Chanoclavine-I醛作为经由Festuclavine或pyroclavine的分支点锁骨毛癣菌科中的生物碱型生物碱,通过农杆菌的生物碱类到克拉维虫科中的麦角酰胺和麦角肽碱。在这里,我们通过EASG从报告裸麦角碱-I醛转化成田麦角碱麦角紫癜,烟曲霉中Festuclavine合酶FgaFS的同源物,在降低的情况下。谷胱甘肽 和 NADPH。EasG包含290个氨基酸,分子量约为31.9 kDa。在大肠杆菌中过量生产后,通过亲和层析纯化可溶性单体His 6 -EasG,并用于酶分析。通过NMR和MS分析清楚地阐明了农锁藤的结构。