Characterization of the<i>N</i>-methyltransferases involved in the biosynthesis of toxoflavin, fervenulin and reumycin from<i>Streptomyces hiroshimensis</i>ATCC53615
作者:Can Su、Yijun Yan、Xiaowei Guo、Jianying Luo、Chongxi Liu、Zhouxin Zhang、Wen-Sheng Xiang、Sheng-Xiong Huang
DOI:10.1039/c8ob02847h
日期:——
reumycin (3), known to be produced by plant pathogen Burkholderia glumae BGR1, are structurally related 7-azapteridine antibiotics. Previous biosynthetic studies revealed that N-methyltransferase ToxA from B. glumae BGR1 catalyzed the sequential methylation at N6 and N1 in pyrimido[5,4-e]-as-triazine-5,7(6H,8H)-dione (4) to generate 1. However, the N8 methylation of 4 in the biosynthesis of fervenulin
已知由植物病原体伯克霍尔德氏菌BGR1产生的毒素黄素(1),铁蛋白(2)和瑞霉素(3)是与结构相关的7-氮杂哌啶类抗生素。先前的生物合成研究表明,来自B. glumae BGR1的N-甲基转移酶ToxA催化了嘧啶[5,4 - e ] -as-triazine-5,7(6 H,8 H)-dione(4)产生1。然而,在铁蛋白的生物合成中N 4的N 8甲基化仍不清楚。探索N-methyltransferases所需的生物合成1和2,我们鉴定和表征的fervenulin和toxoflavin在生物合成基因簇S. hiroshimensis ATCC53615。根据四个N-甲基转移酶基因失活突变体积累的中间体结构和系统的酶促甲基化反应,提出了1和2生物合成中甲基化顺序的调节步骤。所述Ñ -methylation顺序和路线在fervenulin和toxoflavin生物合成S. hiroshimen