Reevaluation of the Final Steps in the Biosynthesis of Blasticidin S by Streptomyces griseochromogenes and Identification of a Novel Self-Resistance Mechanism
作者:Qibo Zhang、Martha C Cone、Steven J Gould、T Mark Zabriskie
DOI:10.1016/s0040-4020(99)01060-1
日期:2000.1
steps in the biosynthesis of the antifungal peptidyl-nucleoside blasticidin S (3) have been revised to include a novel self-resistance mechanism wherein the previously proposed final precursor, demethylblasticidin S (7), is modified with a leucine residue yielding leucyldemethylblasticidin S (10) which exhibits reduced antibiotic activity. Methylation of 10 yields leucylblasticidin S (9) which can
已修改抗真菌肽基核苷杀稻瘟素S(3)的生物合成的最终步骤,以包括一种新的自抗性机制,其中先前提出的最终前体去甲基杀稻瘟素S(7)被亮氨酸残基修饰,产生亮氨酰去甲基杀稻瘟素S (10)其抗生素活性降低。甲基化10产生亮杀菌素S(9),可以从细菌中出口并水解为3。还公开了杀稻瘟素S N-乙酰基转移酶活性的发现,该活性可以起到解毒3和7的作用。 在出口之前无意中产生或重新进入细胞。