作者:Feifei Qi、Wei Zhang、Yingying Xue、Ce Geng、Xuenian Huang、Jia Sun、Xuefeng Lu
DOI:10.1021/jacs.1c07182
日期:2021.10.13
believed to be a crucial step in fungal seco-anthraquinone biosynthesis and has long been proposed as a classic Baeyer–Villiger oxidation. Nonetheless, genetic, enzymatic, and chemical information on ring opening remains elusive. Here, a revised questin ring-opening mechanism was elucidated by in vivo gene disruption, in vitro enzymatic analysis, and 18O chasing experiments. It has been confirmed that the
蒽醌的 C-10–C-4a 键断裂被认为是真菌环蒽醌生物合成的关键步骤,并且长期以来被认为是经典的 Baeyer-Villiger 氧化。尽管如此,有关开环的遗传、酶学和化学信息仍然难以捉摸。在这里,通过体内基因破坏、体外酶分析和18 O 追逐实验阐明了修订后的 questin 开环机制。已证实还原酶 GedF 负责在 NADPH 的帮助下将 questin 中 C-10 的酮基还原为羟基。生成的 questin 对苯二酚的 C-10–C-4a 键随后被非典型的无辅因子双加氧酶 GedK 裂解,产生去甲基磺酰氯。这种双酶催化和双氧化介导的蒽醌开环反应显示出普遍性。