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Herbicidins are adenosine-based nucleoside antibiotics with an unusual tricyclic undecose core decorated with a (5-hydroxy)tiglyl moiety. Feeding studies are herein reported demonstrating that the tricyclic core is derived from d-glucose and d-ribose, whereas the tiglyl moiety is derived from an intermediate of l-isoleucine catabolism. Identification of the gene cluster for herbicidin A biosynthesis in Streptomyces sp. L-9-10 as well as its verification by heterologous expression in a nonproducing host are described, and the results of in vitro characterization of a carboxyl methyltransferase encoded in the cluster, Her8, are presented. Based on these observations, a biosynthetic pathway is proposed for herbicidins.

journal of the american chemical society

Identification and Interrogation of the Herbicidin Biosynthetic Gene Cluster: First Insight into the Biosynthesis of a Rare Undecose Nucleoside Antibiotic