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Recently, we isolated a new thiopeptide antibiotic, TP-1161, from the fermentation broth of a marine actinomycete typed as a member of the genus Nocardiopsis. Here we report the identification, isolation, and analysis of the TP-1161 biosynthetic gene cluster from this species. The gene cluster was identified by mining a draft genome sequence using the predicted structural peptide sequence of TP-1161. Functional assignment of a ∼16-kb genomic region revealed 13 open reading frames proposed to constitute the TP-1161 biosynthetic locus. While the typical core set of thiopeptide modification enzymes contains one cyclodehydratase/dehydrogenase pair, paralogous genes predicted to encode additional cyclodehydratases and dehydrogenases were identified. Although attempts at heterologous expression of the TP-1161 gene cluster in Streptomyces coelicolor failed, its identity was confirmed through the targeted gene inactivation in the original host.

Isolation and Characterization of the Gene Cluster for Biosynthesis of the Thiopeptide Antibiotic TP-1161