Characterization of Sviceucin from Streptomyces Provides Insight into Enzyme Exchangeability and Disulfide Bond Formation in Lasso Peptides

ACS Chemical Biology
Yanyan LiSylvie Rebuffat

Abstract

Lasso peptides are bacterial ribosomally synthesized and post-translationally modified peptides. They have sparked increasing interest in peptide-based drug development because of their compact, interlocked structure, which offers superior stability and protein-binding capacity. Disulfide bond-containing lasso peptides are rare and exhibit highly sought-after activities. In an effort to expand the repertoire of such molecules, we heterologously expressed, in Streptomyces coelicolor, the gene cluster encoding sviceucin, a type I lasso peptide with two disulfide bridges originating from Streptomyces sviceus, which allowed it to be fully characterized. Sviceucin and its reduced forms were characterized by mass spectrometry and peptidase digestion. The three-dimensional structure of sviceucin was determined using NMR. Sviceucin displayed antimicrobial activity selectively against Gram-positive bacteria and inhibition of fsr quorum sensing in Enterococcus faecalis. This study adds sviceucin to the type I lasso peptide family as a new representative. Moreover, new clusters encoding disulfide-bond containing lasso peptides from Actinobacteria were identified by genome mining. Genetic and functional analyses revealed that the formation...Continue Reading

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