期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 20, 页码 8228-8238出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b01519
关键词
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资金
- Robert C. and Carolyn J. Springborn Endowment
- National Science Foundation [DGE-1144245]
- Chemistry-Biology Interface Research Training Program [2T32 GM070421]
- National Institutes of Health [GM123998]
Recently developed bioinformatic tools have bolstered the discovery of ribosomally synthesized and post-translationally modified peptides (RiPPs). Using an improved version of Rapid ORF Description and Evaluation Online (RODEO 2.0), a biosynthetic gene cluster mining algorithm, we bioinformatically mapped the sactipeptide RiPP class via the radical S-adenosylmethionine (SAM) enzymes that form the characteristic sactionine (sulfur-to-alpha carbon) cross-links between cysteine and acceptor residues. Hundreds of new sactipeptide biosynthetic gene clusters were uncovered, and a novel sactipeptide huazacin with growth-suppressive activity against Listeria monocytogenes was characterized. Bioinformatic analysis further suggested that a group of sactipeptide-like peptides heretofore referred to as six cysteines in forty-five residues (SCIFFs) might not be sactipeptides as previously thought. Indeed, the bioinformatically identified SCIFF peptide freyrasin was demonstrated to contain six thioethers linking the beta carbons of six aspartate residues. Another SCIFF, thermocellin, was shown to contain a thioether cross-linked to the gamma carbon of threonine. SCIFFs feature a different paradigm of non-alpha carbon thioether linkages, and they are exclusively formed by radical SAM enzymes, as opposed to the polar chemistry employed during lanthipeptide biosynthesis. Therefore, we propose the renaming of the SCIFF family as radical non-alpha thioether peptides (ranthipeptides) to better distinguish them from the sactipeptide and lanthipeptide RiPP classes.
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