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Structural Analysis of Class I Lanthipeptides from NL19 Reveals an Unusual Ring Pattern

Overview
Journal ACS Chem Biol
Specialties Biochemistry
Biology
Date 2021 Jun 4
PMID 34085816
Citations 21
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Abstract

Lanthipeptides are ribosomally synthesized and post-translationally modified peptide natural products characterized by the presence of lanthionine and methyllanthionine cross-linked amino acids formed by dehydration of Ser/Thr residues followed by conjugate addition of Cys to the resulting dehydroamino acids. Class I lanthipeptide dehydratases utilize glutamyl-tRNA as a cosubstrate to glutamylate Ser/Thr followed by glutamate elimination. A vast majority of lanthipeptides identified from class I synthase systems have been from Gram-positive bacteria. Herein, we report the heterologous expression and modification in of two lanthipeptides from the Gram-negative Bacteroidetes NL19. These peptides are representative of a group of compounds frequently encoded in genomes. Structural characterization of the lanthipeptides revealed a novel ring pattern as well as an unusual ll-lanthionine stereochemical configuration and a cyclase that lacks the canonical zinc ligands found in most LanC enzymes.

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