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Mechanistic Understanding of Lanthipeptide Biosynthetic Enzymes

Author:
Repka, Lindsay M., Chekan, Jonathan R., Nair, Satish K., van der Donk, Wilfred A.
Source:
Chemical Reviews 2017 v.117 no.8 pp. 5457-5520
ISSN:
1520-6890
Subject:
amino acids, antimicrobial properties, bacteriocins, crosslinking, enzymes, peptides, post-translational modification
Abstract:
Lanthipeptides are ribosomally synthesized and post-translationally modified peptides (RiPPs) that display a wide variety of biological activities, from antimicrobial to antiallodynic. Lanthipeptides that display antimicrobial activity are called lantibiotics. The post-translational modification reactions of lanthipeptides include dehydration of Ser and Thr residues to dehydroalanine and dehydrobutyrine, a transformation that is carried out in three unique ways in different classes of lanthipeptides. In a cyclization process, Cys residues then attack the dehydrated residues to generate the lanthionine and methyllanthionine thioether cross-linked amino acids from which lanthipeptides derive their name. The resulting polycyclic peptides have constrained conformations that confer their biological activities. After installation of the characteristic thioether cross-links, tailoring enzymes introduce additional post-translational modifications that are unique to each lanthipeptide and that fine-tune their activities and/or stability. This review focuses on studies published over the past decade that have provided much insight into the mechanisms of the enzymes that carry out the post-translational modifications.
Agid:
5677902