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Characterization of the macrocyclase involved in the biosynthesis of RiPP cyclic peptides in plants

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [2];  [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
  2. National Research Council of Canada, Saskatoon (Canada)
Enzymes that can catalyze the macrocyclization of linear peptide substrates have long been sought for the production of libraries of structurally diverse scaffolds via combinatorial gene assembly as well as to afford rapid in vivo screening methods. Orbitides are plant ribosomally synthesized and posttranslationally modified peptides (RiPPs) of various sizes and topologies, several of which are shown to be biologically active. The diversity in size and sequence of orbitides suggests that the corresponding macrocyclases may be ideal catalysts for production of cyclic peptides. Here we present the biochemical characterization and crystal structures of the plant enzyme PCY1 involved in orbitide macrocyclization. These studies demonstrate how the PCY1 S9A protease fold has been adapted for transamidation, rather than hydrolysis, of acyl-enzyme intermediates to yield cyclic products. Notably, PCY1 uses an unusual strategy in which the cleaved C-terminal follower peptide from the substrate stabilizes the enzyme in a productive conformation to facilitate macrocyclization of the N-terminal fragment. The broad substrate tolerance of PCY1 can be exploited as a biotechnological tool to generate structurally diverse arrays of macrocycles, including those with nonproteinogenic elements.
Research Organization:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Organization:
National Institutes of Health (NIH)
OSTI ID:
1438880
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 25 Vol. 114; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (9)

A family of small, cyclic peptides buried in preproalbumin since the Eocene epoch journal February 2018
Characterization of the Fast and Promiscuous Macrocyclase from Plant PCY1 Enables the Use of Simple Substrates journal January 2018
Structural basis of ribosomal peptide macrocyclization in plants journal January 2018
Insights into AMS/PCAT transporters from biochemical and structural characterization of a double Glycine motif protease journal January 2019
Characterization of a dual function macrocyclase enables design and use of efficient macrocyclization substrates journal October 2017
Bypassing the proline/thiazoline requirement of the macrocyclase PatG journal January 2017
Gene-guided discovery and engineering of branched cyclic peptides in plants journal October 2018
Structural determinants for peptide-bond formation by asparaginyl ligases journal May 2019
Vacuolar processing enzymes in the plant life cycle journal December 2019

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