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

Abstract

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.

Authors:
 [1];  [1];  [2];  [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
  2. National Research Council of Canada, Saskatoon (Canada)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Institutes of Health (NIH)
OSTI Identifier:
1438880
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 114; Journal Issue: 25; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
ENGLISH
Subject:
59 BASIC BIOLOGICAL SCIENCES; RiPP; biosynthesis; peptide; plant; orbitide

Citation Formats

Chekan, Jonathan R., Estrada, Paola, Covello, Patrick S., and Nair, Satish K. Characterization of the macrocyclase involved in the biosynthesis of RiPP cyclic peptides in plants. United States: N. p., 2017. Web. doi:10.1073/pnas.1620499114.
Chekan, Jonathan R., Estrada, Paola, Covello, Patrick S., & Nair, Satish K. Characterization of the macrocyclase involved in the biosynthesis of RiPP cyclic peptides in plants. United States. https://doi.org/10.1073/pnas.1620499114
Chekan, Jonathan R., Estrada, Paola, Covello, Patrick S., and Nair, Satish K. Mon . "Characterization of the macrocyclase involved in the biosynthesis of RiPP cyclic peptides in plants". United States. https://doi.org/10.1073/pnas.1620499114. https://www.osti.gov/servlets/purl/1438880.
@article{osti_1438880,
title = {Characterization of the macrocyclase involved in the biosynthesis of RiPP cyclic peptides in plants},
author = {Chekan, Jonathan R. and Estrada, Paola and Covello, Patrick S. and Nair, Satish K.},
abstractNote = {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.},
doi = {10.1073/pnas.1620499114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 25,
volume = 114,
place = {United States},
year = {Mon Jun 05 00:00:00 EDT 2017},
month = {Mon Jun 05 00:00:00 EDT 2017}
}

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