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Methionine epimerization in cyclic peptides.

Pramodkumar D Jadhav1, Jianheng Shen1, Peta-Gaye Burnett1

  • 1Department of Plant Sciences, University of Saskatchewan Saskatoon SK S7N 5A8 Canada pramodkumar.jadhav@usask.ca martin.reaney@usask.ca.

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This summary is machine-generated.

Researchers epimerized flax cyclic peptides containing methionine (Met) under mild alkaline conditions. This novel method creates d-amino acid isomers, useful for biomolecule functionalization and as biomarkers.

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Area of Science:

  • Biochemistry
  • Organic Chemistry
  • Peptide Chemistry

Background:

  • Flax cyclic peptides are bioactive molecules.
  • Methionine (Met) is an amino acid susceptible to oxidation.
  • Epimerization of cyclic peptides is challenging.

Purpose of the Study:

  • To achieve regio-selective epimerization of Met in flax cyclic peptides.
  • To explore the impact of Met oxidation state and ring size on epimerization.
  • To develop a novel strategy for biomolecule functionalization.

Main Methods:

  • Treatment of flax cyclic octa- and nona-peptides with mild alkaline conditions.
  • Analysis of epimerization rates based on Met oxidation state and ring size.
  • Confirmation of amino acid configurations using Marfey derivatizations.
  • Cytotoxicity studies of resulting isomers.

Main Results:

  • Successful regio-selective epimerization at the Met α-proton in a single chemical step.
  • Epimerization rates varied significantly with Met oxidation state and ring size.
  • Distinct cytotoxicity profiles were observed for the d-amino isomers.
  • A Met alkylation strategy was developed for novel functionalization.

Conclusions:

  • Mild alkaline treatment provides a novel route for cyclic peptide epimerization.
  • The generated d-amino analogs offer potential as biomarkers in plant protein processing.
  • These analogs have implications for biomedical applications and biomolecule functionalization.