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Updated: Jan 10, 2026

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
Published on: September 28, 2022
AEP-mediated backbone cyclization of cyclotides-A chemoenzymatic method for cyclotide production
Yan Zhou1, Simon J de Veer1, Thomas Durek1
1Institute for Molecular Bioscience, Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, QLD, Australia.
None:
Cyclotides are a unique class of head-to-tail cyclic peptides with exceptional stability, making them promising scaffolds for therapeutic and agrochemical applications. Their biosynthesis in plants involves asparaginyl endopeptidases (AEPs), which catalyze backbone cyclization through transpeptidation. This chapter presents a detailed chemoenzymatic method for producing cyclotides using AEP-mediated cyclization, focusing on the model cyclotide kalata B1. The method leverages the high efficiency and specificity of AEPs, enabling cyclization of folded substrates without the need for protecting groups or harsh chemical reagents. This approach is scalable and adaptable to other cyclotides and bioactive peptides, offering a robust platform for generating stable, cyclic peptides with enhanced therapeutic potential.
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