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Related Experiment Video

Updated: May 8, 2026

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

Published on: January 26, 2016

Performance optimization of ultrashort antimicrobial peptides through backbone amide cyclization.

Ruoxin Tian¹, Min Yang², Kaixun Cao²

¹Department of Molecular and Cell Biology, School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China; State Key Laboratory of Genetic Evolution and Animal Models, Engineering Laboratory of Peptides of Chinese Academy of Sciences, Key Laboratory of Bioactive Peptides of Yunnan Province, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, National Resource Center for Non-Human Primates, Kunming Institute of Zoology, National Research Facility for Phenotypic and Genetic Analysis of Model Animals (Primate Facility), Sino-African Joint Research Center, New Cornerstone Science Laboratory, Chinese Academy of Sciences, No. 17 Longxin Road, Kunming, Yunnan, 650201, China.

European Journal of Medicinal Chemistry

|May 6, 2026

Summary

Researchers engineered ultrashort cyclic antimicrobial peptides (AMPs) with enhanced potency and stability. This novel approach combats antimicrobial resistance by stabilizing peptide structure for effective bacterial membrane targeting.

Keywords:

Antimicrobial peptides Cyclization Hydrophobicity Rational modification Ultra-short peptide

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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

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Published on: September 28, 2022

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Last Updated: May 8, 2026

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

Published on: January 26, 2016

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

Published on: September 28, 2022

Area of Science:

Biochemistry and Molecular Biology
Medicinal Chemistry
Microbiology

Background:

Antimicrobial resistance (AMR) necessitates novel therapeutic strategies.
Ultrashort antimicrobial peptides (AMPs) offer manufacturability but often lose activity due to conformational instability.
A strategy to engineer stable, potent ultrashort AMPs is needed.

Purpose of the Study:

To develop a conformational engineering strategy for ultrashort AMPs.
To restore and enhance the antibacterial activity of minimized AMPs.
To assess the therapeutic potential of engineered ultrashort cyclic AMPs.

Main Methods:

Identified a minimal Trp/Lys/Arg-rich motif from a cathelicidin template (ZY4).
Generated an ultrashort cyclic peptide (WKR-cyl) using backbone amide cyclization.
Evaluated antibacterial potency, membrane selectivity, stability, and in vivo efficacy against MRSA.

Main Results:

WKR-cyl demonstrated enhanced antibacterial potency, membrane selectivity, and proteolytic stability compared to linear analogs.
Amide cyclization stabilized membrane-active conformations and increased hydrophobic interactions for efficient membrane insertion.
WKR-cyl showed potent activity against MRSA, anti-biofilm effects, high plasma stability, minimal resistance induction, and therapeutic efficacy in murine models.

Conclusions:

Backbone amide cyclization is an effective strategy to restore and enhance ultrashort AMP function.
WKR-cyl exhibits promising characteristics for development as a clinically translatable anti-infective peptide.
This approach addresses the challenge of conformational instability in minimized AMPs for combating AMR.