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Updated: May 11, 2026

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

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Published on: January 26, 2016

Peptide fibrils with altered stability, activity, and cell selectivity.

Long Chen¹, Jun F Liang

¹Department of Chemistry, Chemical Biology, and Biomedical Engineering, Charles V. Schaefer School of Engineering and Sciences, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States.

Biomacromolecules

|May 30, 2013

Summary

New peptide aggregates (CL-1) show enhanced stability and selectively kill bacteria while sparing human cells. Controlling peptide self-assembly offers a promising strategy for developing stable and selective peptide therapeutics.

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Area of Science:

Biochemistry
Biomaterials Science
Drug Delivery

Background:

Peptides offer therapeutic advantages over proteins but suffer from poor stability and cell selectivity.
Existing lytic peptides face challenges in therapeutic applications due to these limitations.

Purpose of the Study:

To investigate the self-assembly of a novel lytic peptide (CL-1) into stable aggregates.
To evaluate the activity, stability, and cell selectivity of aggregated CL-1 compared to its monomeric form.
To explore the mechanisms underlying peptide-cell interactions and the role of self-assembly.

Main Methods:

Construction and characterization of the lytic peptide CL-1.
Assessment of CL-1 self-assembly into fibril-like structures under physiological conditions.
Comparative analysis of aggregated and monomeric CL-1 activity against bacteria and human cells.
Evaluation of CL-1 aggregate stability in human serum.
Investigation of peptide-cell interactions using lipid monolayers and live human tissue cells.

Main Results:

Peptide CL-1 self-assembled into dynamically stable, fibril-like aggregates.
Aggregated CL-1 exhibited enhanced stability in human serum (>5 hours) and selective cytotoxicity towards bacteria, sparing human cells.
Aggregated CL-1 showed reduced affinity and membrane insertion into human tissue cells compared to monomeric CL-1.
Aggregate dissociation and rearrangement were identified as crucial for the cytotoxicity of membrane-bound CL-1 aggregates.

Conclusions:

Peptide aggregation significantly impacts peptide-cell interactions, comparable to charge and secondary structure.
Controlling peptide self-assembly is a viable strategy to enhance the stability and cell selectivity of bioactive peptides.
This approach holds potential for broad biomedical applications of peptide therapeutics.