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Updated: May 29, 2026
09:39
A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries
Published on: December 27, 2016
Anionic or Mixed-Charge Copolypeptides with Potent Antibiofilm Activities
Yu Liu1, Peng Wang1, Xu Zhang2
1Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China.
Biomacromolecules
|May 28, 2026
Summary
New copolypeptides effectively prevent and eradicate biofilms from Pseudomonas aeruginosa and Staphylococcus aureus without causing antibiotic resistance. These nonbactericidal materials offer a promising approach for treating bacterial biofilm-associated infections (BBAIs).
Area of Science:
- Biomaterials Science
- Infectious Diseases
- Polymer Chemistry
Background:
- Bacterial biofilm-associated infections (BBAIs) pose significant threats due to antibiotic resistance.
- Current treatments often face challenges with efficacy and resistance development.
- There is a critical need for novel antibiofilm strategies.
Purpose of the Study:
- To synthesize and evaluate anionic or mixed-charge copolypeptides for preventing and eradicating Pseudomonas aeruginosa and Staphylococcus aureus biofilms.
- To investigate the mechanism of action of these novel antibiofilm agents.
- To assess the in vivo efficacy and safety of the lead copolypeptide candidate.
Main Methods:
- Copolypeptides were synthesized using ring-opening polymerization and side-chain modifications.
- In vitro antibiofilm assays were performed to determine inhibition and eradication efficacies.
- Mechanism of action was studied through bacterial surface binding, EPS disruption, and virulence factor interaction assays.
- In vivo efficacy was evaluated in a mouse model of acute Pseudomonas aeruginosa lung infection.
Main Results:
- Anionic or mixed-charge copolypeptides, particularly F27E108 and F15E60K60, demonstrated high inhibition rates for P. aeruginosa biofilm formation (up to 96.6%).
- F27E108 achieved significant eradication of P. aeruginosa (98.8%) and S. aureus (91.6%) biofilms.
- The mechanism involves bacterial surface binding, disruption of extracellular polymeric substances, modulation of motility, and binding to virulence factors.
- F27E108 showed potent in vivo antibacterial effects and reduced inflammation in a mouse lung infection model.
Conclusions:
- Novel anionic or mixed-charge copolypeptides are effective nonbactericidal agents against P. aeruginosa and S. aureus biofilms.
- These copolypeptides offer a promising strategy for combating BBAIs without inducing bacterial resistance.
- The developed antibiofilm materials have potential for therapeutic applications in treating persistent bacterial infections.
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