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Bacterial Peptide Display for the Selection of Novel Biotinylating Enzymes
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Self-Assembled Peptide Nanofibers Display Natural Antimicrobial Peptides to Selectively Kill Bacteria without
Weike Chen, Su Yang, Shuxin Li
1Department of Chemistry and Biochemistry, Stephenson Life Sciences Research Center , University of Oklahoma , Norman , Oklahoma 73019 , United States.
ACS Applied Materials & Interfaces
|July 23, 2019
Summary
Researchers developed a novel antimicrobial peptide (AMP) delivery system using self-assembling nanofibers. This strategy enhances bacterial cell membrane disruption while minimizing harm to mammalian cells, improving safety for therapeutic applications.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Microbiology
Background:
- Antimicrobial peptides (AMPs) face challenges in selective bacterial killing due to mammalian cell cytotoxicity.
- Existing nanoparticle-based AMP delivery systems have not fully resolved this selectivity issue.
Purpose of the Study:
- To develop a cytocompatible antimicrobial material by integrating natural AMPs with synthetic peptides.
- To create self-assembled supramolecular nanofibers for controlled AMP presentation and enhanced antimicrobial selectivity.
Main Methods:
- Association of a natural AMP (melittin) with a β-sheet-forming synthetic peptide.
- Self-assembly into supramolecular nanofibers for controlled AMP presentation at the nanofiber-solvent interface.
- Evaluation of membrane permeability and cytocompatibility using bacterial and mammalian cell models.
Main Results:
- The nanofiber presentation modulated melittin's conformation, reducing hydrophobic interactions with cell membranes.
- AMP-displaying nanofibers preferentially permeabilized bacterial membranes over mammalian cell membranes.
- Demonstrated improved membrane selectivity and cytocompatibility through live-dead assays and membrane localization studies.
Conclusions:
- The developed AMP-displaying nanofibers offer a promising strategy for safer and more effective antimicrobial therapies.
- This approach enhances the cytocompatibility of AMPs, reducing off-target effects on host cells.
- These antimicrobial assemblies can serve as building blocks for advanced biomedical applications like tissue engineering.
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