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A Bioinspired Mastoparan Exhibits Concentration-Dependent Anti-Bacterial Activity via Membrane Disruption
Gisele R Rodrigues1,2, Marco Fornasier2, Lucrezia Caselli2
1Centro de Análises Proteômicas e Bioquímicas, Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília, Distrito Federal 70790160, Brazil.
ACS Applied Materials & Interfaces
|November 24, 2025
Summary
This study reveals how mastoparan peptides disrupt lipid membranes, offering insights into antimicrobial peptide mechanisms. The research highlights peptide surface activity and its concentration-dependent effects on membrane integrity.
Area of Science:
- Biophysics
- Biochemistry
- Membrane Biophysics
Background:
- Antimicrobial peptides (AMPs) are crucial in innate immunity, but their physicochemical mechanisms of action on lipid membranes remain unclear.
- Understanding AMP-membrane interactions is vital for developing new antimicrobial strategies.
Purpose of the Study:
- To investigate the physicochemical interactions between a bioinspired mastoparan peptide (mast-MO) and model lipid membranes.
- To elucidate the mechanism by which mast-MO affects membrane organization and integrity.
Main Methods:
- Utilized a bioinspired mastoparan (mast-MO) and characterized its interactions with supported lipid bilayers and vesicles.
- Employed complementary physicochemical techniques to analyze peptide surface activity and membrane property alterations.
- Validated the mechanism of action in vitro against Gram-negative E. coli.
Main Results:
- Mast-MO exhibits intrinsic surface activity, disrupting lipid packing in a concentration-dependent manner.
- Changes in ionic strength and pH modulate electrostatic interactions, reducing mast-MO adsorption to membranes.
- Demonstrated rapid and potent antimicrobial activity against E. coli.
Conclusions:
- Mastoparan peptide action is linked to surface activity, leading to membrane disruption.
- Environmental factors like ionic strength and pH significantly influence peptide-membrane interactions.
- Mast-MO shows potential as a rapid-acting antimicrobial agent against Gram-negative bacteria.
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