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Published on: December 21, 2019
In silico and in vitro characterization of VC15, a short peptide derived from Pin2
Zuriel González-Carrera1, Adriana Morales-Martínez1, Brandt Bertrand2
1Laboratorio de Estructura Función e Ingeniería de Proteínas, Centro de Investigación en Biotecnología. Universidad Autónoma del Estado de Morelos. Av. Universidad 1001, C.P. 62209, Cuernavaca, Morelos, Mexico.
Antimicrobial peptides (AMPs) show promise but often cause toxicity. This study found that VC15, a novel peptide, retains antibacterial activity while demonstrating reduced cytotoxicity and improved selectivity against bacterial membranes compared to conventional antibiotics.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Antimicrobial peptides (AMPs) are crucial components of the innate immune system and potential alternatives to conventional antibiotics.
- Clinical applications of AMPs are hindered by issues like cytotoxicity and poor selectivity.
- Understanding the mechanism of action and membrane interaction is key to developing safer AMPs.
Purpose of the Study:
- To investigate the mechanism of action and biological activity of VC15, a peptide derived from Pin2.
- To compare the membrane interaction and biological activity of VC15 with its parent peptide, Pin2.
- To evaluate the potential of VC15 as a selective antimicrobial agent with an improved safety profile.
Main Methods:
- Molecular dynamics simulations of peptide-membrane interactions in bacterial and mammalian membrane models.
- Liposome leakage assays to assess membrane-disruptive activity.
- Determination of antimicrobial activity (MIC) against Streptococcus agalactiae and Escherichia coli.
- Evaluation of hemolytic activity and cytotoxicity in mammalian cell lines.
Main Results:
- Both VC15 and Pin2 peptides anchor to membranes via aromatic residues, primarily phenylalanine and tryptophan.
- VC15 exhibits reduced membrane penetration, hydrophobic interactions, and deformation compared to Pin2, particularly in mammalian membranes.
- VC15 demonstrates selective antibacterial activity against Streptococcus agalactiae with significantly lower membrane disruption, hemolytic activity, and cytotoxicity than Pin2.
- VC15 shows lower efficacy against Escherichia coli compared to Pin2.
Conclusions:
- VC15 retains potent antibacterial activity against certain pathogens while exhibiting significantly reduced membrane disruption and cytotoxicity.
- The findings highlight VC15's potential as a selective antimicrobial candidate with an improved safety profile for clinical applications.
- Further research into VC15 could lead to the development of novel therapeutics to combat antibiotic resistance.
