Overview
Magainin-2 is a 23-amino acid amphipathic alpha-helical antimicrobial peptide first isolated from the skin of the African clawed frog Xenopus laevis by Michael Zasloff in 1987. Its discovery was seminal in establishing the field of antimicrobial peptide research. Magainin-2 exhibits potent broad-spectrum antimicrobial activity against bacteria, fungi, and protozoa with minimal mammalian cell toxicity, making it a primary structural template for synthetic antibiotic drug development.
Mechanism of Action
In solution, magainin-2 adopts a random coil conformation, but upon contact with bacterial membranes it undergoes a structural transition to an amphipathic alpha-helix. The helix inserts into the lipid bilayer and aggregates to form toroidal pores through a mechanism involving lipid reorganization alongside peptide monomers. This pore formation causes rapid membrane depolarization and leakage of cytoplasmic contents. The peptide's selectivity for bacterial over mammalian membranes arises from its preference for negatively charged phospholipids (phosphatidylglycerol, cardiolipin) over zwitterionic phosphatidylcholine.
Potential Benefits
- Potent broad-spectrum antibacterial activity
- Antifungal activity
- Antiprotozoal activity
- Low mammalian cytotoxicity
- Foundational template for antibiotic drug development programs
- Activity against drug-resistant bacteria
Research Dosage Notes
The following reflects doses used in published research studies. This is not medical advice.
No approved therapeutic dosing. Used in antimicrobial peptide research as reference compound.
Amino Acid Sequence
Gly-Ile-Gly-Lys-Phe-Leu-His-Ser-Ala-Lys-Lys-Phe-Gly-Lys-Ala-Phe-Val-Gly-Glu-Ile-Met-Asn-Ser-NH2
Side Effects & Safety
- Hemolytic at high concentrations
- Local irritation in topical applications
Synergistic Compounds
The following compounds have been studied alongside Magainin-2 for potential complementary or synergistic effects:
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References & Further Reading
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