Magainin

Magainin is a family of antimicrobial peptides found in the skin of the African clawed frog (Xenopus laevis). The peptides were first isolated by Michael Zasloff in 1987, who named them after the Hebrew word for "shield". Magainins have been found to have a broad spectrum of antimicrobial activity against bacteria, fungi, and protozoa.

Structure and Function

Magainins are composed of 21-27 amino acids and are amphipathic, meaning they have both hydrophilic and hydrophobic regions. This allows them to interact with the lipid bilayer of cell membranes. The peptides form a helical structure when in contact with the lipid bilayer, which allows them to insert into the membrane and form pores. This disrupts the integrity of the membrane, leading to cell death.

Medical Applications

Due to their antimicrobial properties, magainins have potential for use in medical applications. They have been studied for use in treating infections, cancer, and as contraceptives. However, their use has been limited by issues with stability and toxicity.

See Also

• Antimicrobial peptides
• Xenopus laevis
• Michael Zasloff

References

Magainin Resources
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