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Biochem J. 1994 Mar 15; 298(Pt 3): 623–628.
PMCID: PMC1137905

Characterization of the antimicrobial peptide derived from sapecin B, an antibacterial protein of Sarcophaga peregrina (flesh fly).


Sapecin B, an antibacterial protein of Sarcophaga peregrina, was divided into four peptides. A hendecapeptide derived from its helix region was found to have comparable antibacterial activity with that of the complete protein. This peptide had a much wider spectrum of antimicrobial activity than that of sapecin B, exhibiting activity on not only Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative), but also some yeasts, including Candida albicans. The peptide was shown to bind to liposomes containing acidic phospholipids and cause release of entrapped glucose, suggesting that its primary site of action is the bacterial membrane. Its antimicrobial activity could be increased by substituting various amino acid residues for hydrophobic and/or basic ones.

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