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Synthetic Bactericidal Peptide Based on CAP37: A 37-kDa Human Neutrophil Granule-Associated Cationic Antimicrobial Protein Chemotactic for Monocytes
H. Anne Pereira, Imre Erdem, Jan Pohl and John K. Spitznagel
Proceedings of the National Academy of Sciences of the United States of America
Vol. 90, No. 10 (May 15, 1993), pp. 4733-4737
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/2362153
Page Count: 5
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CAP37 (cationic antimicrobial protein of molecular mass 37 kDa) is a multifunctional protein isolated from the granules of human neutrophils. It is antibiotic and chemotactic and binds lipopolysaccharide. A synthetic peptide, amino acid sequence NQGRHFCGGALIHARFVMTAASCFQ, based on residues 20-44 of CAP37 protein mimics its antibiotic and lipopolysaccharide binding action. Peptide 20-44, at the concentrations tested, has antibacterial activity against Salmonella typhimurium, Pseudomonas aeruginosa, Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus. The bactericidal action of the peptide was pH dependent, with maximum activity at pH 5.0 and pH 5.5 and decreased activity at pH 7.0. Various truncations, substitutions, and other modifications in the sequence deteriorate its activity. Free sulfhydryl groups and/or disulfide bridge formation are required for optimum antibiotic activity, since substitution of serines for, or alkylation of, cysteine residues 26 and 42 eliminates bactericidal activity. Evidently amino acids 20-44 represent an important, perhaps principal, antibacterial domain of CAP37. This peptide should provide new insight into the mechanism of antimicrobial activity of CAP37 and may serve as a model for new, useful, synthetic antibiotics.
Proceedings of the National Academy of Sciences of the United States of America © 1993 National Academy of Sciences