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The primary bactericidal domain of CAP37, a cationic antimicrobial protein with potent activity against Gram-negative organisms was previously shown to reside between amino acids 20 through 44 (NQGRHFCGGALIHARFVMTAASCFQ) of the native protein. In this study, we explored the efficacy of four synthetic CAP37 peptide analogs, based on this sequence, against various Candida species including fluconazole-sensitive and -resistant isolates of C. albicans. Three of the peptides demonstrated strong antifungal activity for C. albicans, including fluconazole-resistant isolates of C. albicans and were active against C. guilliermondii, C. tropicalis, C. pseudotropicalis, C. parapsilosis, and C. dubliniensis. The peptides were ineffective against C. glabrata, C. krusei, and Saccharomyces cerevisiae. For C. albicans isolates, the peptides had relatively greater activity against blastoconidia than hyphal forms, although strong antifungal activity was observed with pseudohyphal forms of the various Candida species tested. Kinetic studies demonstrated fungicidal rather than fungistatic activity. These findings indicate that synthetic peptides based on the antimicrobial domain of CAP37 also have activity against eukaryotic organisms suggesting a broader range of activity than originally demonstrated and show for the first time their potent fungicidal activity.

Candidacidal activity of synthetic peptides based on the antimicrobial domain of the neutrophil-derived protein, CAP37