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• W2077088192 abstract "Extended-spectrum beta-lactamase (ESBL)-producing Gram-negative bacteria are becoming increasingly prevalent and their antibiotic resistance necessitates novel therapeutic intervention. Ascaphin-8 is a cationic alpha-helical peptide that shows broad-spectrum antibacterial activity but is also toxic to human erythrocytes (LC(50)= 55 microM). This study assesses the activity of ascaphin-8, and a series of l-lysine-substituted analogs, against a range of clinical isolates of ESBL-producing bacteria. All ESBL-producing Escherichia coli (MIC=1.5-6 microM) and Klebsiella pneumoniae (MIC=12.5-25 microM) strains tested were susceptible to ascaphin-8, as well as a group of miscellaneous ESBL-producing strains (Citrobacter, Salmonella, Serratia, Shigella spp.) (MIC< or = 25 microM). The Lys4- and Lys8-substituted analogs were generally the most potent against bacteria but showed the highest hemolytic activity. However, the Lys10, Lys14, and Lys18 analogs also displayed potent antibacterial activity while showing very low hemolytic activity (LC50> 500 microM). An unexpected finding was the susceptibility of ESBL-producing Proteus mirabilis strains to ascaphin-8 (MIC=12.5-25 microM) and its Lys4-substituted analog (MIC= 6 microM), although non-ESBL isolates of this organism were resistant to these peptides (MIC> 100 microM)." @default.
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• W2077088192 date "2008-01-01" @default.
• W2077088192 modified "2023-09-27" @default.
• W2077088192 title "Activities of the frog skin peptide, ascaphin-8 and its lysine-substituted analogs against clinical isolates of extended-spectrum β-lactamase (ESBL) producing bacteria" @default.
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• W2077088192 doi "https://doi.org/10.1016/j.peptides.2007.10.026" @default.
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