Antimicrobial activities of twenty lysine-peptoid hybrids against clinically relevant bacteria and fungi
Trine S Ryge1, Niels Frimodt-Møller, Paul R Hansen
1Department of Natural Sciences, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark.
Background:
This paper describes the antimicrobial activities of 20 lysine-peptoid hybrids against a selection of clinically relevant bacteria and fungi.
Methods:
Minimal inhibitory concentrations were determined against methicillin-susceptible Staphylococcus aureus (ATCC 29213), methicillin-resistant S. aureus (ATCC 33591), vancomycin-intermediate S. aureus (ATCC 700699 MU50), vancomycin-resistant Enterococcus faecium (ATCC 700221), Pseudomonas aeruginosa (ATCC 27853), Salmonella typhimurium (clinical isolate), Klebsiella pneumoniae (clinical isolate), amphotericin-B-resistant C. albicans (ATCC 200955) and Cryptococcus neoformans (clinical isolate).
Results:
The lysine-peptoid hybrids proved to be active against all strains tested, except K. pneumoniae. For each susceptible strain, we identified at least 4 lysine-peptoid hybrids showing excellent activity. The most active compounds displayed minimal inhibitory concentrations ranging from < or =1.6 to 6.25 microM.
Conclusion:
This study demonstrates that lysine-peptoid hybrids show activity against drug-resistant pathogens.
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