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Antimicrob. Agents Chemother., Nov 1997, 2540-2543, Vol 41, No. 11
T Kohler, M Michea-Hamzehpour, P Plesiat, AL Kahr and JC Pechere
Resistance mechanisms selected after in vitro exposure to 12 quinolones
were analyzed for Pseudomonas aeruginosa. Efflux-type mutants were
predominant. Quinolones differed in their ability to select a particular
efflux system. While the newer fluoroquinolones favored the MexCD-OprJ
system, the older quinolones selected exclusively the MexEF- OprN or
MexAB-OprM systems. A protonable C-7 substituent in combination with a C-6
fluorine atom is a structural determinant of quinolones involved in efflux
pump substrate specificity.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Differential selection of multidrug efflux systems by quinolones in Pseudomonas aeruginosa
Department of Genetics and Microbiology, Centre Medical Universitaire, Geneva, Switzerland. Thilo.Kohler@medecine.unige.ch
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