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Antimicrobial Agents and Chemotherapy, February 1998, p. 394-398, Vol. 42, No. 2
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Intrinsic Resistance to Inhibitors of Fatty Acid Biosynthesis in Pseudomonas aeruginosa Is Due to Efflux: Application of a Novel Technique for Generation of Unmarked Chromosomal Mutations for the Study of Efflux Systems

Herbert P. Schweizer*

Department of Microbiology, Colorado State University, Fort Collins, Colorado 80523

Received 2 June 1997/Returned for modification 7 August 1997/Accepted 11 November 1997

Many strains of Pseudomonas aeruginosa are resistant to the antibiotics cerulenin and thiolactomycin, potent inhibitors of bacterial fatty acid biosynthesis. A novel yeast Flp recombinase-based technique was used to isolate an unmarked mexAB-oprM deletion encoding an efflux system mediating resistance to multiple antibiotics in P. aeruginosa. The experiments showed that the MexAB-OprM system is responsible for the intrinsic resistance of this bacterium to cerulenin and thiolactomycin. Whereas thiolactomycin was not a substrate of the MexCD-OprJ pump expressed in a Delta (mexAB-oprM) nfxB mutant, cerulenin was efficiently effluxed by the MexCD-OprJ system. It was also found that the MexAB-OprM system is capable of efflux of irgasan, a broad-spectrum antimicrobial compound used in media selective for Pseudomonas.

* Mailing address: Department of Microbiology, Colorado State University, Fort Collins, CO 80523-1677. Phone: (970) 491-3536. Fax: (970) 491-1815. E-mail: hschweizer{at}vines.colostate.edu.

Antimicrobial Agents and Chemotherapy, February 1998, p. 394-398, Vol. 42, No. 2
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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