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Journal of Bacteriology, March 2000, p. 1410-1414, Vol. 182, No. 5
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Influence of Mutations in the mexR Repressor Gene on Expression of the MexA-MexB-OprM Multidrug Efflux System of Pseudomonas aeruginosa

Ramakrishnan Srikumar, Catherine J. Paul, and Keith Poole*

Department of Microbiology and Immunology, Queen's University, Kingston, Ontario K7L 3N6, Canada

Received 18 August 1999/Accepted 30 November 1999

Several nalB-type multidrug-resistant mutants of Pseudomonas aeruginosa overexpressed MexAB-OprM and carried mutations in the local regulatory gene, mexR. Others, dubbed nalC types, carried mutations elsewhere and overexpressed MexAB-OprM less extensively than the nalB strains. Available evidence showed that MexR acted solely as repressor. Disruption of the mexR gene at various places suggested that the 5' end of mexR may be a part of the mexAB-oprM promoter.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Queen's University, Kingston, Ontario K7L 3N6, Canada. Phone: (613) 533-6677. Fax: (613) 533-6796. E-mail: poolek{at}post.queensu.ca.

Journal of Bacteriology, March 2000, p. 1410-1414, Vol. 182, No. 5
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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