title: Influence of mutations in the mexR repressor gene on expression of the MexA-MexB-oprM multidrug efflux system of Pseudomonas aeruginosa.
abstract: 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.
authors.affiliation: Department of Microbiology and Immunology, Queen's University, Kingston, Ontario K7L 3N6, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Srikumar
authors.forename: C J
authors.initials: CJ
authors.lastname: Paul
authors.forename: K
authors.initials: K
authors.lastname: Poole
mesh_terms: D004352:Drug Resistance, Microbial / Q000235:genetics; D018432:Drug Resistance, Multiple / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D016254:Mutagenesis, Insertional; D009154:Mutation; D009876:Operon / Q000235:genetics*; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000235:genetics*; D012045:Regulatory Sequences, Nucleic Acid; D012097:Repressor Proteins / Q000235:genetics / Q000502:physiology
chemical_list: D012097:Repressor Proteins