title: Contribution of multidrug efflux pumps to multiple antibiotic resistance in veterinary clinical isolates of Pseudomonas aeruginosa.
abstract: The contribution of efflux pumps to multidrug resistance in 12 Pseudomonas aeruginosa isolates from various animal sources was assessed. Western immunoblot analyses demonstrated that all twelve isolates expressed significant levels of the MexAB OprM efflux system whereas two isolates simultaneously expressed the MexEF OprN or MexXY systems, respectively. One strain contained a single mutation in mexR, a regulator of mexAB-oprM expression, that did not adversely affect the MexR amino acid sequence, and three isolates contained the same, single base change in the mexA-mexR intergenic region. The MexXY-expressing strain contained two base substitutions in its mexZ regulatory gene which did not alter the MexR sequence.
authors: Department of Microbiology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins 80523, USA.
authors: K L
authors: KL
authors: Beinlich
authors: R
authors: R
authors: Chuanchuen
authors: H P
authors: HP
authors: Schweizer
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D004352:Drug Resistance, Microbial / Q000235:genetics*; D018432:Drug Resistance, Multiple / Q000235:genetics*; D015964:Gene Expression Regulation, Bacterial; D007438:Introns; D026901:Membrane Transport Proteins; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D011552:Pseudomonas Infections / Q000382:microbiology / Q000662:veterinary*; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000235:genetics* / Q000302:isolation & purification; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D026901:Membrane Transport Proteins; C118598:MexA protein, Pseudomonas aeruginosa; C118597:MexB protein, Pseudomonas aeruginosa; C423620:MexR protein, Pseudomonas aeruginosa; C402263:OprM protein, Pseudomonas aeruginosa; C105708:OprN protein, Pseudomonas aeruginosa; D012097:Repressor Proteins