نتایج جستجو برای: oprm
تعداد نتایج: 308 فیلتر نتایج به سال:
Retrospective analysis of 189 nonredundant strains of Pseudomonas aeruginosa sequentially recovered from the sputum samples of 46 cystic fibrosis (CF) patients over a 10-year period (1998 to 2007) revealed that 53 out of 189 (28%) samples were hypersusceptible to the beta-lactam antibiotic ticarcillin (MIC < or = 4 microg/ml) (phenotype dubbed Tic(hs)). As evidenced by trans-complementation and...
MexXY-OprM Efflux Pump Is Necessary for Adaptive Resistance of Pseudomonas aeruginosa to Aminoglycosides Didier Hocquet, Christelle Vogne, Farid El Garch, Anne Vejux, Naomasa Gotoh, Angela Lee, Olga Lomovskaya, and Patrick Plésiat* Laboratoire de Bactériologie, Hôpital Jean Minjoz, Besançon, France; Department of Microbiology, Kyoto Pharmaceutical University, Kyoto, Japan; and Essential Therape...
The use of radiopharmaceuticals for the diagnosis of infection is increasing due to their ability to distinguish between septic and aseptic inflammation. The aim of this study was to analyze the intracellular accumulation of technetium-99m-ciprofloxacin in strains of Staphylococcus aureus and Pseudomonas aeruginosa harboring an overexpression of NorA and MexAB-OprM, respectively.
BACKGROUND Small colony variants (SCVs) are slow-growing bacteria, which often show increased resistance to antibiotics and cause latent or recurrent infections. It is therefore important to understand the mechanisms at the basis of this phenotypic switch. METHODOLOGY/PRINCIPAL FINDINGS One SCV (termed PAO-SCV) was isolated, showing high resistance to gentamicin and to the cephalosporine cefo...
OBJECTIVES The objectives of this study were to compare the antibiotic susceptibility of Pseudomonas aeruginosa strains with increased efflux pump expression in vitro and in vivo and to use these same strains to evaluate the efficacy of combinations of antibiotics with putative efflux pump inhibitors in vivo. METHODS A collection of P. aeruginosa strains that overexpress three efflux pumps (M...
Clinical strains of Stenotrophomonas maltophilia are often highly resistant to multiple antibiotics, although the mechanisms of resistance are generally poorly understood. Multidrug resistant (MDR) strains were readily selected by plating a sensitive reference strain of the organism individually onto a variety of antibiotics, including tetracycline, chloramphenicol, ciprofloxacin, and norfloxac...
Pseudomonas aeruginosa is equipped with the Sec and Tat protein secretion systems, which translocate the xenobiotic transporter MexAB-OprM and the pathogenic factor phospholipase C (PlcH), respectively. When the signal sequence of MexA was replaced with that of PlcH, the hybrid protein was successfully expressed and recovered from the periplasmic fraction, suggesting that the hybrid protein had...
BACKGROUND Macrolides show high minimum inhibitory concentrations (MICs) against Pseudomonas aeruginosa when tested in recommended media (cation-adjusted Muller-Hinton broth [CA-MHB]). Nevertheless, azithromycin is successfully used in cystic fibrosis patients, supposedly because of "nonantibiotic effects." METHODS CA-MHB and Roswell Park Memorial Institute (RPMI) 1640 medium (used for growin...
Mutations in mexR yield a multidrug resistance phenotype in nalB mutants of Pseudomonas aeruginosa as a result of derepression of the mexAB-oprM multidrug efflux operon. MexR produced by several nalB strains carried single amino acid changes that compromised MexR stability or its ability to dimerize. Changes at residues L95 and R21, however, produced a stable MexR protein capable of dimerizatio...
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