Characterization of the RND-Type Multidrug Efflux Pump MexAB-OprM of the Plant Pathogen Pseudomonas syringae

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Characterization of the RND-type multidrug efflux pump MexAB-OprM of the plant pathogen Pseudomonas syringae.

In gram-negative bacteria, transporters belonging to the RND family are the transporters most relevant for resistance to antimicrobial compounds. In Pseudomonas aeruginosa, a clinically important pathogen, the RND-type pump MexAB-OprM has been recognized as one of the major multidrug efflux systems. Here, homologues of MexAB-OprM in the plant pathogens Pseudomonas syringae pv. phaseolicola 1448...

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nalD encodes a second repressor of the mexAB-oprM multidrug efflux operon of Pseudomonas aeruginosa.

The Pseudomonas aeruginosa nalD gene encodes a TetR family repressor with homology to the SmeT and TtgR repressors of the smeDEF and ttgABC multidrug efflux systems of Stenotrophomonas maltophilia and Pseudomonas putida, respectively. A sequence upstream of mexAB-oprM and overlapping a second promoter for this efflux system was very similar to the SmeT and TtgR operator sequences, and NalD bind...

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The mexR repressor of the mexAB-oprM multidrug efflux operon in Pseudomonas aeruginosa: characterization of mutations compromising activity.

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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Investigation of MexAB-OprM efflux pump gene expression in clinical isolates of pseudomonas aeruginosa isolated from Intensive Care Unit

Background and Aims: Pseudomonas aeruginosa is one of the most important pathogens of nosocomial infections, especially in the ICU (Intensive Care Unit), which has resistance to a wide range of antibiotics, especially Carbapenems. Among the most important resistance mechanisms of this bacteria against carbapenems are MexAB-OprM efflux pump. Therefore, the aim of this study was to evaluate the g...

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Assembly of the MexAB-OprM multidrug pump of Pseudomonas aeruginosa: component interactions defined by the study of pump mutant suppressors.

In an effort to identify key domains of the Pseudomonas aeruginosa MexAB-OprM drug efflux system involved in component interactions, extragenic suppressors of various inactivating mutations in individual pump constituents were isolated and studied. The multidrug hypersusceptibility of P. aeruginosa expressing MexB with a mutation in a region of the protein implicated in oligomerization (G220S) ...

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ژورنال

عنوان ژورنال: Applied and Environmental Microbiology

سال: 2008

ISSN: 0099-2240,1098-5336

DOI: 10.1128/aem.02866-07