Toxic Electrophiles Induce Expression of the Multidrug Efflux Pump MexEF-OprN in Pseudomonas aeruginosa through a Novel Transcriptional Regulator, CmrA.

Antimicrobial Agents and Chemotherapy
Paulo JuarezCatherine Llanes

Abstract

The multidrug efflux system MexEF-OprN is produced at low levels in wild-type strains of Pseudomonas aeruginosa However, in so-called nfxC mutants, mutational alteration of the gene mexS results in constitutive overexpression of the pump, along with increased resistance of the bacterium to chloramphenicol, fluoroquinolones, and trimethoprim. In this study, analysis of in vitro-selected chloramphenicol-resistant clones of strain PA14 led to the identification of a new class of MexEF-OprN-overproducing mutants (called nfxC2) exhibiting alterations in an as-yet-uncharacterized gene, PA14_38040 (homolog of PA2047 in strain PAO1). This gene is predicted to encode an AraC-like transcriptional regulator and was called cmrA (for chloramphenicol resistance activator). In nfxC2 mutants, the mutated CmrA increases its proper gene expression and upregulates the operon mexEF-oprN through MexS and MexT, resulting in a multidrug resistance phenotype without significant loss in bacterial virulence. Transcriptomic experiments demonstrated that CmrA positively regulates a small set of 11 genes, including PA14_38020 (homolog of PA2048), which is required for the MexS/T-dependent activation of mexEF-oprN PA2048 codes for a protein sharing conserve...Continue Reading

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Citations

Dec 31, 2019·Journal of the Pediatric Infectious Diseases Society·John M MorrisonDavid M Berman
Jul 31, 2019·Journal of Bacteriology·Ian T HillSimon L Dove
Aug 7, 2019·Antimicrobial Agents and Chemotherapy·Alexandre TetardCatherine Llanes
Jul 5, 2018·Frontiers in Molecular Biosciences·Karim Housseini B IssaIsabelle Broutin
Apr 24, 2018·Frontiers in Microbiology·Carla López-CausapéAntonio Oliver
Mar 7, 2021·Applied and Environmental Microbiology·Hadiastri KusumawardhaniJohannes H de Winde
Jun 3, 2021·International Journal of Molecular Sciences·Karolina KoteckaAneta Agnieszka Bartosik

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