6533b7d2fe1ef96bd125f68e

RESEARCH PRODUCT

Constitutive activation of MexT by amino acid substitutions results in MexEF-OprN overproduction in clinical isolates of Pseudomonas aeruginosa

Patrick PlésiatCatherine LlanesChristophe BordiIsabelle BroutinPaulo Juarez

subject

0301 basic medicine030106 microbiologyMicrobial Sensitivity Tests[ SDV.MP.BAC ] Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriologymedicine.disease_causeMicrobiology03 medical and health sciencesAntibiotic resistanceDownregulation and upregulationMechanisms of Resistance[ SDV.MP ] Life Sciences [q-bio]/Microbiology and ParasitologyDrug Resistance BacterialmedicinePharmacology (medical)OverproductionComputingMilieux_MISCELLANEOUSRegulator genePharmacologychemistry.chemical_classificationChemistryPseudomonas aeruginosaChloramphenicolGene Expression Regulation Bacterial[SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology3. Good healthAmino acidAnti-Bacterial AgentsInfectious Diseases[SDV.MP]Life Sciences [q-bio]/Microbiology and ParasitologyAmino Acid SubstitutionMutationPseudomonas aeruginosaEffluxmedicine.drug

description

ABSTRACT When overproduced, the multidrug efflux system MexEF-OprN increases the resistance of Pseudomonas aeruginosa to fluoroquinolones, chloramphenicol, and trimethoprim. In this work, we demonstrate that gain-of-function mutations in the regulatory gene mexT result in oligomerization of the LysR regulator MexT, constitutive upregulation of the efflux pump, and increased resistance in clinical isolates.

https://hal-amu.archives-ouvertes.fr/hal-01770232