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Updated: May 16, 2026

In vitro Investigation of the MexAB Efflux Pump From Pseudomonas aeruginosa
13:40

In vitro Investigation of the MexAB Efflux Pump From Pseudomonas aeruginosa

Published on: February 17, 2014

MexXY multidrug efflux system of Pseudomonas aeruginosa

Yuji Morita1, Junko Tomida, Yoshiaki Kawamura

  • 1Department of Microbiology, School of Pharmacy, Aichi Gakuin University Nagoya, Japan.

Frontiers in Microbiology
|December 13, 2012
PubMed

Insights

The MexXY efflux pump is a key factor in Pseudomonas aeruginosa aminoglycoside resistance, particularly in cystic fibrosis infections. Understanding its properties and related pumps is crucial for combating drug resistance in Gram-negative pathogens.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Pharmacology

Background:

  • Aminoglycosides like amikacin and tobramycin are vital for treating Pseudomonas aeruginosa infections.
  • Increasing aminoglycoside resistance in P. aeruginosa, especially in cystic fibrosis patients, necessitates understanding resistance mechanisms.
  • The MexXY multidrug efflux system is a primary determinant of aminoglycoside resistance in P. aeruginosa.

Purpose of the Study:

  • To comprehensively review the properties of the Pseudomonas aeruginosa MexXY efflux pump.
  • To explore the role of MexXY and other aminoglycoside efflux pumps in Gram-negative pathogens.
  • To highlight the clinical significance and mechanisms of MexXY-mediated aminoglycoside resistance.

Main Methods:

  • Literature review of studies on MexXY and related efflux pumps.
  • Analysis of gene expression, mechanisms, and clinical relevance of efflux systems.
  • Examination of intrinsic aminoglycoside resistance in related bacterial species.

Main Results:

  • MexXY is a major cause of aminoglycoside resistance in P. aeruginosa, often upregulated in cystic fibrosis isolates.
  • Orthologs of MexXY confer intrinsic aminoglycoside resistance in pathogens like Achromobacter xylosoxidans and Burkholderia species.
  • Other significant aminoglycoside efflux pumps include AcrD (E. coli), AmrAB-OprA (B. pseudomallei), and AdeABC (A. baumannii).

Conclusions:

  • The MexXY efflux system is a critical target for overcoming aminoglycoside resistance in P. aeruginosa.
  • Understanding diverse efflux pump systems is essential for developing strategies against multidrug-resistant Gram-negative bacteria.
  • Further research into MexXY inducibility and its outer membrane component (OprA) may reveal new therapeutic avenues.
Keywords:
MexXYOprAPA5471Pseudomonas aeruginosaaminoglycoside resistanceefflux

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