Efflux-mediated multiresistance in Gram-negative bacteria.

Area of Science:

• Microbiology
• Molecular Biology
• Pharmacology

Background:

• Multidrug resistance (MDR) in Gram-negative pathogens like Pseudomonas aeruginosa and Acinetobacter spp. poses a significant clinical challenge.
• Three-component multidrug efflux systems are increasingly recognized as major contributors to both intrinsic and acquired MDR in these bacteria.
• These efflux systems are widespread across Gram-negative organisms, including non-pathogens, and are implicated in resistance to multiple antimicrobials.

Purpose of the Study:

• To highlight the significant role of three-component multidrug efflux systems in Gram-negative pathogen multiresistance.
• To discuss the potential for biocide-mediated selection of MDR via these efflux systems.
• To explore the therapeutic potential of targeting these efflux systems for novel antimicrobial strategies.

Main Methods:

• Review and analysis of existing literature on Gram-negative multidrug efflux systems.
• Examination of genomic data to identify homologues of these efflux systems.
• Discussion of the substrate range and induction mechanisms of these systems.

Main Results:

• Three-component efflux systems are a common determinant of MDR in key Gram-negative pathogens.
• These systems can accommodate a wide range of antimicrobial agents and biocides.
• Biocide use may contribute to the selection and spread of MDR strains.
• Efflux systems are present in both pathogenic and non-pathogenic Gram-negative bacteria.

Conclusions:

• Multidrug efflux systems are critical targets for therapeutic intervention against Gram-negative pathogens.
• Efflux inhibitors may become essential components of future antimicrobial therapies.
• Understanding these systems is crucial for combating the growing threat of antimicrobial resistance.