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Deletion of the mexAB-oprM multidrug efflux operon substantially compromised the beta-lactam resistance of beta-lactamase-derepressed mutants of Pseudomonas aeruginosa, although it had only a modest impact on resistance of a penicillin-binding protein mutant. This highlights the multifactorial nature of beta-lactam resistance in this organism. Moreover, the contribution of efflux to the net resistance seen in some beta-lactam-resistant mutants suggests that inhibition of MexAB-OprM-mediated drug efflux might be an effective approach to overcoming beta-lactam resistance attributed to efflux as well as to other mechanisms of beta-lactam resistance.

the journal of antimicrobial chemotherapy/journal of antimicrobial chemotherapy

Contribution of the MexAB-OprM multidrug efflux system to the β-lactam resistance of penicillin-binding protein and β-lactamase-derepressed mutants of Pseudomonas aeruginosa