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 | Zendy

Ramakrishnan Srikumar | Zendy; Eric Tsang | Zendy; Keith Poole | Zendy

Open Access

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

Author(s) -

Ramakrishnan Srikumar,

Eric Tsang,

Keith Poole

Publication year - 1999

Publication title -

journal of antimicrobial chemotherapy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.124

H-Index - 194

eISSN - 1460-2091

pISSN - 0305-7453

DOI - 10.1093/jac/44.4.537

Subject(s) - efflux , pseudomonas aeruginosa , microbiology and biotechnology , penicillin binding proteins , mutant , operon , biology , penicillin , multiple drug resistance , antibiotics , bacteria , biochemistry , genetics , gene

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.

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