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Biochemical and Genetic Characterization of Carbapenem-Hydrolyzing beta-Lactamase OXA-229 from Acinetobacter bereziniae


, : Biochemical and Genetic Characterization of Carbapenem-Hydrolyzing beta-Lactamase OXA-229 from Acinetobacter bereziniae.

Acinetobacter bereziniae (formerly Acinetobacter genomospecies 1) isolate Nec was recovered from a skin sample of a patient hospitalized in Paris, France. It was resistant to penicillins, penicillin-inhibitor combinations, and carbapenems. Cloning and expression in Escherichia coli identified the carbapenem-hydrolyzing class D β-lactamase OXA-229, which is weakly related to other oxacillinases (66% amino acid identity with the closest oxacillinase, OXA-58). It hydrolyzed penicillins, oxacillin, and imipenem but not expanded-spectrum cephalosporins. Sequencing of the genetic context of the blaOXA-229 gene did not identify an insertion sequence but did identify mutations in the promoter sequences in comparison to the fully susceptible A. bereziniae reference strain. The overexpression of blaOXA-229 in A. bereziniae Nec as a source of carbapenem resistance was identified by quantitative real-time PCR.

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