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OXA-60, a chromosomal, inducible, and imipenem-hydrolyzing class D beta-lactamase from Ralstonia pickettii.

ABSTRACT: A chromosomally encoded oxacillinase, OXA-22, had been characterized from Ralstonia pickettii PIC-1 that did not explain by itself the resistance profile of this strain to beta-lactams. Thus, further analysis of the genetic background of this species led to the identification of another oxacillinase, OXA-60, that was expressed only after beta-lactam induction. This chromosomally encoded oxacillinase shared 19% amino acid identity with OXA-22. It has a narrow-spectrum hydrolysis profile that includes imipenem. OXA-60-like enzymes were identified in several R. pickettii strains. Gene inactivation and induction studies of the bla(OXA-60) and bla(OXA-22) genes in R. pickettii identified the relative contribution of each oxacillinase to the resistance profile of R. pickettii to beta-lactams.

SUBMITTER: Girlich D

PROVIDER: S-EPMC525441 | biostudies-literature | 2004 Nov

REPOSITORIES: biostudies-literature

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OXA-60, a chromosomal, inducible, and imipenem-hydrolyzing class D beta-lactamase from Ralstonia pickettii.

Girlich Delphine D Naas Thierry T Nordmann Patrice P

Antimicrobial agents and chemotherapy 20041101 11

A chromosomally encoded oxacillinase, OXA-22, had been characterized from Ralstonia pickettii PIC-1 that did not explain by itself the resistance profile of this strain to beta-lactams. Thus, further analysis of the genetic background of this species led to the identification of another oxacillinase, OXA-60, that was expressed only after beta-lactam induction. This chromosomally encoded oxacillinase shared 19% amino acid identity with OXA-22. It has a narrow-spectrum hydrolysis profile that incl ...[more]

PMID: 15504844

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Biochemical-genetic characterization and distribution of OXA-22, a chromosomal and inducible class D beta-lactamase from Ralstonia (Pseudomonas) pickettii.

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