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. 1977 May;11(5):785–790. doi: 10.1128/aac.11.5.785

Beta-Lactamases Produced by a Pseudomonas aeruginosa Strain Highly Resistant to Carbenicillin

Roger Labia *, Marlène Guionie 1, Jean-Michel Masson 1, Alain Philippon 1, Michel Barthelemy 1
PMCID: PMC352075  PMID: 406828

Abstract

A Pseudomonas aeruginosa strain isolated at Besançon Hospital, France, proved to be highly resistant to carbenicillin and showed a high hydrolytic activity toward this antibiotic. We clearly demonstrated that two β-lactamases were synthetized: one of them, constitutive, has its enzymatic activity directed mainly toward penicillins, and carbenicillin appears to be its best substrate (higher Vmax); thus, this β-lactamase is a “carbenicillinase” that differs from the well-known “TEM-like” enzymes. The isoelectric point of this carbenicillinase is 5.30 ± 0.03. The other one is an inducible cephalosporinase, very similar to the cephalosporinases usually found in these organisms. Its isoelectric point is 8.66 ± 0.04. These two enzymes have been separated by affinity chromatography and isoelectric focusing. The kinetic constants were measured by computerized microacidimetry.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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