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. 1985 May;27(5):715–719. doi: 10.1128/aac.27.5.715

Five novel plasmid-determined beta-lactamases.

A A Medeiros, M Cohenford, G A Jacoby
PMCID: PMC180139  PMID: 3925874

Abstract

Five novel plasmid-determined beta-lactamases named TLE-1, OXA-4, OXA-5, OXA-6, and OXA-7 were detected in ampicillin-resistant isolates of Escherichia coli and carbenicillin-resistant strains of Pseudomonas aeruginosa. TLE-1 resembled TEM-1 in substrate profile and reactions with inhibitors but differed in isoelectric point (5.55) and enzyme banding pattern on flat-bed electrofocusing.OXA-4, OXA-5, OXA-6, and OXA-7 hydrolyzed oxacillin, methicillin, and cloxacillin readily but differed from OXA-1, OXA-2, and OXA-3 in substrate profiles, inhibitor reactions, and isoelectric points (7.5 to 7.8).OXA-4 and OXA-6 were unusual for members of the OXA group in their sensitivity to inhibition by cloxacillin. OXA-5 and OXA-7 had isoelectric points close to that of SHV-1, emphasizing the need in beta-lactamase classification for studies in addition to isoelectric focusing. These five new enzymes bring the number of plasmid-determined beta-lactamases known in gram-negative organisms to more than 20. The evolution of such enzymatic diversity remains to be explored.

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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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