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. 1993 May;37(5):962–969. doi: 10.1128/aac.37.5.962

Characterization of a novel extended-spectrum beta-lactamase from Pseudomonas aeruginosa.

P Nordmann 1, E Ronco 1, T Naas 1, C Duport 1, Y Michel-Briand 1, R Labia 1
PMCID: PMC187863  PMID: 8517722

Abstract

A clinical isolate of Pseudomonas aeruginosa RNL-1 showed resistance to extended-spectrum cephalosporins which was inhibited by clavulanic acid. Although this strain contained three plasmids ca. 80, 20, and 4 kb long, the resistance could not be transferred by mating-out assays with P. aeruginosa or Escherichia coli. Cloning of a 2.1-kb Sau3A fragment from P. aeruginosa RNL-1 into plasmid pACYC184 produced pPZ1, a recombinant plasmid that encodes a beta-lactamase. This beta-lactamase (PER-1) had a relative molecular mass of 29 kDa and a pI of 5.4 and was biosynthesized by P. aeruginosa RNL-1 along with a likely cephalosporinase with a pI of 8.7. PER-1 showed a broad substrate profile by hydrolyzing benzylpenicillin, amoxicillin, ticarcillin cephalothin, cefoperazone, cefuroxime, HR 221, ceftriaxone, ceftazidime, and (moderately) aztreonam but not oxacillin, imipenem, or cephamycins. Vmax values for extended-spectrum cephalosporins were uncommonly high, and the affinity of the enzyme for most compounds was relatively low (i.e., high Km). PER-1 activity was inhibited by clavulanic acid, sulbactam, imipenem, and cephamycins but not by EDTA. A 1.1-kb SnaBI fragment from pPZ1 failed to hybridize with plasmids that encode TEM-, SHV-, OXA-, or CARB/PSE-type beta-lactamase or with the ampC gene of P. aeruginosa. However, the same probe appeared to hybridize with chromosomal but not plasmid DNA from P. aeruginosa RNL-1. This study reports the properties of a novel extended-spectrum beta-lactamase in P. aeruginosa which may not be derived by point mutations from previously known enzymes of this species.

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Selected References

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