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. 1982 Oct;22(4):564–570. doi: 10.1128/aac.22.4.564

Purification and properties of inducible penicillin beta-lactamase isolated from Pseudomonas maltophilia.

Y Saino, F Kobayashi, M Inoue, S Mitsuhashi
PMCID: PMC183794  PMID: 6983856

Abstract

Two types of beta-lactamase were found in the cell-free extract from Pseudomonas maltophilia GN12873. One was an inducible penicillin beta-lactamase, and the other was an inducible cephalosporin beta-lactamase. The purified penicillin beta-lactamase gave a single protein band on polyacrylamide gel electrophoresis. The isoelectric point was 6.9, and the approximate molecular weight was 118,000 by gel filtration and 26,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, suggesting that this enzyme consisted of four subunits. For the hydrolysis of penicillin G, the optimal pH was 8.0 and the optimal temperature was 35 degrees C. The enzyme activity was inhibited by cephamycin derivatives, carpetimycins A and B, iodine, and HgCl2, but not by clavulanic acid. Furthermore, beta-lactamase activity was almost completely inhibited by EDTA but was recovered by the addition of zinc ion. The enzyme showed a unique substrate profile, hydrolyzing N-formimidoyl thienamycin at a significant rate.

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Selected References

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