Nucleotide sequence and characterization of a carbenicillin-hydrolyzing penicillinase gene from Proteus mirabilis
- PMID: 1840585
- PMCID: PMC209063
- DOI: 10.1128/jb.173.21.7038-7041.1991
Nucleotide sequence and characterization of a carbenicillin-hydrolyzing penicillinase gene from Proteus mirabilis
Abstract
The structural gene of a carbenicillinase was cloned from the chromosomal DNA of Proteus mirabilis GN79. This gene codes for a protein of 270 amino acids. Alignment of the amino acid sequence with those of known beta-lactamases revealed that the enzyme is a novel class A beta-lactamase with a unique conserved triad, RTG. By using a DNA fragment of the structural gene, a lack of cross hybridization was confirmed between the DNA probe and total DNAs from natural isolates of P. mirabilis, suggesting that the carbenicillinase may not be a species-specific beta-lactamase of P. mirabilis.
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