Genetically diverse ceftazidime-resistant isolates from a single center: biochemical and genetic characterization of TEM-10 beta-lactamases encoded by different nucleotide sequences
- 1 September 1993
- journal article
- Published by American Society for Microbiology in Antimicrobial Agents and Chemotherapy
- Vol. 37 (9) , 1989-1992
- https://doi.org/10.1128/aac.37.9.1989
Abstract
Ceftazidime-resistant isolates of Escherichia coli and Klebsiella pneumoniae produced a plasmid-mediated beta-lactamase with a pI of 5.6 with biochemical characteristics comparable to those of the TEM-10 beta-lactamase. Plasmids from the two strains were nonidentical. Both TEM-10 sequences differed from TEM-1 by substitutions of Ser-162 and Lys-237. The nucleotide sequences of the two genes were identical except for three silent nucleotide substitutions corresponding to the nucleotide differences in the Tn2 TEM-1 or Tn3 TEM-1 genes. The original TEM-10 plasmid was identical to that found in the E. coli isolate and coded for a gene that corresponded to the TEM-10 beta-lactamase from Tn2.Keywords
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