title: First characterization of inhibitor-resistant TEM (IRT) beta-lactamases in Klebsiella pneumoniae strains.
abstract: Two clinical strains of Klebsiella pneumoniae, TP 01 and TP 02, presented resistance to amoxicillin-clavulanate and were fully susceptible to cephalothin. These strains produced two beta-lactamases, SHV-1 and a TEM enzyme with a pI of 5.2. The previously described changes Arg-244-->Cys and Arg-244-->Ser in IRT-1 and IRT-2 (A. Belaaouaj, C. Lapoumeroulie, M. M. Caniça, G. Vedel, P. Nevot, R. Krishnamoorthy, and G. Paul, FEMS Microbiol. Lett. 120:75-80, 1994) were found in TEM enzymes from the TP 01 and TP 02 strains, respectively. This is the first report of inhibitor-resistant TEM (IRT) in species other than Escherichia coli from the family Enterobacteriaceae.
authors.affiliation: Laboratoire de Microbiologie, CHR PURPAN, Toulouse, France.
authors.forename: J
authors.initials: J
authors.lastname: Lemozy
authors.forename: D
authors.initials: D
authors.lastname: Sirot
authors.forename: C
authors.initials: C
authors.lastname: Chanal
authors.forename: C
authors.initials: C
authors.lastname: Huc
authors.forename: R
authors.initials: R
authors.lastname: Labia
authors.forename: H
authors.initials: H
authors.lastname: Dabernat
authors.forename: J
authors.initials: J
authors.lastname: Sirot
mesh_terms: D000658:Amoxicillin / Q000494:pharmacology; D019980:Amoxicillin-Potassium Clavulanate Combination; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002511:Cephalosporins / Q000494:pharmacology; D002512:Cephalothin / Q000494:pharmacology; D002969:Clavulanic Acids / Q000494:pharmacology; D004269:DNA, Bacterial / Q000032:analysis; D004352:Drug Resistance, Microbial; D004359:Drug Therapy, Combination / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D007525:Isoelectric Focusing; D007711:Klebsiella pneumoniae / Q000187:drug effects* / Q000201:enzymology* / Q000235:genetics; D008826:Microbial Sensitivity Tests; D016133:Polymerase Chain Reaction; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000737:chemistry / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D002969:Clavulanic Acids; D004269:DNA, Bacterial; D004791:Enzyme Inhibitors; D065093:beta-Lactamase Inhibitors; D019980:Amoxicillin-Potassium Clavulanate Combination; D000658:Amoxicillin; C054882:beta-lactamase PIT-2; D001618:beta-Lactamases; D002512:Cephalothin