title: Ceftazidime and aztreonam resistance in Providencia stuartii: characterization of a natural TEM-derived extended-spectrum beta-lactamase, TEM-60.
abstract: A plasmid-encoded beta-lactamase produced from a clinical strain of Providencia stuartii has been purified and characterized. The gene coding for the beta-lactamase was cloned and sequenced. It appears to be a new natural TEM-derived enzyme, named TEM-60. Point mutations (Q39K, L51P, E104K, and R164S) are present with respect to the TEM-1 enzyme; the mutation L51P has never been previously reported, with the exception of the chromosomally encoded extended-spectrum beta-lactamase PER-1. Kinetic parameters relative to penicillins, cephalosporins, and monobactams other than mechanism-based inactivators were related to the in vitro susceptibility phenotype.
authors.affiliation: Dipartimento di Scienze e Tecnologie Biomediche, Università degli Studi dell'Aquila, Italy.
authors.forename: N
authors.initials: N
authors.lastname: Franceschini
authors.forename: M
authors.initials: M
authors.lastname: Perilli
authors.forename: B
authors.initials: B
authors.lastname: Segatore
authors.forename: D
authors.initials: D
authors.lastname: Setacci
authors.forename: G
authors.initials: G
authors.lastname: Amicosante
authors.forename: A
authors.initials: A
authors.lastname: Mazzariol
authors.forename: G
authors.initials: G
authors.lastname: Cornaglia
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001398:Aztreonam / Q000494:pharmacology; D002442:Ceftazidime / Q000494:pharmacology*; D002511:Cephalosporins / Q000494:pharmacology*; D019818:Clavulanic Acid / Q000494:pharmacology; D004347:Drug Interactions; D018432:Drug Resistance, Multiple; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007525:Isoelectric Focusing; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D008997:Monobactams / Q000494:pharmacology; D010397:Penicillanic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D011532:Providencia / Q000187:drug effects* / Q000201:enzymology; D013407:Sulbactam / Q000494:pharmacology; D000078142:Tazobactam; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000235:genetics / Q000302:isolation & purification*
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D004791:Enzyme Inhibitors; D008997:Monobactams; D065093:beta-Lactamase Inhibitors; D019818:Clavulanic Acid; D010397:Penicillanic Acid; D002442:Ceftazidime; D001618:beta-Lactamases; D001398:Aztreonam; D013407:Sulbactam; D000078142:Tazobactam