Role of the Ser-287-Asn Replacement in the Hydrolysis Spectrum Extension of AmpC β-Lactamases in Escherichia coli

Role of the Ser-287-Asn Replacement in the Hydrolysis Spectrum Extension of AmpC β-Lactamases in Escherichia coli Occurrence of ST23 Complex Phylogroup A Escherichia coli Isolates Producing Extended-Spectrum AmpC β-Lactamase in a French Hospital New Variant of CTX-M-Type Extended-Spectrum β-Lactamases, CTX-M-71, with a Gly238Cys Substitution in a K lebsiella pneumoniae Isolate from Bulgaria Extended-Spectrum Cephalosporinase in Acinetobacter baumannii Extended-Spectrum Cephalosporinases in Pseudomonas aeruginosa E240V Substitution Increases Catalytic Efficiency toward Ceftazidime in a New Natural TEM-Type Extended-Spectrum β-Lactamase, TEM-149, from Enterobacter aerogenes and Serratia marcescens Clinical Isolates BEL-2, an Extended-Spectrum β-Lactamase with Increased Activity toward Expanded-Spectrum Cephalosporins in Pseudomonas aeruginosa Substrate Selectivity and a Novel Role in Inhibitor Discrimination by Residue 237 in the KPC-2 β-Lactamase Roles of Residues Cys69, Asn104, Phe160, Gly232, Ser237, and Asp240 in Extended-Spectrum β-Lactamase Toho-1 Biochemical Characterization of Metallo-β-Lactamase VIM-11 from a Pseudomonas aeruginosa Clinical Strain