title: Beta-lactamase activity in ampicillin-resistant Haemophilus influenzae.
abstract: The specific activity, substrate profile, response to inhibitors, inducibility, and cellular localization of the beta-lactamase produced by an ampicillin-resistant strain of Haemophilus influenzae type B were investigated. In these properties the enzyme resembles beta-lactamases produced by other gram-negative bacilli more closely than those produced by gram-positive organisms. It is quite similar to an enzyme found in strains of Klebsiella pneumoniae, and differs significantly from those described in other gram-negative bacilli. Comparison of the substrate profile with the minimal inhibitory concentrations of various beta-lactamase antibiotics suggests that the beta-lactamase plays an important role in the antibiotic resistance of this organism.
authors.forename: W E
authors.initials: WE
authors.lastname: Farrar
authors.forename: N M
authors.initials: NM
authors.lastname: O'Dell
mesh_terms: D000668:Ampicillin Resistance; D006193:Haemophilus influenzae / Q000187:drug effects* / Q000201:enzymology*; D008826:Microbial Sensitivity Tests; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000378:metabolism*
chemical_list: D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases