title: Lack of immunoglobulin A1 protease production by Branhamella catarrhalis.
abstract: Clinical isolates of Branhamella catarrhalis from the sputum of 20 patients with acute bronchopulmonary infection were examined for synthesis of immunoglobulin A1 protease by immunoelectrophoresis. Ten strains produced beta-lactamase, and 10 were beta-lactamase negative. None of the strains demonstrated immunoglobulin A1 protease activity despite the fact that three different culture media were used.
mesh_terms: D006801:Humans; D009346:Neisseriaceae / Q000201:enzymology* / Q000276:immunology; D010447:Peptide Hydrolases / Q000096:biosynthesis*; D012141:Respiratory Tract Infections / Q000382:microbiology; D012697:Serine Endopeptidases
chemical_list: D010447:Peptide Hydrolases; D012697:Serine Endopeptidases; C021433:IgA-specific serine endopeptidase