title: Lack of immunoglobulin A1 protease production by Haemophilus ducreyi.
abstract: A collection of 20 strains of Haemophilus ducreyi including freshly isolated, low-passage and multi-passage reference strains was examined for immunoglobulin A1 protease production by SDS-PAGE and immunoblotting. None of the strains demonstrated IgA1 protease activity despite the fact that different culture media were used. By direct immunofluorescence testing, binding of IgA to Haemophilus ducreyi organisms could be demonstrated.
authors.affiliation: Department of Dermatology, University Hospital Eppendorf, Hamburg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Abeck
authors.forename: H C
authors.initials: HC
authors.lastname: Korting
authors.forename: M
authors.initials: M
authors.lastname: Kollmann
authors.forename: A P
authors.initials: AP
authors.lastname: Johnson
authors.forename: R C
authors.initials: RC
authors.lastname: Ballard
authors.forename: H
authors.initials: H
authors.lastname: Mensing
mesh_terms: D015153:Blotting, Western; D006191:Haemophilus ducreyi / Q000201:enzymology*; D006801:Humans; D006868:Hydrolysis; D007070:Immunoglobulin A / Q000737:chemistry*; D010447:Peptide Hydrolases / Q000096:biosynthesis / Q000737:chemistry / Q000172:deficiency*; D012697:Serine Endopeptidases
chemical_list: D007070:Immunoglobulin A; D010447:Peptide Hydrolases; D012697:Serine Endopeptidases; C021433:IgA-specific serine endopeptidase