title: Identification of the outer membrane proteins of Campylobacter pyloridis and antigenic cross-reactivity between C. pyloridis and C. jejuni.
abstract: The outer membrane and surface exposed proteins of four strains of the gastric Campylobacter-like organism Campylobacter pyloridis were identified by SDS-PAGE of Sarkosyl-insoluble membranous material and 125I-surface-labelled whole bacteria. Although constant outer membrane proteins (molecular mass 61, 54 and 31 kDa) were observed in these strains, several variable 125I-labelled surface proteins were detected. C. pyloridis does not appear to express a single surface-exposed major outer membrane protein like that of C. jejuni and C. coli. Putative flagella proteins were identified from isolated flagella and acid-extractable surface material and by immunoblotting with anti-flagella antibodies. Several major protein antigens were observed by immunoblotting with anti-C. pyloridis antisera. At least two of these antigens cross-reacted with anti-C. jejuni antiserum. This cross-reaction appears to be caused primarily by flagellar antigens. However, one major protein antigen (61 kDa) was not cross-reactive with C. jejuni and may, therefore, be useful in serological tests for the specific diagnosis of C. pyloridis infections.
authors.affiliation: Experimental Pathology Laboratory, PHLS Centre for Applied Microbiology and Research, Salisbury, UK.
authors.forename: D G
authors.initials: DG
authors.lastname: Newell
mesh_terms: D000942:Antigens, Bacterial / Q000032:analysis*; D000954:Antigens, Surface / Q000032:analysis*; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis* / Q000276:immunology; D002167:Campylobacter / Q000276:immunology*; D002168:Campylobacter fetus / Q000276:immunology*; D003429:Cross Reactions; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D005407:Flagella / Q000032:analysis; D007158:Immunologic Techniques; D008854:Microscopy, Electron
chemical_list: D000942:Antigens, Bacterial; D000954:Antigens, Surface; D001425:Bacterial Outer Membrane Proteins