Identification of the outer membrane proteins of Campylobacter pyloridis and antigenic cross-reactivity between C. pyloridis and C. jejuni

J Gen Microbiol. 1987 Jan;133(1):163-70. doi: 10.1099/00221287-133-1-163.


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.

MeSH terms

  • Antigens, Bacterial / analysis*
  • Antigens, Surface / analysis*
  • Bacterial Outer Membrane Proteins / analysis*
  • Bacterial Outer Membrane Proteins / immunology
  • Campylobacter / immunology*
  • Campylobacter fetus / immunology*
  • Cross Reactions
  • Electrophoresis, Polyacrylamide Gel
  • Enzyme-Linked Immunosorbent Assay
  • Flagella / analysis
  • Immunologic Techniques
  • Microscopy, Electron


  • Antigens, Bacterial
  • Antigens, Surface
  • Bacterial Outer Membrane Proteins