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J Clin Microbiol. 1985 January; 21(1): 108-112

Antigenic analysis of Campylobacter flagellar protein and other proteins.

ABSTRACT

Outer membrane proteins of Campylobacter jejuni and other campylobacter species were analyzed for their antigenic potentials by immunoblotting. Polypeptides were resolved by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, transferred electrophoretically, and reacted with rabbit antisera to C. jejuni. Each Campylobacter species analyzed demonstrated a unique outer membrane protein antigenic profile; interspecies antigen sharing was observed to be compatible with the degree of DNA relatedness between the species. The most highly conserved outer membrane protein antigen was the flagellum (molecular weight, 62,000). An aflagellate mutant was found to be untypable with the heat-labile system, in contrast to its parental isolate. The immunogenic potentials of C. jejuni proteins were examined by immunoblot analysis of sera from infected humans. Sera of convalescent patients, reacted with their homologous C. jejuni isolates, recognized a variety of campylobacter proteins. The most consistent immunogen in human infection was the flagellar protein. Patient sera assayed by the immunoblot technique were easily distinguished from control sera, which did not recognize specific campylobacter antigens. These findings suggest that the campylobacter flagellar protein is an essential determinant of the heat-labile antigen typing scheme and is the dominant immunogen recognized during C. jejuni infections in humans.

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