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. 1986 Nov;168(2):739–745. doi: 10.1128/jb.168.2.739-745.1986

Location of epitopes on Campylobacter jejuni flagella.

S M Logan, T J Trust
PMCID: PMC213544  PMID: 2430943

Abstract

Flagella were isolated from strains of Campylobacter jejuni belonging to different heat-labile serogroups and from a strain of Campylobacter fetus, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that the flagellin molecular weights (Mr) were approximately 62,000. The flagellins were cleaved by hydrolysis with cyanogen bromide, and sodium dodecyl sulfate-urea peptide gel electrophoresis showed that the C. jejuni flagellins were structurally similar, and differed from C. fetus flagellin. Immunochemical analysis by Western blotting, enzyme-linked immunosorbent assay, immune electron microscopy, and immunoprecipitation with polyclonal and monoclonal antibodies revealed the presence of both internal and surface-exposed epitopes. The internal epitopes were antigenically cross-reactive and linear, and in the case of C. jejuni flagellin were located on cyanogen bromide peptides of apparent Mr 22,400 and 11,000. Antigenically cross-reactive epitopes were also present on an Mr 43,000 cyanogen bromide peptide of C. fetus flagellin. The Mr 22,400 peptide of C. jejuni VC74 flagellin also carried closely positioned internal linear epitopes for two monoclonal antibodies. One epitope was strain specific, while the other was shared by some but not all Campylobacter flagellins. The flagella of C. jejuni VC74 also displayed both surface-exposed antigenically cross-reactive and surface-exposed serospecific epitopes. Both linear and conformational epitopes contributed to the serospecificity of C. jejuni VC74 flagella, and a linear serospecific epitope was located on a cyanogen bromide peptide of apparent Mr 4,000.

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