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The Central, Surface-Exposed Region of the Flagellar Hook Protein FlgE of Campylobacter jejuniShows Hypervariability among Strains

ABSTRACT In a previous study, we observed that monoclonal antibodies raised against the hook protein FlgE of Campylobacter jejuni LIO 36, isolate 5226, bound exclusively to this strain. The aim of this study was to elucidate the molecular basis for these binding specificities. The hook protein-encoding gene flgEof C. jejuni was cloned in Escherichia coli and sequenced. The flgE genes of four additional C. jejuni strains were amplified by PCR and also sequenced. Comparison of the deduced amino acid sequences revealed a high degree of variability in the central parts of the FlgE proteins among the strains, including variable and hypervariable domains. These findings may indicate a selective pressure of C. jejunihosts, forcing the bacteria to generate variations in surface-exposed antigenic determinants.