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In a previous study, we observed that monoclonal antibodies raised against the hook protein FlgE ofCampylobacter 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 geneflgE ofC. jejuni was cloned inEscherichia coli and sequenced. TheflgE genes of four additionalC. 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 ofC. jejuni hosts, forcing the bacteria to generate variations in surface-exposed antigenic determinants.

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