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. 1992 Jun;174(12):3874–3883. doi: 10.1128/jb.174.12.3874-3883.1992

Biochemical and antigenic properties of the Campylobacter flagellar hook protein.

M E Power 1, R A Alm 1, T J Trust 1
PMCID: PMC206094  PMID: 1375929

Abstract

The flagellar filament-hook complex was removed from Campylobacter cells by shearing and was purified by differential solubilization and ultracentrifugation at pH 11 followed by cesium chloride buoyant density ultracentrifugation. Flagellar filaments were then dissociated in 0.2 M glycine-HCl (pH 2.2), and purified hooks were collected by ultracentrifugation. The hooks (105 by 24 nm) each displayed a conical protrusion at the proximal end, a concave cavity at the distal end, and helically arranged subunits. The apparent subunit molecular weight of the hook protein of seven of the eight Campylobacter strains studied was 92,500, while that of the other was 94,000. N-terminal amino acid analysis of the hook protein of two strains of Campylobacter coli and one strain of Campylobacter jejuni demonstrated that the first 15 residues were identical. Amino acid composition analysis showed that the Campylobacter hook protein contained 35.7% hydrophobic and 9.5% basic residues. Isoelectric focusing determined that the hook protein was acidic, with a pI of 4.9. Comparisons with the Salmonella and Caulobacter hook protein compositions and N-terminal amino acid sequences indicated that the Campylobacter protein was related, but more distantly than these two proteins were to each other. Immunochemical analysis with four different antisera and a panel of eight strains showed that serospecific epitopes were immunodominant. The Campylobacter hook proteins carried both cross-reactive and specific non-surface-exposed epitopes, as well as serospecific epitopes which were exposed on the surface of the assembled hook. One class of these surface-exposed hook epitopes was shared with serospecific flagellin epitopes and may involve posttranslational modification, while the second class of epitopes was hook specific and not shared with flagellin.

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