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J. Bacteriol., 09 1997, 5643-5647, Vol 179, No. 17
Copyright © 1997, American Society for Microbiology

A flagellar sheath protein of Helicobacter pylori is identical to HpaA, a putative N-acetylneuraminyllactose-binding hemagglutinin, but is not an adhesin for AGS cells

AC Jones, RP Logan, S Foynes, A Cockayne, BW Wren and CW Penn
School of Biological Sciences, University of Birmingham, United Kingdom.

The gene encoding a 29-kDa flagellar sheath protein was cloned and found to be similar to hpaA, reported to encode an N- acetylneuraminyllactose-binding fibrillar hemagglutinin (D. G. Evans, T. K. Karjalainen, D. J. Evans, Jr., D. Y. Graham, and C. H. Lee, J. Bacteriol. 175:674-683, 1993). The transcriptional start was mapped by primer extension from Helicobacter pylori mRNA, indicating an active consensus promoter at a location different from that suggested by Evans et al. Immunogold labelling of the flagellar sheath with a monoclonal antibody to HpaA was demonstrated in four strains, contrary to previous reports of a surface (D. G. Evans, T. K. Karjalainen, D. J. Evans, Jr., D. Y. Graham, and C. H. Lee, J. Bacteriol. 175:674-683, 1993) or a cytoplasmic (P. W. O'Toole, L. Janzon, P. Doig, J. Huang, M. Kostrzynska, and T. J. Trust, J. Bacteriol. 177:6049-6057, 1995) locale. Agglutination of erythrocytes and adherence to AGS cells by a delta hpaA mutant were no different from those of the parent strain, confirming a recent finding of O'Toole et al.


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