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Hemagglutinating and chemotactic properties of synthetic peptide segments of fimbrial protein from Porphyromonas gingivalis.

Department of Oral Microbiology, Osaka University Faculty of Dentistry, Japan.

ABSTRACT

Porphyromonas gingivalis 381 fimbriae, their synthetic peptide segments, and lipopolysaccharide (LPS) were examined for hemagglutinating and migration-stimulating activities. P. gingivalis 381 fimbriae clearly caused hemagglutination, and several oligopeptide segments such as FP381(61-80), FP381(171-185), and FP381(302-321), corresponding to the amino acid residue numbers based on the amino acid sequence of fimbrillin proposed by Dickinson et al. (D. P. Dickinson, M. A. Kubiniec, F. Yoshimura, and R. J. Genco, J. Bacteriol. 170:1658-1665, 1988), were also demonstrated to agglutinate erythrocytes although less effectively than the native fimbriae. Furthermore, P. gingivalis 381 LPS but not Escherichia coli O55:B5 LPS definitely exhibited hemagglutination. P. gingivalis fimbriae as well as their synthetic peptides possessing hemagglutinating activity enhanced the chemotaxically induced migration of human peripheral blood monocytes. The results of the analyses using synthetic peptide FP381(61-80), its related compounds, and an analog suggested that the amino acid sequence XLTXXLTXXNXX within fimbrial protein molecules may play an important role structurally in the attachment of the protein to host cells such as erythrocytes and monocytes.

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