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Infect. Immun., Jul 1996, 2415-2419, Vol 64, No. 7
Copyright © 1996, American Society for Microbiology

Differential effects of the streptococcal fibronectin-binding protein, FBP54, on adhesion of group A streptococci to human buccal cells and HEp-2 tissue culture cells

HS Courtney, JB Dale and DI Hasty
Veterans Affairs Medical Center, Memphis, Tennessee 38104, USA.

We have previously demonstrated that fibronectin mediates streptococcal adhesion to host cells and that streptococci interact primarily with the N-terminal domain of fibronectin. FBP54 is a 54-kDa protein from group A streptococci that binds fibronectin. In this report, we show that the N-terminal domain of fibronectin reacts with FBP54 and preferentially blocks streptococcal adhesion to buccal epithelial cells. FBP54 blocked adhesion to human buccal epithelial cells by 80% in a dose-related fashion. In contrast, FBP54 had little effect on adhesion of group A streptococci to HEp-2 tissue culture cells. The fibronectin-binding domain of FBP54 has been localized to the first 89 N-terminal residues of the protein. Experiments using affinity-purified antibodies to this region indicated that the N terminus of FBP54 is exposed on the surface of streptococci in a manner that can interact with immobilized receptors. Analysis of sera from patients with post- streptococcal glomerulonephritis and acute rheumatic fever indicated that FBP54 is expressed in vivo and is immunogenic in the human host. These data indicate that FBP54 is a streptococcal adhesin that is expressed in the human host and that preferentially mediates adhesion to certain types of human cells.

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