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Journal of Experimental Medicine, Vol 178, 2115-2121, Copyright © 1993 by Rockefeller University Press
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B Nowicki, A Hart, KE Coyne, DM Lublin and S Nowicki
Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston 77550.
A bacterial pathogen that is important in both urinary tract and intestinal infections is Escherichia coli which expresses Dr or related adhesins. In this report, we present a model for testing cell-cell interaction, using both molecularly characterized laboratory cells that express recombinant molecules of human decay-accelerating factor (DAF), and recombinant bacterial Dr colonization factors. Dr adhesin ligand was identified as DAF (CD55), a membrane protein that protects autologous tissues from damage due to the complement system. Structure- function studies mapped the adhesin-binding site on the DAF molecule. A single-point substitution in the third short consensus repeat domain, Ser165 to Leu, corresponding to the Dra to Drb allelic polymorphism, caused complete abolition of adhesin binding to DAF.
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