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Uropathogenic Escherichia coli adhere to uroepithelial cells by their digalactoside alpha-D-galactopyranosyl-(1----4)-beta-D-galactopyranose [alpha-D-Galp-(1----4)-beta-D-Galp or Gal alpha (1----4)Gal]-binding pili, which are composed of repeating identical subunits. The major subunit (PapA) of these pili is not required for binding, but the papF and papG gene products are essential for adhesion. Transcomplementation analysis between the pap gene cluster and a related gene cluster encoding a different binding specificity showed that PapG and not PapF is the Gal alpha (1----4)Gal-specific adhesin. Antibodies against PapG were obtained upon immunizing with whole Pap pili, showing that the adhesin is a pilus component. Antisera specific for different Pap proteins were used to demonstrate that a pilin protein, either PapA or PapE, together with both PapG and PapF, must be exposed on the cell surface to allow E. coli to bind. The DNA sequence of the papG gene is presented, and the deduced primary structure showed similarities both to the B-chain sequence of the digalactoside-binding Shigella toxin and to established amino acid sequences of pilins.

The PapG protein is the alpha-D-galactopyranosyl-(1----4)-beta-D-galactopyranose-binding adhesin of uropathogenic Escherichia coli.