title: Quantitative studies of the binding of the class II PapG adhesin from uropathogenic Escherichia coli to oligosaccharides.
abstract: Binding of the class II PapG adhesin, found at the tip of filamentous pili on Escherichia coli, to the carbohydrate moiety of globoseries glycolipids in the human kidney is a key step in development of pyelonephritis, a severe form of urinary tract infection. An assay based on surface plasmon resonance for quantification of the binding of the class II PapG adhesin to oligosaccharides has been developed. Using this assay dissociation constants ranging from 80 to 540 microM were determined for binding of the PapG adhesin to di-pentasaccharide fragments from the globoseries of glycolipids. A series of galabiose derivatives, modified at the anomeric position, O-2' or O-3', was also investigated. The anomeric position appeared to be the most promising for development of improved inhibitors of PapG-mediated adhesion of E. coli. p-Methoxyphenyl galabioside was found to be most potent (K(d)=140 microM), and binds to PapG almost as well as the Forssman pentasaccharide.
authors.affiliation: Organic Chemistry, Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
authors.forename: Andreas
authors.initials: A
authors.lastname: Larsson
authors.forename: Jörgen
authors.initials: J
authors.lastname: Ohlsson
authors.forename: Karen W
authors.initials: KW
authors.lastname: Dodson
authors.forename: Scott J
authors.initials: SJ
authors.lastname: Hultgren
authors.forename: Ulf
authors.initials: U
authors.lastname: Nilsson
authors.forename: Jan
authors.initials: J
authors.lastname: Kihlberg
mesh_terms: D018830:Adhesins, Escherichia coli / Q000737:chemistry* / Q000378:metabolism; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001422:Bacterial Adhesion / Q000187:drug effects*; D001665:Binding Sites; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004187:Disaccharides / Q000737:chemistry; D004927:Escherichia coli Infections / Q000382:microbiology; D036781:Fimbriae Proteins / Q000737:chemistry* / Q000378:metabolism; D005577:Forssman Antigen; D005697:Galactosides / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D011956:Receptors, Cell Surface / Q000737:chemistry / Q000378:metabolism; D020349:Surface Plasmon Resonance; D014552:Urinary Tract Infections / Q000382:microbiology
chemical_list: D018830:Adhesins, Escherichia coli; D000900:Anti-Bacterial Agents; D004187:Disaccharides; C402893:Forssman pentasaccharide; D005697:Galactosides; D009844:Oligosaccharides; C092426:PapG protein, E coli; D011956:Receptors, Cell Surface; C032103:4-O-alpha-D-galactopyranosyl-D-galactose; D036781:Fimbriae Proteins; D005577:Forssman Antigen