title: The SfaXII protein from newborn meningitis E. coli is involved in regulation of motility and type 1 fimbriae expression.
abstract: The genomes of pathogenic Escherichia coli may contain several different fimbrial operons. How bacteria regulate and coordinate the choice of fimbrial expression under different circumstances remains largely unanswered. In this report we have investigated the role of the sfaX(II) gene associated to the Sfa(II) fimbrial determinant in the E. coli isolate IHE3034. sfaX(II) belongs to a subfamily of genes, the 17k Da genes, located near different fimbrial operons in uropathogenic and newborn meningitis E. coli (NMEC) strains. Using the NMEC isolate IHE3034 and non-pathogenic E. coli strains we found that the sfaX(II) gene had an inhibitory effect on type 1 fimbriae expression. Down-regulation of type 1 fimbriae was exerted at transcriptional level both by inhibiting expression from the fimA promoter and by reducing the frequency of OFF-to-ON switching. The effect of sfaX(II) on expression of the recombinase FimB that catalyzes OFF-to-ON switching might explain the described reduction in percentage of ON cells. Moreover, expression of the sfaX(II) gene strongly influenced motility and flagella production of the NMEC isolate IHE3034. We propose that the sfaX(II) gene, and presumably other members in the 17 kDa gene family, may play a role in the control of virulence related gene expression in pathogenic E. coli.
authors.affiliation: Department of Molecular Biology and Laboratory for Molecular Infection Medicine Sweden, Umeå University, S-90187 Umeå, Sweden.
authors.forename: Annika E
authors.initials: AE
authors.lastname: Sjöström
authors.forename: Carlos
authors.initials: C
authors.lastname: Balsalobre
authors.forename: Levente
authors.initials: L
authors.lastname: Emödy
authors.forename: Benita
authors.initials: B
authors.lastname: Westerlund-Wikström
authors.forename: Jörg
authors.initials: J
authors.lastname: Hacker
authors.forename: Bernt Eric
authors.initials: BE
authors.lastname: Uhlin
mesh_terms: D015536:Down-Regulation; D004926:Escherichia coli / Q000235:genetics / Q000502:physiology*; D029968:Escherichia coli Proteins / Q000235:genetics* / Q000378:metabolism; D036781:Fimbriae Proteins / Q000235:genetics* / Q000378:metabolism; D005407:Flagella / Q000235:genetics / Q000502:physiology; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D007231:Infant, Newborn; D020814:Meningitis, Escherichia coli / Q000382:microbiology*
chemical_list: D029968:Escherichia coli Proteins; D036781:Fimbriae Proteins