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A differential-display PCR procedure identified the capsular assembly gene kpsD after Escherichia coli type 1 fimbrial binding to mannose-coated Sepharose beads. Limiting-dilution reverse-transcribed PCRs confirmed down-regulation of the kpsD gene, and Northern blot and lacZ fusion analyses showed down-regulation of the kpsFEDUCS region 1 operon. KpsD protein levels fell, and an agglutination test showed less K capsular antigen on the surface following the bacterial ligand-receptor interaction. These data show that binding of type 1 fimbriae (pili) to d-mannose receptors triggers a cross talk that leads to down-regulation of the capsule assembly region 1 operon in uropathogenic E. coli.

infection and immunity

Down-Regulation of the <i>kps</i> Region 1 Capsular Assembly Operon following Attachment of <i>Escherichia coli</i> Type 1 Fimbriae to <scp>d</scp> -Mannose Receptors

Down-Regulation of the kps Region 1 Capsular Assembly Operon following Attachment of Escherichia coli Type 1 Fimbriae to d -Mannose Receptors