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The association of thepap operon with the CS31A and F17 adhesins was studied with 255Escherichia coli strains isolated from calves, lambs, or humans with diarrhea. The three classes of PapG adhesin with different receptor binding preferences were also screened. Thepap operon was associated with 50 and 36% of human strains that produced CS31A and ovine strains that produced F17, respectively. Among the bovine isolates, thepap operon was detected in 61% of the CS31A-positive isolates and 72% of the strains that produce both CS31A and F17. The class II adhesin gene was present in bovine (20%) and ovine (71%) isolates. Both class II and III adhesins were genetically associated with 36% of the human strains. The highest prevalence of thepap operon was observed amongE. coli strains that produce additional adhesins involved in the binding of bacteria to intestinal cells. Among the bovine isolates, the reference strain for CS31A and F17c was found to be positive for thepap operon. Phenotypic and genotypic characterizations were undertaken. Pap31A appeared as fine and flexible fimbriae surrounding the bacteria but did not mediate adhesion to calf intestinal villi. Pap31A production was optimal with bacteria cultured on minimal growth media and repressed by addition of exogenous leucine. The deduced amino acid sequence of the PapA31A structural subunit showed 57 to 97% identity with the different P-related structural subunits produced byE. coli strains isolated from pigs with septicemia or humans with urinary tract infections. None of the threepapG allelic variants was detected, but a homologouspapG gene was present in the chromosome of strain 31A.

journal of clinical microbiology

Epidemiological Study of pap Genes among Diarrheagenic or Septicemic Escherichia coli Strains Producing CS31A and F17 Adhesins and Characterization of Pap 31A Fimbriae