BACKGROUND: To screen whether E. coli strains encoding type 1 fimbriae, isolated from fecal microflora, produce bacteriocins more often relative to fimA-negative E. coli strains of similar origin. METHODS: PCR assays were used to detect presence of genes encoding 30 bacteriocin determinants (23 colicin- and 7 microcin-encoding genes) and 18 virulence determinants in 579 E. coli strains of human and animal origin isolated from hospitals and animal facilities in the Czech and Slovak Republic. E. coli strains were also classified into phylogroups (A, B1, B2 and D). RESULTS: fimA-negative E. coli strains (defined as those possessing none of the 18 tested virulence determinants) were compared to fimA-positive E. coli strains (possessing fimA as the only detected virulence determinant). Strains with identified bacteriocin genes were more commonly found among fimA-positive E. coli strains (35.6%) compared to fimA-negative E. coli strains (21.9%, p<0.01) and this was true for both colicin and microcin determinants (p=0.02 and p<0.01, respectively). In addition, an increased number of strains encoding colicin E1 were found among fimA-positive E. coli strains (p<0.01). CONCLUSIONS: fimA-positive E. coli strains produced bacteriocins (colicins and microcins) more often compared to fimA-negative strains of similar origin. Since type 1 fimbriae of E. coli have been shown to mediate adhesion to epithelial host cells and help colonize the intestines, bacteriocin synthesis appears to be an additional feature of colonizing E. coli strains.

2nd Department of Internal Medicine Gastroenterology Charles University in Praha Faculty of Medicine at Hradec Kralové University Teaching Hospital Sokolská 581 Hradec Kralové 500 05 Czech Republic

CEITEC Central European Institute of Technology University of Veterinary and Pharmaceutical Sciences Brno Palackého tř 1 3 612 42 Brno Czech Republic

Department of Biology Faculty of Medicine Masaryk University Kamenice 5 Building A6 625 00 Brno Czech Republic

Department of Clinical Microbiology Faculty Hospital Brno Jihlavská 20 625 00 Brno Czech Republic

Department of Infectious Diseases and Microbiology Faculty of Veterinary Medicine University of Veterinary and Pharmaceutical Sciences Brno Palackého tř 1 3 612 42 Brno Czech Republic

Department of Microbiology Faculty of Medicine Masaryk University and St Anne's University Hospital Pekařská 53 656 91 Brno Czech Republic

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