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. 1994 Jun;62(6):2633–2638. doi: 10.1128/iai.62.6.2633-2638.1994

F17-like fimbriae from an invasive Escherichia coli strain producing cytotoxic necrotizing factor type 2 toxin.

K el Mazouari 1, E Oswald 1, J P Hernalsteens 1, P Lintermans 1, H De Greve 1
PMCID: PMC186558  PMID: 7910597

Abstract

The F17b fimbriae encoded by the transmissible virulence plasmid Vir, also coding for cytotoxic necrotizing factor type 2, were characterized. A 5.7-kb region of Vir mediates in vitro N-acetylglucosamine-sensitive adhesion to calf intestinal villi. Sequence analysis revealed that this region codes for a structural subunit and an adhesin closely related to the F17-A and F17-G proteins encoded by the F17 fimbrial gene cluster. The F17b-A gene presents an open reading frame of 540 bp encoding a polypeptide of 180 amino acids with a putative signal peptide of 21 residues. The mature protein shows an identity of 74% with the F17-A structural subunit. This 20-kDa protein is recognized by antiserum directed against F17 fimbriae. The F17b-G gene shows an open reading frame of 1,029 bp encoding a polypeptide of 343 amino acids with a putative signal peptide of 22 residues. The F17b-G polypeptide exhibits 95% identity with the F17-G adhesin. The functional homology of the gene products was further confirmed by demonstrating that mutants in the F17-A gene can be complemented by the F17b-A gene and vice versa. These results prove that fimbriae belonging to the F17 family are also found on pathogenic Escherichia coli strains other than enterotoxigenic isolates producing heat-labile or heat-stable enterotoxin.

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Selected References

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