Identification of coli surface antigen 23, a novel adhesin of enterotoxigenic Escherichia coli

Felipe Del Canto, Douglas J. Botkin, Patricio Valenzuela, Vsevolod Popov, Fernando Ruiz-Perez, James P. Nataro, Myron M. Levine, O. Colin Stine, Mihai Pop, Alfredo G. Torres, Roberto Vidal

Research output: Contribution to journalArticle

Abstract

Enterotoxigenic Escherichia coli (ETEC) is an important cause of diarrhea, mainly in developing countries. Although there are 25 different ETEC adhesins described in strains affecting humans, between 15% and 50% of the clinical isolates from different geographical regions are negative for these adhesins, suggesting that additional unidentified adhesion determinants might be present. Here, we report the discovery of Coli Surface Antigen 23 (CS23), a novel adhesin expressed by an ETEC serogroup O4 strain (ETEC 1766a), which was negative for the previously known ETEC adhesins, albeit it has the ability to adhere to Caco-2 cells. CS23 is encoded by an 8.8-kb locus which contains 9 open reading frames (ORFs), 7 of them sharing significant identity with genes required for assembly of K88-related fimbriae. This gene locus, named aal (adhesion-associated locus), is required for the adhesion ability of ETEC 1766a and was able to confer this adhesive phenotype to a nonadherent E. coli HB101 strain. The CS23 major structural subunit, AalE, shares limited identity with known pilin proteins, and it is more closely related to the CS13 pilin protein CshE, carried by human ETEC strains. Our data indicate that CS23 is a new member of the diverse adhesin repertoire used by ETEC strains.

Original languageEnglish (US)
Pages (from-to)2791-2801
Number of pages11
JournalInfection and Immunity
Volume80
Issue number8
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Immunology
  • Microbiology
  • Parasitology
  • Infectious Diseases

Cite this

Del Canto, F., Botkin, D. J., Valenzuela, P., Popov, V., Ruiz-Perez, F., Nataro, J. P., ... Vidal, R. (2012). Identification of coli surface antigen 23, a novel adhesin of enterotoxigenic Escherichia coli. Infection and Immunity, 80(8), 2791-2801. https://doi.org/10.1128/IAI.00263-12