Summary
The three antigenic variants of the K88 fimbrial adhesin (K88ab, K88ac, and K88ad) of enterotoxigenic Escherichia coli (ETEC) each exhibit unique specificity with regard to their hemagglutination characteristics. The variants are also unique in the specificity of their binding to the brush borders of enterocytes isolated from pigs with different genetic backgrounds. Diversity in enterocyte binding specificity suggests the existence of several K88 receptors, expressed individually or in various combinations on porcine enterocytes. Three candidate receptors have been identified that may explain the adhesion of K88 fimbrial variants to various porcine enterocytes. These receptors are an intestinal mucin-type sialoglycoprotein (IMTGP), an intestinal transferrin (GP74), and an intestinal neutral glycosphingolipid (IGLad).The IMTGP binds K88ab and K88ac, but not K88ad. The GP74 binds K88ab, but not K88ac or K88ad, and the IGLad binds K88ad, but not K88ab or K88ac. Each of the candidate receptors has been found in brush borders that are adhesive for the fimbriae that bind the respective receptor. They have not been found in brush borders that are not adhesive for those same fimbriae. The presence of IMTGP was highly correlated with susceptibility of neonatal gnotobiotic pigs to ETEC expressing K88ab or K88ac.
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Francis, D.H., Erickson, A.K., Grange, P.A. (1999). K88 Adhesins of Enterotoxigenic Escherichia Coli and their Porcine Enterocyte Receptors. In: Paul, P.S., Francis, D.H. (eds) Mechanisms in the Pathogenesis of Enteric Diseases 2. Advances in Experimental Medicine and Biology, vol 473. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4143-1_13
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