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Infection and Immunity, January 1999, p. 165-172, Vol. 67, No. 1
Department of Veterinary Science, South
Dakota State University, Brookings, South Dakota
57007,1 and
Complex Carbohydrate
Research Center, University of Georgia, Athens, Georgia
306022
Received 18 June 1998/Returned for modification 7 August
1998/Accepted 23 October 1998
In this study, we identified a receptor for the K88ad fimbrial
adhesin of Escherichia coli in neutral glycosphingolipid
preparations from intestinal epithelial cells of K88ad-adhesive pigs,
which was absent in preparations from K88ad-nonadhesive pigs. Neither K88ab nor K88ac adhesin variants bound to this neutral
glycosphingolipid. Because this receptor is an intestinal
glycosphingolipid that binds K88ad adhesin, it has been designated
IGLad. Carbohydrate compositional analysis of a partially purified
preparation of IGLad identified galactose, glucose, and
N-acetylglucosamine in a ratio of 1.5:1.0:0.5 as the major
monosaccharides. Preliminary characterization experiments using lectins
showed that IGLad contains the terminal glycanic structure
Gal
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Identification of an Intestinal Neutral
Glycosphingolipid as a Phenotype-Specific Receptor for the K88ad
Fimbrial Adhesin of Escherichia coli
1-4GlcNAc. Removal of terminal
-linked galactose residues from
IGLad decreased the recognition of IGLad by the K88ad adhesin,
indicating that terminal
-linked galactose is an essential component
of the K88ad adhesin recognition site on IGLad. Studies with purified
glycosphingolipid standards demonstrated that K88ad adhesin binds to
neolactotetraosylceramide (nLc4Cer)
(Gal
1-4GlcNAc
1-3Gal
1-4Glc
1-1Cer), lactotriosylceramide (GlcNAc
1-3Gal
1-4Glc
1-1Cer) and lactotetraosylceramide
(Gal
1-3GlcNAc
1-3Gal
1-4Glc
1-1Cer). Based on these studies,
IGLad appears to be nLc4Cer.
*
Corresponding author. Mailing address: Department of
Veterinary Science, P.O. Box 2175, South Dakota State University,
Brookings, SD 57007-1396. Phone: (605) 688-5171. Fax: (605) 688-6003. E-mail: ericksoa{at}mg.sdstate.edu.
South Dakota Agricultural Experiment Station paper no. 3083.
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