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. 1986 Sep;53(3):573–581. doi: 10.1128/iai.53.3.573-581.1986

Cell surface binding site for Clostridium difficile enterotoxin: evidence for a glycoconjugate containing the sequence Gal alpha 1-3Gal beta 1-4GlcNAc.

H C Krivan, G F Clark, D F Smith, T D Wilkins
PMCID: PMC260829  PMID: 3744552

Abstract

This study was undertaken to determine whether a binding site for Clostridium difficile enterotoxin (toxin A) exists in the brush border membranes (BBMs) of the hamster, an animal known to be extremely sensitive to the action of the toxin. Toxin A was the only antigen adsorbed by the BBMs from the culture filtrate of C. difficile. The finding that binding activity could not be destroyed by heat indicated that a carbohydrate moiety might be involved. We therefore examined erythrocytes from various animal species for binding activity since erythrocytes provide a variety of carbohydrate sequences on their cell surfaces. Only rabbit erythrocytes bound the toxin, and the cells agglutinated. A binding assay based on an enzyme-linked immunosorbent assay method for quantifying C. difficile toxin A was used to compare binding of the toxin to hamster BBMs, rabbit erythrocytes, and BBMs from rats, which are less susceptible to the action of C. difficile toxin A than hamsters. Results of this comparison indicated the following order of toxin-binding frequency: rabbit erythrocytes greater than hamster BBMs greater than rat BBMs. Binding of toxin A to hamster BBMs at 37 degrees C was comparable to what has been observed with cholera toxin, but binding was enhanced at 4 degrees C. A similar binding phenomenon was observed with rabbit erythrocytes. Examination of the cell surfaces of hamster BBMs and rabbit erythrocytes with lectins and specific glycosidases revealed a high concentration of terminal alpha-linked galactose. Treatment of both membrane types with alpha-galactosidase destroyed the binding activity. The glycoprotein, calf thyroglobulin, also bound the toxin and inhibited toxin binding to cells. Toxin A did not bind to human erythrocytes from blood group A, B, or O donors. However, after fucosidase treatment of human erythrocytes, only blood group B erythrocytes, which possess the blood group B structure Gal alpha 1-3[Fuc alpha 1-2]Gal beta 1-4GlcNAc-R, bound the toxin. This indicated that toxin A was likely binding to Gal alpha 1-3Gal beta 1-4GlcNAc, a carbohydrate sequence also found on calf thyroglobulin and rabbit erythrocytes. All of the results indicate that hamster BBMs contain a carbohydrate-binding site for toxin A that has at least a Gal alpha 1-3Gal beta 1-4GlcNAc nonreducing terminal sequence.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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