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

Infection and Immunity
H C KrivanT D Wilkins

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, b...Continue Reading

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