Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1390586 | Carbohydrate Research | 2010 | 7 Pages |
The detection of carbohydrate–protein interactions is often performed using techniques that require surface immobilization of the lectin or the glycan. A commonly used assay for lectin binding is surface plasmon resonance (SPR). We describe an implementation of the Staudinger ligation as a method to immobilize carbohydrate epitopes to a biosensor surface. This was accomplished by first introducing an azide functionality to a carboxymethyldextran surface, followed by reaction with a phosphane-modified carbohydrate ligand. The chemistry employed is extremely mild and was easily adapted to a commercial biosensor system. Using this approach, we investigated the binding of jacalin and wheat germ agglutinin (WGA) to galactose, lactose, and N-acetyl-lactosamine. We observed that WGA binding shows evidence of multivalent interaction with the surface. Additionally, we found that jacalin binding was influenced by the presence of a flexible and hydrophobic galactosyl aglycone.
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