Wisteria floribunda lectin (WFA, WFL), Agarose bound

The binding specificity of Wisteria floribunda lectin (WFL) is not completely clear but this lectin appears to preferentially bind carbohydrate structures terminating in N-acetylgalactosamine linked α or β to the 3 or 6 position of galactose. This lectin has been used to fractionate lymphocyte populations, and although not mitogenic, elicits the production of lymphokines from murine splenocytes. Agarose bound* WFL is prepared using our affinity-purified lectins. Heat stable, cross-linked 4% agarose beads with a molecular weight exclusion limit of about 2x107 daltons are used as the solid-phase matrix to which the lectins are covalently coupled. The attachment of the lectins to the beads is carefully controlled to preserve lectin activity and minimize conformational changes of the bound lectins that might result in nonspecific ionic or hydrophobic interactions. The technique we have developed to couple lectins to agarose beads inserts a hydrophilic spacer arm between the lectin and the matrix. This coupling method provides several advantages over the traditional cyanogen bromide procedure: Maximum carbohydrate binding activity of the coupled lectins is retained. Linkage is stable over a range of pH values. Conjugated proteins are not leached off the beads by Tris or other routinely used buffers. No residual charges are present after conjugation. This minimizes non-specific binding to the matrix. Our agarose bound lectins are supplied at a constant concentration of lectin per ml of settled beads. The concentration for each lectin is selected to achieve the highest glycoconjugate binding capacity per mg of lectin present in the beads. Each lot is tested for its binding capacity using glycoproteins known to bind the lectin. This provides a guideline for the user and assures the quality of our agarose bound lectins. Inhibiting/Eluting Sugar: 200 mM N-acetylgalactosamine. *3 mg lectin/ml gel.

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