Abstract
The interactions of a high mannose type glycopeptide with Concanavalin A has been investigated by quantitative precipitation analysis. The equivalence points of the precipitin curves indicate that the glycopeptide is bivalent for lectin binding. These results and others demonstrate that there are two lectin binding sites per molecule of the glycopeptide: one site on the α(1–6) arm of the core β-mannose residue involving a trimannosyl moiety, and another site on the α(1–3) arm of the core β-mannose residue involving an α(1–2) mannobiosyl group. The two sites are unequal in their affinities, and bind by different mechanisms. These results are related to the possible structure-function properties of high mannose type of glycopeptides on the surface of cells.
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