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A lectin was purified from the root of Lotononis bainesii Baker by affinity chromatography on Sepharose-blood group substance A + H. The molecular weight of the lectin was estimated by gel filtration to be 118,000. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicated that the lectin was a tetramer composed of two slightly different subunits with respective molecular weights of 32,000 and 35,000. The lectin had a hexose content of 12% (w/w) and contained the sugars fucose, glucosamine, mannose, and xylose. Root lectin hemagglutination was preferentially inhibited by disaccharides with terminal nonreducing galactose residues. Antigens capable of cross-reaction with root lectin antibody were not detected in the seed of L. bainesii.A lectin from the seed of L. bainesii was partially purified by adsorption to pronase-treated rabbit erythrocytes. The lectin preparation had a molecular weight of approximately 200,000. Galactose and galactono-1,4-lactone inhibited seed lectin hemagglutination but lactose was ineffective. There was no evidence that the root of L. bainesii contained material antigenically related to the seed lectin.

Properties of Lectins in the Root and Seed of Lotononis bainesii