Abstract
Normal human erythrocytes of blood groups A 1, A 2, B and O, and En (a —) erythrocytes lacking glycophorin A, but with A 1B-activity, were surface-labeled with tritiated sodium borohydride after oxidation of terminal galactosyl and N-acetylgalactosaminyl residues with galactose oxidase. A 1 cells were also labeled by lactoperoxidase catalyzed iodination. After solubilization in Triton X-100, the blood group A-active glycoconjugates were isolated using the A-specific lectin from Vicia cracca coupled to Sepharose. No radioactivity was bound from erythrocytes of B and O blood groups. The glycoconjugates from A cell membranes which bound to the lectin and were eluted with 0.01 M N- acetyl- d-galactosamine were analyzed using cylindrical or slab gel electrophoresis in the presence of sodium dodecyl sulfate. The A-active glycoproteins included the major integral glycoprotein, band 3, and many minor, previously poorly defined components. Glycophorins A and B did not contain A-activity.
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