SOLUBILIZATION AND PARTIAL CHARACTERIZATION OF A PHYTOHEMAGGLUTININ RECEPTOR SITE FROM HUMAN ERYTHROCYTES
Open Access
- 1 August 1969
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 63 (4), 1439-1446
- https://doi.org/10.1073/pnas.63.4.1439
Abstract
Trypsin treatment of human erythrocytes releases a soluble glycopeptide which binds to phytohemagglutinin and abolishes the erythroagglutinating and lymphocyte-stimulating properties of this molecule. The glycopeptide has been purified by alkaline borohydride treatment, proteolytic digestion, gel filtration, and DEAE-cellulose chromatography. The most highly purified glycopeptide has a molecular weight of about 2,000. The specificity for binding to phytohemagglutinin resides in the oligosaccharide portion of the molecule with the determinant sugar being a galactose residue which is penultimate to a N-acetylneuraminic acid in some chains and uncovered in others. The glycopeptide is about 3,000 times more potent than either N-acetylgalactosamine or galactose in inhibiting the mitogenic response of lymphocytes induced by phytohemagglutinin.Keywords
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