title: Primary structure of the oligosaccharide determinant of blood group Cad specificity.
abstract: Glycophorin A and B from Cad erythrocyte membranes are the carriers of the blood group Cad determinants. They are characterized by a significant increase in molecular mass, as compared to the corresponding glycophorins from control erythrocytes (Cartron, J.-P., and Blanchard, D. (1982) Biochem. J. 207, 497-504). Lipid-free glycophorin A, purified from Cad red cells, showed an increased GalNAc content in comparison to blood group B, Cad-negative, control cells. Alkaline-borohydride treatment of this Cad glycophorin A released as a predominant species a pentasaccharide; its structure was determined, by methylation analysis and by 500-MHz 1H-NMR studies, to be: (formula; see text) This novel oligosaccharide inhibited strongly the hemagglutination of Cad erythrocytes by the Dolichos biflorus lectin. It shares with the blood group Sda determinant a terminal GalNAc beta (1 leads to 4)Gal beta (1 leads to .) sequence.
mesh_terms: D001789:Blood Group Antigens / Q000235:genetics*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D000939:Epitopes / Q000032:analysis*; D004910:Erythrocyte Membrane / Q000276:immunology*; D004912:Erythrocytes / Q000276:immunology*; D006021:Glycophorins / Q000276:immunology*; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D009844:Oligosaccharides / Q000276:immunology*; D012795:Sialoglycoproteins / Q000276:immunology*
chemical_list: D001789:Blood Group Antigens; D000939:Epitopes; D006021:Glycophorins; D009844:Oligosaccharides; D012795:Sialoglycoproteins