title: A carbohydrate-deficient membrane glycoprotein in human erythrocytes of phenotype S-s-.
abstract: 1. We investigated the membranes of human erythrocytes which completely lack the blood-group antigens S and s (denoted as S-s-) as part of a study of the structure and function of the surface glycoproteins of the human erythrocyte. 2. The S-s-erythrocyte-membrane glycoprotein PAS-3 band was much less intensely stained in comparison with that of the glycoprotein from normal erythrocyte membranes. The S-s-membrane glycoprotein PAS-4 band also showed decreased staining. 3. Examination with the lectins from Maclura aurantiaca (Osage orange) and Arachis hypogaea (groundnut) showed that the PAS-3 glycoprotein of S-s-erythrocyte  membranes lacked the receptors for these lectins that are present on glycoprotein PAS-3 from normal erythrocytes. 4. Radioiodination with lactoperoxidase showed the presence of the polypeptide of glycoprotein PAS-3 in S-s-cells, although it was more weakly labelled than the protein in the normal erythrocyte. 5. Our results show that the PAS-3 glycoprotein of S-s-erythrocytes is deficient in some of the carbohydrates present in the protein from normal erythrocytes. Glycoprotein PAS-4 of normal erythrocytes is shown to be a complex containing both glycoproteins PAS-1 and PAS-3.
mesh_terms: D001789:Blood Group Antigens; D050260:Carbohydrate Metabolism; D004910:Erythrocyte Membrane / Q000032:analysis*; D004912:Erythrocytes / Q000032:analysis* / Q000378:metabolism; D006023:Glycoproteins / Q000097:blood*; D006801:Humans; D007784:Lactoperoxidase / Q000378:metabolism; D037102:Lectins / Q000378:metabolism; D010641:Phenotype
chemical_list: D001789:Blood Group Antigens; D006023:Glycoproteins; D037102:Lectins; D007784:Lactoperoxidase