An immunochemical study of the human blood group P1, P, and PK glycosphingolipid antigens.

Biochemistry
M Naiki, D M Marcus

Abstract

The erythrocyte PK and P blood group antigens have been identified as ceramide trihexoside (CTH), Gal-(alpha, 1 leads to 4)Gal(beta, 1 leads to 4)Glc-Cer, and globoside, GalN-Ac(beta, 1 leads to 3)Gal(alpha, 1 leads to 4)Gal(beta, 1 leads to 4)Glc-Cer, respectively, and the following structure has been proposed for the P1 antigen: Gal(alpha, 1 leads to 4)Gal(beta, 1 leads to 4)GlcNAc(beta, 1 leads to 3)Gal(beta, 1 leads to 4)Glc-Cer. Although the P1 and PK determinants have identical terminal disaccharides, CTH did not inhibit anti-P1. The P1 glycolipid and hydatid cyst glycoprotein inhibited the agglutination of P1K erythrocytes by anti-P1 and unabsorbed anti-P1PPK sera, but neither antigen inhibited a specific anti-PK serum. The P1 and PK glycolipids were equally effective in inhibiting the hemagglutinating activity of a lectin with alpha-galactosyl specificity obtained from ova of Salmo trutta. Anti-P sera were inhibited most effectively by human erythrocyte globoside, and to a lesser extent by Forssman glycolipid and rat kidney globoside. In the latter glycolipid the linkage between the internal galactosyl residues is alpha, 1 leads to 3, rather than alpha, 1 leads to 4, as in erythrocyte globoside. No cross-reactions betwe...Continue Reading

Citations

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