title: Further characterization of type 2 and type 3 chain blood group A glycosphingolipids from human erythrocyte membranes.
abstract: Blood group A glycosphingolipids with slow chromatographic mobilities have been separated systematically with an improved chromatographic procedure, and their structures have been analyzed by application of a panel of monoclonal antibodies defining A determinants carried by type 1, type 2, type 3, and type 4 carbohydrate chains as well as by 1H NMR spectroscopy and methylation analysis. Of several A-active fractions, previously termed Aa, Ab, Ac, and Ad, in decreasing order of thin-layer chromatographic mobility, the third fraction (Ac) was characterized as containing one type 3 chain A component and one type 2 chain A component without branching, which have been termed type 3 chain Ab and nor-Ac, respectively. (Formula: see text). The major component present in the fourth A-active fraction (Ad) was isolated and characterized as a branched type 2 chain glycolipid formerly termed Ac. The major component in the fifth A-active fraction (Ae) was identified as a branched type 2 chain A previously termed Ad. The structures of Ac (n = 1) and Ad (n = 2) are (Formula: see text).
mesh_terms: D000017:ABO Blood-Group System; D000911:Antibodies, Monoclonal; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002855:Chromatography, Thin Layer / Q000379:methods; D004910:Erythrocyte Membrane / Q000032:analysis; D006028:Glycosphingolipids / Q000097:blood* / Q000302:isolation & purification; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods
chemical_list: D000017:ABO Blood-Group System; D000911:Antibodies, Monoclonal; D006028:Glycosphingolipids