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A sialoglycoprotein with an approx. mol.wt. of 95000 was isolated from human lymphoblastoid cells of a MOLT-4B cell line, which was of human T-lymphocyte origin, by ion-exchange chromatography, affinity chromatography on a column of wheat-germ agglutinin-Sepharose and preparative slab-gel electrophoresis. The localization of this glycoprotein on the cell surface was indicated by surface labelling by the periodate/NaB3H4 and lactoperoxidase-catalysed iodination methods. Carbohydrate analyses of this glycoprotein revealed that its total carbohydrate content is 28% (w/w), and it contains fucose, galactose, mannose, N-acetylglucosamine, N-acetylgalactosamine and sialic acid in molar proportions 1.0:4.0:3.7:3.5:1.2:2.5, suggesting that it has two types of sugar chain, i.e. sugar chains like those of serum glycoproteins and sugar chains of the type found in mucins. Actually, alkaline borohydride treatment of this glycoprotein yielded tri- and tetra-saccharide, the latter containing 1 molecule of fucose in addition to each molecule of galactose, N-acetylgalactosamine and sialic acid. This glycoprotein bound to Ricinus communis agglutinin and concanavalin A as well as to wheat-germ agglutinin.

Isolation and partial characterization of the major sialoglycoprotein of human T-lymphoblastoid cells of a MOLT-4B cell line