Abstract
The occurrence of polysialosyl sequence has been shown for the first time in the carbohydrate units of glycoprotein isolated from the eggs of rainbow trout. The saccharide chains accounting for 80 % of the weight of the glycoprotein were O-glycosidically linked to the peptide moiety. The reduced saccharides obtained by alkaline borohydride treatment of the glycoprotein contain various amounts of N-glycolylneuraminic acid and were fractionated by a column of DEAE-Sephadex. Analyses of the saccharides containing large amounts of N-glycolylneuraminic acid show that 2 → 8 linked homopolymers of more than 15 N-glycolylneuraminic acid residues were attached to the core composed of 2 galactose, 1 N-acetylgalactosamine, and 1 N-acetylgalactosaminitol residues.
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