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  • Title: Structure of the carbohydrate moieties of bovine rhodopsin.
    Author: Liang CJ, Yamashita K, Muellenberg CG, Shichi H, Kobata A.
    Journal: J Biol Chem; 1979 Jul 25; 254(14):6414-8. PubMed ID: 447724.
    Abstract:
    The sugar chains of bovine rhodopsin were released from the polypeptide moiety by hydrazinolysis and reduced with NaB[3H]4 after N-acetylation. The radioactive oligosaccharides thus obtained were fractionated into three components by paper chromatography. The structures of these components were elucidated as GlcNAc beta 1 leads to 2Man alpha 1 leads to 3 (Man alpha 1 leads to 6)Man beta 1 leads to 4GlcNAc beta 1 leads to 4GlcNAc, GlcNAc beta 1 leads to 2Man alpha 1 leads to 3(Man alpha 1 leads to 3 and 6 Man alpha 1 leads to 6)Man beta leads to 4GlcNAc beta 1 leads to 4GlcNAc, and GlcNAc beta 1 leads to 2Man alpha 1 leads to 3(Man alpha 1 leads to 3 (Man alpha 1 leads to 6)Man alpha 1 leads to 6)Man beta 1 leads to 4GlcNAc beta 1 leads to 4GlcNAc, by sequential exoglycosidase digestion, methylation analysis, and endo-beta-N-acetylglucosaminidase D digestion. The unusual features of the sugar chains of rhodopsin molecule seem to support the proposed processing pathway for the biosynthesis of asparagine-linked sugar chains of glycoproteins.
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