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  • Title: Asparagine-linked sugar chains of fetuin: occurrence of tetrasialyl triantennary sugar chains containing the Gal beta 1----3GlcNAc sequence.
    Author: Takasaki S, Kobata A.
    Journal: Biochemistry; 1986 Sep 23; 25(19):5709-15. PubMed ID: 2430614.
    Abstract:
    Asparagine-linked sugar chains were quantitatively released from fetuin by hydrazinolysis. Structural analysis of the sugar chains by sequential exoglycosidase digestion in combination with methylation analysis and Smith degradation revealed that most of them have typical biantennary (8%) and triantennary (74%) structures containing different amounts of N-acetylneuraminic acid residues. In addition, an unusual tetrasialyl triantennary sugar chain (17%) containing the Gal beta 1----3GlcNAc sequence in the outer chain moiety was detected, and its structure was elucidated as NeuAc alpha 2----3Gal beta 1----3(NeuAc alpha 2----6)-GlcNAc beta 1----4(NeuAc alpha 2----6Gal beta 1----4GlcNAc beta 1----2)Man alpha 1----3(NeuAc alpha 2----3Gal beta 1----4GlcNAc beta 1----2Man alpha 1----6)Man beta 1----4GlcNAc beta 1----4GlcNAc.
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