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The effect of alkaline borohydride treatment onN-linked carbohydrates of glycoproteins

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Abstract

The effects of treatments of the glycoprotein ribonuclease-B, the proteins ribonuclease-A and myoglobin, and the glyco-amino acid GlcNAcβ(1-N) Asn with alkalil alkaline sodium borohydride, and aqueous sodium borohydride were systematically studied as a function of the concentration of the reagents, the temperature, and the length of the treatment. High-field1H-NMR spectroscopy, chromatographic methods and amino-acid analysis were used to characterize products of the treatments of the various compounds. Our results indicate that mild alkaline borohydride treatment, as well as aqueous borohydride treatment alone, is capable of extensively degrading polypeptides and of partially releasing theN-linked glycans from ribonuclease-B. Initially, glycopeptides are produced, the peptide portion of which consists of several amino acids, which are further hydrolyzed to yield a mixture of glyco-asparagines and oligosaccharide-alditols in the ratio of ≈4:1. Strong alkaline borohydride treatment of ribonuclease-B is capable of completely releasing theN-linked carbohydrates as oligosaccharide-alditols.

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Abbreviations

RNase:

ribonuclease

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Authors and Affiliations

  1. Department of Chemistry, Lehigh University, Seeley G. Mudd Building 6, 18015, Bethlehem, PA, USA

    Sulabha P Argade, G Doyle Daves Jr & Jack A Alhadeff

  2. Complex Carbohydrate Research Center, University of Georgia, 30613, Athens, GA, USA

    Herman Van Halbeek

Authors
  1. Sulabha P Argade
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  2. G Doyle Daves Jr
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  3. Herman Van Halbeek
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  4. Jack A Alhadeff
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Argade, S.P., Daves, G.D., Van Halbeek, H. et al. The effect of alkaline borohydride treatment onN-linked carbohydrates of glycoproteins. Glycoconjugate J 6, 45–56 (1989). https://doi.org/10.1007/BF01047889

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  • DOI: https://doi.org/10.1007/BF01047889

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