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Fractionation of sialylated oligosaccharides, glycopeptides, and glycoproteins on immobilized elderberry (Sambucus nigra L.) bark lectin


Fractionation of sialylated oligosaccharides, glycopeptides, and glycoproteins on immobilized elderberry (Sambucus nigra L.) bark lectin



Archives of Biochemistry and Biophysics 254(1): 1-8



ISSN/ISBN: 0003-9861

PMID: 3579290

DOI: 10.1016/0003-9861(87)90074-9

A new plant lectin from elderberry (Sambucus nigra L.) bark, which was shown by immunochemical techniques to bind specifically to terminal Neu5Ac(alpha 2-6)Gal/GalNAc residues of glycoconjugates, was immobilized onto Sepharose 4B (SNA-Sepharose) and its carbohydrate binding properties was determined using a series of standard compounds. Oligosaccharides, glycopeptides, or glycoproteins containing terminal Neu5Ac(alpha 2-6)Gal/GalNAc sequences bound to SNA-Sepharose and were eluted with 50-100 mM lactose, whereas those with Neu5Ac(alpha 2-3)Gal/GalNAc failed to bind to this column. Furthermore, the SNA-Sepharose column was capable of resolving two oligosaccharides/glycopeptides based on the number of Neu5Ac(alpha 2-6)Gal units present in each molecule. Application of this technique to two glycoproteins, fetuin and orosomucoid, revealed the presence of microheterogeneity. It was also shown that esterification of the carboxyl group of Neu5Ac units, or branching at the O-3 of the subterminal GalNAc (probably also Gal) destroyed the binding ability of the molecule.

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Accession: 040168543

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