Three-dimensional elution mapping of pyridylaminated N-linked neutral and sialyl oligosaccharides

Analytical Biochemistry
N TakahashiN Tomiya

Abstract

We propose a three-dimensional (3-D) sugar-mapping technique for pyridylaminated (PA) neutral and sialyl oligosaccharides as a powerful structural characterization of N-linked oligosaccharides using only picomoles of samples. The new map consists of the elution data from 42 different sialyl oligosaccharides, 26 of which are mono-, 7 of which are di-, 7 of which are tri-, and 2 of which are tetra-sialylated oligosaccharides. The 20 standard sialyl oligosaccharides were released from human serum and calf fetuin by digestion with glycoamidase A. The other 22 standard sialyl oligosaccharides were obtained by subsequent digestion of the above 20 sialyl oligosaccharides with beta-galactosidase, beta-N-acetylhexosaminidase, alpha-fucosidase, and alpha 2-->3 specific sialidase. The present 3-D mapping method involves the following four steps: First, a neutral and sialyl PA-oligosaccharide mixture is separated by HPLC on the diethylaminoethyl (DEAE) column according to the sialic acid content, and the elution data are considered as one of the three dimensions (Z-axis). Then, neutral, mono-, di-, tri-, and tetra-sialyl oligosaccharides are individually separated on the octadecylsilyl (ODS)-silica (X-axis) and amide-silica (Y-axis) column...Continue Reading

Citations

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