Alkali-labile oligosaccharide units of a sialoglycoprotein from rabbit erythrocyte membranes |
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Authors: | K Fukuda K Honma H Manabe H Utsumi A Hamada |
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Institution: | School of Pharmaceutical Sciences, Showa University, Tokyo, Japan. |
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Abstract: | Two glycoproteins (apparent molecular weights 120,000 and 70,000) were extracted from rabbit erythrocyte membranes, and only one (Mr 120,000), which is a sialoglycoprotein, contained O-glycosidically linked sugar chains. Alkali-labile oligosaccharide units of the sialoglycoprotein were released as reduced oligosaccharides by NaOH-NaB3H4 treatment, and then purified by gel filtration on a Bio-Gel P-4 column followed by ion-exchange chromatography. From the results of methylation analysis, mass spectrometry and chromium trioxide oxidation, the main oligosaccharide unit was determined to be a linear trisaccharide (85% by weight), NeuNGc alpha(2----3)Gal beta(1----3)GalNAcol. In addition, small amounts of a tetrasaccharide (11% by weight) and a disaccharide (4% by weight) were found, which were determined to have the following structures, NeuNGc alpha(2----3)Gal beta(1----3)NeuNGc alpha(2----6)] GalNAcol and Gal-GalNAcol, respectively. |
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