Abstract
Sialic acids and the majorO-glycosidic oligosaccharide of glycophorin MK from monkey (Japanese monkey,Macaca fuscata) erythrocyte membranes were characterized.N-Glycolylneuraminic acid (neu5Gc) was found as the major sialic acid, which was confirmed by gas-liquid chromatography-mass spectrometry as the trimethylsilyl methyl ester. ThreeO-glycosidic oligosaccharide units were obtained from a tryptic glycopeptide that contained all of the carbohydrate units in glycophorin MK by mild alkaline borohydride/borotritide treatment. Carbohydrate analyses of the oligosaccharides revealed that they were composed of Neu5Gc, galactose andN-acetylgalactosaminitol in the molar ratios of 1∶1∶1 (trisaccharide), 2∶1∶1 (tetrasaccharide) and 1∶1∶1 (pentasaccharide). The content of oligosaccharide units was estimated to be 1∶12∶5 for penta-, tetra- and trisaccharide, respectively, based on the yields, the molecular weight, and the number of oligosaccharide attachment sites in the amino-acid sequence. The tetrasaccharide was the major oligosaccharide and its structure was proposed to be Neu5Gcα2-3Galβ1-3[Neu5Gcα2-6]GalNAcol.
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Murayama, JI., Manabe, H., Fukuda, K. et al. Structure of the majorO-glycosidic oligosaccharide of monkey erythrocyte glycophorin. Glycoconjugate J 6, 499–510 (1989). https://doi.org/10.1007/BF01053773
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DOI: https://doi.org/10.1007/BF01053773