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J. Biol. Chem., Vol. 262, Issue 30, 14600-14605, Oct, 1987

Structure of the carbohydrate moiety of human interferon-beta secreted by a recombinant Chinese hamster ovary cell line

HS Conradt, H Egge, J Peter-Katalinic, W Reiser, T Siklosi and K Schaper
Department of Genetics, Gesellschaft fur Biotechnologische Forschung mbH, Braunschweig, Federal Republic of Germany.

The carbohydrate structure of the major oligosaccharide of human interferon-beta (IFN-beta) synthesized by a genetically engineered Chinese hamster ovary cell line has been determined. Analysis of the glycopeptidase F-released carbohydrates by sequential exoglycosidase treatment, methylation analysis, and fast atom bombardment-mass spectrometry revealed that 95% of the IFN-beta oligosaccharides had the following structure: (Formula: see text). The remaining 5% of the carbohydrates are probably tri- or higher antennary oligosaccharide chains. The major oligosaccharide of the recombinant IFN-beta is remarkably homogeneous with respect to terminal galactose sialylation. NeuAc, which is alpha 2-3-linked to galactose in the human IFN-beta secreted by Chinese hamster ovary cells, can be re-incorporated with an alpha 2-6 linkage in vitro, into enzymatically desialylated IFN-beta using rat liver Gal beta 1-4GlcNAc alpha 2-6 sialyltransferase. The sugar chain is important for maintaining protein solubility as shown by the fact that IFN-beta protein precipitates after deglycosylation with glycopeptidase F.
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