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A general strategy for the isolation of carbohydrate chains fromN-,O-glycoproteins and its application to human chorionic gonadotrophin

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Abstract

For the structural analysis of the carbohydrate chains ofN-,O-glycoproteins a straightforward strategy was developed based on the cleavage of theN-linked chains with immobilized peptide-N 4-(N-acetyl-β-glucosaminyl) asparagine amidase-F (PN-Gase-F) fromFlavobacterium meningosepticum, followed by alkaline borohydride treatment of the remainingO-glycoprotein material. This methodology was applied to the isolation of the Asn- and Ser-linked carbohydrate chains of human chorionic gonadotrophin. The structures of the isolated oligosaccharides were verified by 500-MHz1H-NMR spectroscopy. The Asn-linked sugar chains were shown to be: NeuAcα2-3Galβ1-4GlcNAcβ1-2Manα1-6[NeuAcα2-3Galβ1-4GlcNAcβ1-2Manα1-3]Man β1-4GlcNAcβ1-4[Fucα1-6]0-1GlcNAc and Manα1-6[NeuAcα2-3Galβ1-4GlcNAcβ1-2Man α1-3]Manβ1-4GlcNAcβ1-4GlcNAc. Also some minor constituents occurred. The structures of the Ser-linked oligosaccharides were established in the form of their oligosaccharide-alditols as: NeuAcα2-3Galβ1-3[NeuAcα2-6]GalNAc, NeuAcα2-3Galβ 1-3GalNAc and NeuAcα2-3Galβ1-3[NeuAcα2-3Galβ1-4GlcNAcβ1-6]GalNAc.

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Abbreviations

hCG:

human chorionic gonadotrophin

hCG-α:

α-subunit

hCG-β:

β-subunit

ElA:

enzyme immunoassay

PNGase-F:

peptide-N 4-(N-acetyl-β-glucosaminyl)asparagine amidase-F (EC 3.5.1.52)

SDS:

sodium dodecyl sulphate

GalNAc:

N-acetylgalactosamine

GlcNAc:

N-acetylglucosamine

NeuAc:

N-acetylneuraminic acid

Man:

mannose

Gal:

galactose

Fuc:

fucose

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Damm, J.B.L., Kamerling, J.P., van Dedem, G.W.K. et al. A general strategy for the isolation of carbohydrate chains fromN-,O-glycoproteins and its application to human chorionic gonadotrophin. Glycoconjugate J 4, 129–144 (1987). https://doi.org/10.1007/BF01049451

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