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The Asparagine-linked Carbohydrate of Honeybee Venom Hyaluronidase

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Journal Glycoconj J
Publisher Springer
Date 1995 Feb 1
PMID 7795417
Citations 24
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Abstract

Hyaluronidase from the venom of the honeybee (Apis mellifera) has been purified by gelpermeation and cation exchange chromatography. Its asparagine-linked carbohydrate chains were released from tryptic glycopeptides with N-glycosidase A and reductively aminated with 2-aminopyridine. Separation of the fluorescent derivatives by size-fractionation and reversed-phase HPLC afforded eighteen fractions which were analysed by two-dimensional HPLC mapping combined with exoglycosidase digestions. The bulk of the N-linked glycans of hyaluronidase consisted of small oligosaccharides (Man1-3GlcNAc2), most of which were either alpha 1,3-monofucosylated or alpha 1,3-(alpha 1,6-)difucosylated at the innermost GlcNAc residue. High-mannose type structures constituted the minor fractions, together making up about 5% of the oligosaccharide pool from hyaluronidase. Four fractions, making up 8% of the N-linked glycans, contained the terminal trisaccharide GalNAc beta 1-4[Fuc alpha 1-3]GlcNAc beta 1- in beta 1,2-linkage to the core alpha 1,3-mannosyl residue. No evidence for the presence of O-glycans or sialic acids could be found.

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