Abstract

Endo-β-N-acetylglucosaminidase D from Diplococcus pneumoniae released galactosyl oligosaccharides from IgG glycopeptides treated with β-N-acetylglucosaminidase. The structure of the major oligosaccharide was proposed to be as follows. ▪Since α-mannosidase digestion of the β-N-acetylglucosaminidase-treated glycopeptides made them again resistant to the endoglycosidase, we concluded that an unsubstituted α-mannosyl residue was required for the enzymic action.

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