Synthesis of neoglycoproteins using oligosaccharide-transfer activity with endo-β-N-acetylglucosaminidase

K. Takegawa, M. Tabuchi, S. Yamaguchi, A. Kondo, I. Kato, S. Iwahara

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112 Citations (Scopus)


We describe a novel method for the enzymatic synthesis of neoglycoproteins. Endo-β-N-acetylglucosaminidase from Arthrobacter protophormiae (Endo-A) had high levels of transglycosylation activity. The enzyme activity of Endo-A was markedly increased by adding 4-L-aspartyl- glycosylamine (GlcNAc-Asn) to the reaction mixture. Digesting (Man)6(GlcNAc)2 with the enzyme in the presence of GlcNAc-Asn gave a mixture of hydrolytic ((Man)6(GlcNAc) and transglycosylic ((Man)6(GlcNAc)2-Ash) products. By means of transglycosylation, (Man)6GlcNAc was transferred en bloc to the partially deglycosylated ovalbumin glycopeptide (EEKYN(GlcNAc) LTSVL) concomitant with the hydrolysis of (Man)6(GlcNAc)2Asn. The structure of the transglycosylation product was designated as (Man)6(GlcNAc)2-peptide by amino acid composition and sequence analysis as well as ion mass spectrometry. The enzyme also transferred oligosaccharide to partially deglycosylated ribonuclease B (GlcNAc-protein) during the hydrolysis of (Man)6(GlcNAc)2Asn. Native ribonuclease B had (Man)5-9 (GlcNAc)2 as its heterogeneous N-linked sugar chains. High performance liquid chromatography showed that all of the N- linked sugar chains of the synthetic neoribonuclease of the pyridylamino derivatives were modified to (Man)6(GlcNAc)2.

Original languageEnglish
Pages (from-to)3094-3099
Number of pages6
JournalJournal of Biological Chemistry
Issue number7
Publication statusPublished - 1995
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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