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Keywords:

  • enzyme catalysis;
  • enzymes;
  • glycosylation;
  • oligosaccharides

Abstract

The soluble catalytic domain of human N-acetylglucosaminyltransferase I was purified from Escherichia coli and utilized in the enzyme-catalyzed conversion of high mannose N-linked oligosaccharide 1 into the rare hybrid oligosaccharide 2. Analysis of the reaction showed that the conversion of high mannose 1 into hybrid oligosaccharide 2 proceeded to 100% completion as assessed by MALDI-TOF-MS. Purification of the large polar oligosaccharide by gel filtration and silica gel chromatography afforded a 42% isolated yield of oligosaccharide 2. This enzyme-catalyzed reaction can be utilized to produce rare hybrid oligosaccharides for biochemical and structural studies.