Chemoenzymatic synthesis of neoglycoproteins using transglycosylation with endo-beta-N-acetylglucosaminidase A

Biochemical and Biophysical Research Communications
Kiyotaka Fujita, Kaoru Takegawa

Abstract

A novel chemoenzymatic approach to synthesize neoglycoproteins containing high-mannose-type oligosaccharides is described. p-Isothiocyanatophenyl-beta-d-glucopyranoside (Glc-ITC) was transferred to the reducing end of the high-mannose-type oligosaccharides using a transglycosylation activity of endo-beta-N-acetylglucosaminidase A (Endo-A). A novel oligosaccharide, Man(6)GlcNAc-Glc-ITC, was synthesized as a coupling reagent for lysyl and N-terminal residues of the protein moiety. The neoglycoconjugate was coupled with several nonglycosylated proteins such as ribonuclease A, lysozyme, and alpha-lactalbumin. Between one and four high-mannose-type oligosaccharides were incorporated per molecule of these proteins. This method should be very useful for the synthesis of neoglycoproteins with homogeneous high-mannose-type oligosaccharides.

References

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Citations

Nov 18, 2009·Journal of the American Chemical Society·Wei HuangLai-Xi Wang
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