Abstract
A novel enzymatic approach was developed for facile production of glycopeptides carrying natural eukaryotic N-glycans. In this approach, peptides can be GlcNAcylated at one or two natural N-glycosylation sites via two-step enzymatic reactions catalyzed by an evolved N-glycosyltransferase (ApNGTQ469A) and a glucosamine N-acetyltransferase (GlmA), respectively. The resulting GlcNAc-peptides were further modified by an endo-β-N-acetylglucosaminidase M mutant (EndoMN175Q) to generate glycopeptides. In three steps of enzymatic catalysis, glycopeptides carrying complex-type N-glycans can be efficiently synthesized.
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