Grafting glycoprotein-derived oligosaccharides structures onto non-glycosylated polypeptides.

Properties of recombinant glycoproteins can be altered by the addition of oligosaccharide structures specific to the cells used for its heterologous expression. A methodology was implemented to obtain a glycopeptide preparation useful to elucidate the role of carbohydrates in the immunogenicity and antigenicity of glycoproteins. It consists on the digestion of the protein, followed by selective capture of the oligosaccharides bound to di-/tripeptides, and their grafting onto a non-glycosylated receptor protein by chemical crosslinking. Glycopeptides derived from C-RBD-H6 PP protein, the active ingredient of the Abdala vaccine were efficiently grafted onto a non-glycosylated protein as evidenced by western blotting.