Use of HDEL-taggedTrichoderma reeseimannosyl oligosaccharide 1,2-α-D-mannosidase forN-glycan engineering inPichia pastoris

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Abstract
Therapeutic glycoprotein production in the widely used expression host Pichia pastoris is hampered by the differences in the protein-linked carbohydrate biosynthesis between this yeast and the target organisms such as man. A significant step towards the generation of human-compatible N -glycans in this organism is the conversion of the yeast-type high-mannose glycans to mammalian-type high-mannose and/or complex glycans. In this perspective, we have co-expressed an endoplasmic reticulum-targeted Trichoderma reesei 1,2-α- D -mannosidase with two glycoproteins: influenza virus haemagglutinin and Trypanosoma cruzi trans -sialidase. Analysis of the N -glycans of the two purified proteins showed a >85% decrease in the number of α-1,2-linked mannose residues. Moreover, the human-type high-mannose oligosaccharide Man 5 GlcNAc 2 was the major N -glycan of the glyco-engineered trans -sialidase, indicating that N -glycan engineering can be effectively accomplished in P. pastoris .