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Gewählte Publikation:

Castilho, A; Gattinger, P; Grass, J; Jez, J; Pabst, M; Altmann, F; Gorfer, M; Strasser, R; Steinkellner, H.
(2011): N-Glycosylation engineering of plants for the biosynthesis of glycoproteins with bisected and branched complex N-glycans.
Glycobiology. 2011; 21(6):813-823 FullText FullText_BOKU

Abstract:
Glycoengineering is increasingly being recognized as a powerful tool to generate recombinant glycoproteins with a customized N-glycosylation pattern. Here, we demonstrate the modulation of the plant glycosylation pathway toward the formation of human-type bisected and branched complex N-glycans. Glycoengineered Nicotiana benthamiana lacking plant-specific N-glycosylation (i.e. beta 1,2-xylose and core alpha 1,3-fucose) was used to transiently express human erythropoietin (hEPO) and human transferrin (hTF) together with modified versions of human beta 1,4-mannosyl-beta 1,4-N-acetylglucosaminyltransferase (GnTIII), alpha 1,3-mannosyl-beta 1,4-N-acetylglucosaminyltransferase (GnTIV) and alpha 1,6-mannosyl-beta 1,6-N-acetylglucosaminyltransferase (GnTV). hEPO was expressed as a fusion to the IgG-Fc domain (EPO-Fc) and purified via protein A affinity chromatography. Recombinant hTF was isolated from the intracellular fluid of infiltrated plant leaves. Mass spectrometry-based N-glycan analysis of hEPO and hTF revealed the quantitative formation of bisected (GnGnbi) and tri- as well as tetraantennary complex N-glycans (Gn[GnGn], [GnGn]Gn and [GnGn][GnGn]). Co-expression of GnTIII together with GnTIV and GnTV resulted in the efficient generation of bisected tetraantennary complex N-glycans. Our results show the generation of recombinant proteins with human-type N-glycosylation at great uniformity. The strategy described here provides a robust and straightforward method for producing mammalian-type N-linked glycans of defined structures on recombinant glycoproteins, which can advance glycoprotein research and accelerate the development of protein-based therapeutics.
Autor*innen der BOKU Wien:
Altmann Friedrich
Grass Josephine
Machado Ferreira Castilho Alexandra
Pabst Martin
Steinkellner Herta
Strasser Richard

Find related publications in this database (Keywords)
erythropoietin
GnTIII
GnTIV
GnTV
Nicotiana benthamiana
N-glycosylation
transferrin


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