Transient co-expression with three O -glycosylation enzymes allows production of GalNAc- O -glycosylated Granulocyte-Colony Stimulating Factor in N. benthamiana

Background Expression of economically relevant proteins in alternative expression platforms, especially plant expression platforms, has gained significant interest in recent years. A special interest in working with plants as bioreactors for the production of pharmaceutical proteins is related to low production costs, product safety and quality. Among the different properties that plants can also offer for the production of recombinant proteins, protein glycosylation is crucial since it may have an impact on pharmaceutical functionality and/or stability. Results The pharmaceutical glycoprotein human Granulocyte-Colony Stimulating Factor was transiently expressed in Nicotiana benthamiana plants and subjected to mammalian-specific mucin-type O -glycosylation by co-expressing the pharmaceutical protein together with the glycosylation machinery responsible for such post-translational modification. Conclusions The pharmaceutical glycoprotein human Granulocyte-Colony Stimulating Factor can be expressed in N. benthamiana plants via agroinfiltration with its native mammalian-specific mucin-type O -glycosylation.