Abstract
Many biopharmaceuticals are now produced as secreted glycoproteins from mammalian cell culture. The glycosylation profile of these proteins is essential to ensure structural stability and biological and clinical activity. However, the ability to control the glycosylation is limited by our understanding of the parameters that affect the heterogeneity of added glycan structures. It is clear that the glycosylation process is affected by a number of factors including the 3-dimensional structure of the protein, the enzyme repertoire of the host cell, the transit time in the Golgi and the availability of intracellular sugar-nucleotide donors. From a process development perspective there are many culture parameters that can be controlled to enable a consistent glycosylation profile to emerge from each batch culture. A further, but more difficult goal is to control the culture conditions to enable the enrichment of specific glycoforms identified with desirable biological activities. The purpose of this paper is to discuss the cellular metabolism associated with protein glycosylation and review the attempts to manipulate, control or engineer this metabolism to allow the expression of human glycosylation profiles in producer lines such as genetically engineered Chinese hamster ovary (CHO) cells.
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Abbreviations
- ADCC:
-
antibody-mediated cytotoxicity
- BHK:
-
baby hamster kidney (cells)
- C2GnT:
-
core 2 GlcNAC transferase (UDP-GlcNAc: Galβ1,3GalNAc-R β1,6-N-acetyl glucosaminyl transferase)
- CHO:
-
Chinese hamster ovary (cells)
- CMP:
-
cytidine monophosphate
- DO:
-
dissolved oxygen
- EPO:
-
erythropoietin
- ER:
-
endoplasmic reticulum
- FT:
-
fucosyl transferase
- G0:
-
agalactosylated glycans
- G1:
-
monogalactosylated glycans
- G2:
-
digalactosylated glycans
- GalNAc:
-
N-acetyl galactosamine
- GDM:
-
GDP mannose 4,6 dehydratase
- GDP:
-
guanosine diphosphate
- GFAT:
-
glutamine: fructose 6-phosphate amidotransferase
- GlcNAc:
-
N-acetyl glucosamine
- GnT:
-
N-acetyl glucosaminyl transferase
- HIV:
-
human immunodeficiency virus
- IFN:
-
interferon
- IgG:
-
immunoglobulin
- LAMP:
-
lysosomal membrane glycoprotein
- ManNAc:
-
N-acetyl mannosamine
- mPL-I:
-
mouse placental lactogen I
- NANA:
-
N-acetyl-neuraminic acid
- NGNA:
-
N-glycolyl-neuraminic acid
- OST:
-
oligosaccharyltransferase
- ST:
-
sialyl transferase
- ST3Gal1:
-
sialyl transferase 3 (CMP-sialic acid: Galβ1,3GalNAc2,3 sialyl transferase)
- TIMP:
-
tissue inhibitors of metalloproteinases
- t-PA:
-
tissue plasminogen activator
- UDP:
-
uridine diphosphate
- UTP:
-
uridine triphosphate
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Butler, M. Optimisation of the Cellular Metabolism of Glycosylation for Recombinant Proteins Produced by Mammalian Cell Systems. Cytotechnology 50, 57–76 (2006). https://doi.org/10.1007/s10616-005-4537-x
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DOI: https://doi.org/10.1007/s10616-005-4537-x