ABSTRACT
Purpose
Oligosaccharides play diverse and unpredictable functional roles when attached to proteins and are a largely unexplored scaffold for deconstructing and attributing novel functions to proteins during drug development. Here, the glycoprotein Artemin (ART) was carefully assessed by multiple analytical methods that allow us to provide a comprehensive understanding of how N-linked glycosylation impact the structural and functional properties of ART.
Methods
Modification of the N-linked glycan of ART was performed by incubation with various enzymes. Biological assays and systems were used to examine the relative activity and pharmacokinetic properties of ART as a function of glycosylation. In order to reveal the conformational impact of glycosylation on ART, hydrogen/deuterium exchange mass spectrometry (HDX-MS) was employed in addition to differential scanning calorimetry. The colloidal stability of ART glycovariants was assessed by dynamic light scattering, viscometry, and solubility assays.
Results
No difference in pharmacokinetics or relative potency was revealed between glycosylated and nonglycosylated ART. Surprisingly, the HDX-MS data indicated that the glycan does not greatly influence the conformation and dynamics of the protein. In contrast, differences in thermal and colloidal stability clearly revealed a role of glycosylation in increasing the solubility and stability of ART.
Conclusions
Our findings demonstrate how careful analysis using multiple advanced techniques can be used to identify and dissect the multiple potential functions of protein glycosylation and form a prerequisite for glycoengineering and drug development of glycoproteins.
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Abbreviations
- ART:
-
Artemin
- CE-SDS:
-
Sodium-dodecyl sulfate capillary electrophoresis
- CHO:
-
Chinese Hamster Ovary
- DA:
-
Dopaminergic
- DLS:
-
Dynamic light scattering
- DSC:
-
Differential scanning calorimetry
- GDNF:
-
Glial cell line-derived neurotrophic factor
- GFLs:
-
GDNF family of ligands
- GFRα:
-
GDNF family receptor-α
- GlcNAc:
-
N-acetylglucosamine
- GPI:
-
Glycosylphosphatidylinositol
- HDX-MS:
-
Hydrogen/Deuterium exchange mass spectrometry
- KIRA:
-
Kinase receptor activation
- NeuAc:
-
Sialic acid
- NRTN:
-
Neurturin
- pI:
-
Isoelectric point
- PSPN:
-
Persephin
- RET:
-
REarranged during Transfection receptor tyrosine kinase
- RMSD:
-
Root mean square deviation
- SCX:
-
Strong cation-exchange
- TCEP:
-
Tris(2-carboxyethyl)phosphine hydrochloride
- TGF-β:
-
Transforming growth factor-β
- UPLC:
-
Ultra performance liquid chromatography
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ACKNOWLEDGMENTS AND DISCLOSURES
We thank Paul Carmillo and Yan Gao for performing the KIRA assays, Susan Foley for performing analytical measurements, Tony Rossomando for helpful discussions, and Tia Estey for her continuous support. KDR acknowledges support from The Marie Curie Actions Programme of the E.U (Grant No. PCIG09-GA-2011-294214) and the Danish Council for Independent Research Natural Sciences (Steno Grant No. 11- 104058).
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Danwen, Q., Code, C., Quan, C. et al. Investigating the Role of Artemin Glycosylation. Pharm Res 33, 1383–1398 (2016). https://doi.org/10.1007/s11095-016-1880-x
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DOI: https://doi.org/10.1007/s11095-016-1880-x