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Bioengineering 2017, 4(2), 44; doi:10.3390/bioengineering4020044

Comparative N-Glycosylation Analysis of the Fc Portions of a Chimeric Human Coagulation Factor VIII and Immunoglobulin G1

Octapharma Biopharmaceuticals GmbH, Molecular Biochemistry, Walther-Nernst-Strasse 3, 12489 Berlin, Germany
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Academic Editors: Stephan Hinderlich and Hans Henning von Horsten
Received: 13 April 2017 / Revised: 10 May 2017 / Accepted: 11 May 2017 / Published: 17 May 2017
(This article belongs to the Special Issue Recombinant Glycoproteins)
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Abstract

Prevention and treatment of bleeding in patients suffering from hemophilia A are inconvenient due to repeated intravenous infusions owing to the short half-life of coagulation factor VIII (FVIII) in circulation. Besides (glyco-)pegylation of the FVIII molecule, a bioengineering approach comprises the protein fusion to Fc-immunoglobulin (Ig)G that mediate protection from clearance or degradation via binding to the neonatal Fc receptor. While human-like N-glycosylation of recombinant FVIII is known to be crucial for the clotting factor’s quality and function, the particular glycosylation of the fused Fc portion has not been investigated in detail so far, despite its known impact on Fcγ receptor binding. Here, we analyzed the N-glycosylation of the Fc part of a chimeric FVIII-Fc protein compared to a commercial IgG1 purified from human plasma. Fc parts from both samples were released by enzymatic cleavage and were subsequently separated via sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Corresponding protein bands were referred to PNGase F in-gel digestion in order to release the respective N-glycans. Analysis via matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry revealed structural differences of both N-glycan patterns. Labeling with 2-aminobenzamide (2AB) and analysis via hydrophilic interaction liquid chromatography (HILIC) allowed a quantitative comparison of the respective N-glycosylation. Observed variations in Fc glycosylation of the chimeric FVIII fusion protein and human plasma-derived IgG1, e.g., regarding terminal sialylation, are discussed, focusing on the impact of the clotting factor’s properties, most notably its binding to Fcγ receptors. View Full-Text
Keywords: Fc-fusion; immunoglobulin G; immunomodulation; N-glycosylation; recombinant FVIII Fc-fusion; immunoglobulin G; immunomodulation; N-glycosylation; recombinant FVIII
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kannicht, C.; Kröning, M.; Solecka-Witulska, B.A.; Kohla, G.; Rosenlöcher, J. Comparative N-Glycosylation Analysis of the Fc Portions of a Chimeric Human Coagulation Factor VIII and Immunoglobulin G1. Bioengineering 2017, 4, 44.

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