Cellular Binding of Hepatitis C Virus Envelope Glycoprotein E2 Requires Cell Surface Heparan Sulfate

Barth, Heidi
Schäfer, Christiane
Adah, Mohammed I.
Zhang, Fuming
Linhardt, Robert J.
Toyoda, Hidenao
Kinoshita-Toyoda, Akiko
Toida, Toshihiko
Van Kuppevelt, Toin H.
Depla, Erik
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Biology , Chemistry and chemical biology , Chemical and biological engineering , Biomedical engineering
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Cellular Binding of Hepatitis C Virus Envelope Glycoprotein E2 Requires Cell Surface Heparan Sulfate, H. Barth, C. Schäfer, M.I. Adah, F. Zhang, R.J. Linhardt, H. Toyoda, A. Kinoshita-Toyoda, T. Toida, T. H. van Kuppevelt, E. Depla, F. von Weizsäcker, H.E. Blum, T.F. Baumert, Journal of Biological Chemistry, 278, 41003 – 41012, 2003.
The conservation of positively charged residues in the N terminus of the hepatitis C virus (HCV) envelope glycoprotein E2 suggests an interaction of the viral envelope with cell surface glycosaminoglycans. Using recombinant envelope glycoprotein E2 and virus-like particles as ligands for cellular binding, we demonstrate that cell surface heparan sulfate proteoglycans (HSPG) play an important role in mediating HCV envelope-target cell interaction. Heparin and liver-derived highly sulfated heparan sulfate but not other soluble glycosaminoglycans inhibited cellular binding and entry of virus-like particles in a dose-dependent manner. Degradation of cell surface heparan sulfate by pretreatment with heparinases resulted in a marked reduction of viral envelope protein binding. Surface plasmon resonance analysis demonstrated a high affinity interaction (KD 5.2 × 10–9m) of E2 with heparin, a structural homologue of highly sulfated heparan sulfate. Deletion of E2 hypervariable region-1 reduced E2-heparin interaction suggesting that positively charged residues in the N-terminal E2 region play an important role in mediating E2-HSPG binding. In conclusion, our results demonstrate for the first time that cellular binding of HCV envelope requires E2-HSPG interaction. Docking of E2 to cellular HSPG may be the initial step in the interaction between HCV and the cell surface resulting in receptor-mediated entry and initiation of infection.
Journal of Biological Chemistry, 278, 41003–41012
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Journal of Biological Chemistry
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