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Full-length core sequence dependent complex-type glycosylation of hepatitis C virus E2 glycoprotein
Li-Xin Zhu1, Jing Liu, Ying-Chun Li
1Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China.
World Journal of Gastroenterology
|June 5, 2002
Summary
Full-length core sequences are essential for producing mature hepatitis C virus (HCV) E2 glycoproteins. This finding is crucial for understanding HCV processing and developing effective vaccines against the virus.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- Hepatitis C virus (HCV) polyprotein processing is vital for understanding viral pathogenesis and designing effective vaccines.
- The E2 glycoprotein is a key target for therapeutic and prophylactic interventions against HCV.
Purpose of the Study:
- To investigate the impact of upstream context sequences on the post-translational processing of the HCV E2 glycoprotein.
- To elucidate the role of the core coding sequence in the maturation and glycosylation of E2.
Main Methods:
- Expression of HCV genes of varying lengths in a vaccinia virus/T7 system.
- Utilized homologous patient serum (S94) and specific mouse anti-serum (M(E2116)) for detection.
- Performed deglycosylation analysis and Galanthus nivalus (GNA) lectin binding assays to assess glycosylation status.
Main Results:
- Detected E2 glycoproteins with distinct molecular weights (-75 kDa and -60 kDa) dependent on the detection antibody.
- Deglycosylation analysis revealed that the size difference was primarily due to variations in glycosylation patterns.
- Complex-type glycosylation of E2, recognized by patient serum S94, was observed only in constructs encoding full-length core sequences, not in core-truncated variants.
Conclusions:
- The full-length upstream core coding sequence is necessary for the production of complex-type N-glycans on E2 glycoproteins.
- Complex-type N-glycans suggest modification by Golgi enzymes, indicating that the full-length core may be critical for the E1/E2 complex to exit the endoplasmic reticulum.
- These findings enhance the understanding of HCV structural protein processing and viral morphogenesis, potentially aiding vaccine development.