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Formation of native hepatitis C virus glycoprotein complexes
V Deleersnyder1, A Pillez, C Wychowski
1Unité d'oncologie moléculaire, CNRS-URA1160, Institut Pasteur de Lille, France.
Journal of Virology
|January 1, 1997
Summary
Researchers developed a new monoclonal antibody (H2) to identify properly folded hepatitis C virus (HCV) E1E2 glycoprotein complexes. This antibody aids in studying HCV assembly and developing diagnostics and vaccines.
Area of Science:
- Virology
- Immunology
- Structural Biology
Background:
- Hepatitis C virus (HCV) glycoproteins E1 and E2 form a heterodimeric complex crucial for the viral envelope.
- The assembly of functional E1E2 complexes is inefficient and prone to misfolding and aggregation.
- Lack of specific reagents hinders the differentiation between productive and non-productive glycoprotein folding pathways.
Purpose of the Study:
- To develop a novel immunological reagent for characterizing hepatitis C virus (HCV) glycoprotein folding and assembly.
- To isolate and characterize a conformation-sensitive monoclonal antibody targeting the E2 glycoprotein.
Main Methods:
- Cell culture transient-expression assays were used to study glycoprotein complex formation.
- Isolation and characterization of a conformation-sensitive monoclonal antibody (H2) reactive to E2.
- Analysis of the properties of the recognized E1E2 heterodimers, including noncovalent linkage, protease resistance, and association with calnexin.
Main Results:
- A novel monoclonal antibody, H2, was successfully isolated and characterized.
- H2 selectively recognizes slowly maturing, noncovalently linked, and protease-resistant E1E2 heterodimers.
- The recognized E1E2 complexes are detached from the endoplasmic reticulum chaperone calnexin, suggesting a native prebudding conformation.
Conclusions:
- The H2 monoclonal antibody serves as a valuable tool for distinguishing productive HCV E1E2 heterodimers from misfolded aggregates.
- This antibody facilitates basic research into HCV virion assembly and entry mechanisms.
- H2 has potential applications in optimizing the production and isolation of native HCV glycoprotein complexes for diagnostic and vaccine development.