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A functional hepatitis B virus X protein produced in insect cells
D F Spandau1, H G Wang, M J Fraser
1Department of Pathology, Indiana University School of Medicine, Indianapolis 46202.
Virology
|December 1, 1991
Summary
Researchers created a recombinant baculovirus to express hepatitis B virus X protein in insect cells. The insect-produced protein demonstrated functional transactivation, proving it identical to mammalian-produced X protein.
Area of Science:
- Molecular Biology
- Virology
- Biotechnology
Background:
- Hepatitis B virus (HBV) X protein plays a crucial role in viral pathogenesis.
- Efficient and functional expression of viral proteins in heterologous systems is vital for research.
Purpose of the Study:
- To construct a recombinant baculovirus for expressing the HBV X protein in insect cells.
- To assess the biological activity and functionality of the insect cell-produced HBV X protein.
Main Methods:
- Construction of recombinant baculovirus AcX expressing HBV X protein.
- Detection of X protein (monomer and dimer) in infected insect cells via immunoblotting.
- Functional assays involving cell fusion and reporter gene expression (pSV2cat).
- Verification of transactivation function using scrape-loading and antibody neutralization.
Main Results:
- Recombinant baculovirus AcX successfully expressed HBV X protein in Spodoptera frugiperda (Sf21AE) cells.
- Detected X protein as a 16.5-kDa monomer and 33-kDa dimer.
- Insect cell-produced X protein exhibited significant transactivation activity (seven-fold increase in reporter gene expression).
- Transactivation activity was specifically neutralized by anti-X antisera.
Conclusions:
- The insect cell-produced HBV X protein is functional and biologically active.
- Insect cell expression system provides a viable method for producing functional HBV X protein.
- Insect cell-derived X protein is functionally equivalent to its mammalian counterpart.