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Morphogenesis of recombinant HIV-2 gag core particles
1Deutsches Primatenzentrum, Abteilung Virologie und Immunologie, Göttingen, Germany.
Virus Research
|July 1, 1992
Summary
Expression of HIV-2 gag and pol genes using recombinant vaccinia virus (VV) revealed that the 3' end of the gag gene is crucial for complete particle formation, while pol proteins aid viral core assembly.
Area of Science:
- Virology
- Molecular Biology
- Retroviral Research
Background:
- The human immunodeficiency virus type 2 (HIV-2) gag-pol coding region is essential for viral particle production.
- Understanding the specific roles of gag and pol proteins in HIV-2 assembly is critical for developing antiviral strategies.
Purpose of the Study:
- To investigate the function of HIV-2 gag and pol gene products in viral particle formation using recombinant vaccinia viruses (VV).
- To determine the contribution of different gag and pol gene regions to the assembly of complete retroviral particles.
Main Methods:
- Expression of various HIV-2 gag-pol constructs in CV-1 cells via recombinant VV infection.
- Detection and analysis of viral proteins using cell lysate comparison and Western blotting.
- Electron microscopy to visualize viral particle formation and maturation.
Main Results:
- Recombinant VV expressing gag-pol proteins produced mature and immature retroviral particles.
- Deletion of the protease-coding region prevented gag precursor cleavage.
- Expression of the truncated gag gene resulted in budding structures but not complete particles.
- Complete, mature virions were only observed with the full gag-pol expression.
Conclusions:
- The 3' end of the HIV-2 gag gene, coding for the p16 protein, is essential for the formation of complete HIV-2 particles.
- HIV-2 pol proteins play a supportive role in the assembly of the viral core structure.