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Effect of HIV constructs containing protease-reverse transcriptase fusion proteins on viral replication
E Cherry1, N Morin, M A Wainberg
1McGill University AIDS Centre, Lady Davis Institute-Jewish General Hospital, Montreal, Quebec, Canada.
AIDS (London, England)
|July 14, 1998
Summary
Disrupting the HIV-1 protease-reverse transcriptase (RT) cleavage site created a fusion protein that interfered with wild-type HIV replication. This suggests potential for trans-dominant negative HIV-1 variants.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Human Immunodeficiency Virus type 1 (HIV-1) replication relies on precise proteolytic cleavage of viral polyproteins.
- The cleavage site between the protease (PR) and reverse transcriptase (RT) is crucial for generating functional viral enzymes.
Purpose of the Study:
- To investigate if mutations disrupting the PR-RT cleavage site can generate trans-dominant negative HIV-1 variants.
- To assess the impact of such variants on wild-type HIV-1 replication.
Main Methods:
- Mutagenesis of the PR-RT cleavage site in a full-length HIV-1 provirus.
- Expression of a PR-RT fusion protein in COS-7 cells and analysis of viral lysates.
- Cotransfection studies to evaluate the interference with wild-type HIV-1 replication.
Main Results:
- A novel mutation successfully created a functional PR-RT fusion protein, preventing normal cleavage.
- Viruses with the PR-RT fusion protein exhibited reduced infectivity compared to wild-type.
- Overexpression of the mutant PR-RT fusion protein, combined with a frameshift mutation, exacerbated the replication defect.
- Cotransfection demonstrated that mutant constructs inhibited wild-type HIV-1 replication and reduced viral particle infectiousness.
Conclusions:
- HIV-1 constructs with a disrupted PR-RT cleavage site can function as trans-dominant negative mutants.
- These mutants interfere with wild-type HIV-1 replication, offering a potential avenue for antiviral strategies.