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Enzyme activity gel analysis of human immunodeficiency virus reverse transcriptase
M C Starnes1, W Y Gao, R Y Ting
1Department of Pharmacology, School of Medicine, University of North Carolina, Chapel Hill 27514.
The Journal of Biological Chemistry
|April 15, 1988
Summary
The p66 component of human immunodeficiency virus (HIV) reverse transcriptase is catalytically active, responsible for DNA synthesis. The p51 component showed no DNA synthetic activity in this study.
Area of Science:
- Biochemistry
- Virology
- Molecular Biology
Background:
- Human immunodeficiency virus (HIV) reverse transcriptase is a key enzyme for viral replication.
- Understanding the specific roles of its subunits is crucial for developing antiviral therapies.
Purpose of the Study:
- To identify the catalytically active component of HIV reverse transcriptase.
- To differentiate the enzymatic functions of the p66 and p51 subunits.
Main Methods:
- Activity gel analysis of purified HIV reverse transcriptase and infected cell extracts.
- Denaturing polyacrylamide gel electrophoresis (PAGE) and sodium dodecyl sulfate (SDS) removal.
- Assays for DNA and RNA-directed DNA synthesis.
Main Results:
- Purified HIV reverse transcriptase consists of approximately equal proportions of p66 and p51 proteins.
- The p66 component was sufficient for both DNA- and RNA-directed DNA synthesis.
- No DNA synthetic activity was detected for the p51 component.
Conclusions:
- The p66 subunit of HIV reverse transcriptase possesses the catalytic activity for DNA synthesis.
- The p51 subunit does not appear to contribute to the DNA synthetic function of the enzyme.
- No other HIV-specific DNA polymerases were identified in infected cell extracts besides p66.