HIV-1 Reverse Transcriptase Interactions with DNA Template
Author Information
Author(s): Rutvisuttinunt Wiriya, Meyer Peter R., Scott Walter A.
Primary Institution: Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine
Hypothesis
How does HIV-1 reverse transcriptase interact with the downstream template strand during DNA synthesis?
Conclusion
HIV-1 reverse transcriptase forms stable complexes with the DNA template, showing tight interactions with the first unpaired nucleotide downstream from the primer terminus.
Supporting Evidence
- Cross-linking between RT and the DNA template was most efficient when a bromodeoxyuridine residue was placed in the +2 position.
- Formation of the +1 dNTP•RT•P/T complex showed tight interactions with the first unpaired template nucleotide.
- SA binding to a biotin residue in the +2 position was inhibited when the +1 dNTP•RT•P/T complex was formed.
Takeaway
HIV-1 reverse transcriptase grabs onto the DNA template tightly, especially at the first few nucleotides after the primer, which helps it make new DNA.
Methodology
The study used UV-induced cross-linking and electrophoretic mobility shift assays to analyze the interactions between HIV-1 reverse transcriptase and DNA templates.
Limitations
The study focused on stable complexes and may not have detected weaker interactions that could also be important.
Digital Object Identifier (DOI)
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