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The TAR binding dynamics and its implication in Tat degradation mechanism
Shangbo Ning1, Chengwei Zeng1, Chen Zeng2
1Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, China.
Biophysical Journal
|November 11, 2021
Summary
Researchers investigated how human immunodeficiency virus (HIV) transcription is regulated. They discovered that inhibiting the Tat/P-TEFb interaction halts viral transcription, while inhibiting Tat/TAR interaction reduces viral degradation, offering new therapeutic strategies.
Area of Science:
- Molecular Biology
- Virology
- Structural Biology
Background:
- Human immunodeficiency virus (HIV) transcription involves the viral protein Tat and the host factor P-TEFb.
- A feedback loop exists where TAR RNA fragments promote Tat degradation, regulating viral transcription and potential latency.
Purpose of the Study:
- To investigate the structural dynamics and binding interfaces within the Tat/TAR/P-TEFb complex.
- To elucidate the regulatory mechanisms of HIV genome transcription and latency.
Main Methods:
- All-atom accelerated sampling molecular dynamics simulations were employed.
- The study probed structural ensembles and binding dynamics of key interfaces.
Main Results:
- Inhibitor F07#13 targeting Tat/P-TEFb disrupted the feedback loop, halting active transcription.
- Inhibitor JB181 targeting Tat/TAR prevented Tat degradation by stabilizing the Tat/P-TEFb interaction.
Conclusions:
- Detailed mechanisms of complex dynamics reveal how Tat and TAR regulate HIV transcription versus latency.
- Targeting specific interfaces offers potential therapeutic strategies for HIV infection.
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