A real-time view of the TAR:Tat:P-TEFb complex at HIV-1 transcription sites
2007
Understanding the TAR:Tat:P-TEFb Complex in HIV-1 Transcription
publication
Evidence: moderate
Author Information
Author(s): Molle Dorothée, Maiuri Paolo, Boireau Stéphanie, Bertrand Edouard, Knezevich Anna, Marcello Alessandro, Basyuk Eugenia
Primary Institution: IGMM-CNRS UMR 5535, Montpellier, France
Hypothesis
How does the TAR:Tat:P-TEFb complex behave in living cells during HIV-1 transcription?
Conclusion
The study shows that the dynamic properties of the TAR:Tat:P-TEFb complex are influenced by the mode of recruitment to the HIV-1 promoter.
Supporting Evidence
- The study indicates that Tat occupies HIV-1 transcription sites for 55 seconds.
- Cdk9 remained bound to nascent HIV-1 RNAs for 71 seconds in the presence of Tat.
- When transcription was activated by PMA/ionomycin without Tat, Cdk9 turned over rapidly, residing on the HIV-1 promoter for only 11 seconds.
- The dynamic properties of P-TEFb depend on its mode of recruitment to the HIV-1 promoter.
Takeaway
This study looks at how a protein complex helps HIV-1 make copies of itself, showing that the way it works changes depending on how it's activated.
Methodology
FRAP experiments were performed to analyze the dynamics of the TAR:Tat:P-TEFb complex in living cells.
Digital Object Identifier (DOI)
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