How HIV-1 Tat Affects Transcription with Chromatin Remodeling
Author Information
Author(s): Agbottah Emmanuel, Deng Longwen, Dannenberg Luke O, Pumfery Anne, Kashanchi Fatah
Primary Institution: The George Washington University Medical Center
Hypothesis
The study investigates the role of the SWI/SNF chromatin remodeling complex in HIV-1 Tat activated transcription.
Conclusion
The study shows that acetylated Tat recruits the SWI/SNF complex to the HIV-1 promoter, facilitating transcription initiation and elongation.
Supporting Evidence
- Acetylated Tat was shown to bind to BRG1, a component of the SWI/SNF complex.
- Transcription was maximally activated at the G1/S border of the cell cycle.
- BRG1 expression was critical for HIV-1 replication in infected cells.
- SWI/SNF and acetylated Tat together significantly increased transcriptional activity.
Takeaway
HIV-1 uses a special protein called Tat to help it make copies of itself, and this process is helped by another group of proteins that change the structure of DNA.
Methodology
The study used in vitro transcription assays, chromatin immunoprecipitation (ChIP), and mass spectrometry to analyze the interactions between Tat and chromatin remodeling complexes.
Digital Object Identifier (DOI)
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