Nucleosome sliding via TBP DNA binding in vivo
- PMID: 11572775
- DOI: 10.1016/s0092-8674(01)00490-1
Nucleosome sliding via TBP DNA binding in vivo
Abstract
Here, we show that a nucleosome obstructing transcription from the IFN-beta promoter slides in vivo in response to virus infection, thus exposing the previously masked TATA box and the initiation site, a requirement for transcriptional activation. Our experiments also revealed that this mode of chromatin remodeling is a two-step reaction. First, the enhanceosome recruits the SWI/SNF chromatin-remodeling complex that modifies the nucleosome to allow binding of TBP. Second, DNA bending is induced by TBP binding, and the nucleosome slides to a new position. Experiments with other DNA binding proteins demonstrated a strong correlation between the ability to bend DNA and nucleosome sliding, suggesting that the sliding is induced by the bend.
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