The mechanisms of transcription repression and derepression in vivo are not fully understood. We have obtained evidence that begins to clarify the minimum requirements for counteracting nucleosomal repression in vivo. Location of the TATA element near the nucleosome dyad does not block RNA polymerase II transcription in vivo if there is a nucleosome-free region located immediately upstream. However, location of the TATA element similarly within the nucleosome does block transcription if the region upstream of it is nucleosome bound. Histone H4 depletion derepresses transcription in the latter case, supporting the idea that the nucleosomes are responsible for the repression. These results raise the intriguing possibility that the minimum requirement for derepression of transcription in vivo is a nucleosome-free region upstream of the core promoter. Importantly, we find that a C-terminal deletion in RGR1, a component of the mediator/holoenzyme complex and a global repressor, can also derepress transcription.
|Evidence ID||Analyze ID||Interactor||Interactor Systematic Name||Interactor||Interactor Systematic Name||Type||Assay||Annotation||Action||Modification||Phenotype||Source||Reference||Note|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Gene Ontology Term||Gene Ontology Term ID||Qualifier||Aspect||Method||Evidence||Source||Assigned On||Reference||Annotation Extension|
|Evidence ID||Analyze ID||Gene||Gene Systematic Name||Phenotype||Experiment Type||Experiment Type Category||Mutant Information||Strain Background||Chemical||Details||Reference|
|Evidence ID||Analyze ID||Regulator||Regulator Systematic Name||Target||Target Systematic Name||Experiment||Conditions||Strain||Source||Reference|