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Regulatory targets in the RNA polymerase II holoenzyme
1Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, 20 Shattuck Street, Boston, Massachusetts 02115, USA. jparvin@rics.bwh.harvard.edu
Abstract:
The RNA polymerase II holoenzyme is the form of polymerase recruited to promoters for protein-coding genes. Several targets of mammalian activators, previously called coactivators, turn out to be subunits of the holoenzyme which activators use to recruit and regulate the holoenzyme. Several of these newly identified holoenzyme components have been implicated in human disease.
Insights
Mammalian activators recruit RNA polymerase II holoenzyme to genes. Previously known coactivators are now identified as holoenzyme subunits, some linked to human diseases.
Area of Science:
- Molecular Biology
- Gene Regulation
- Biochemistry
Background:
- RNA polymerase II holoenzyme is crucial for transcribing protein-coding genes.
- Mammalian activators interact with transcription machinery to regulate gene expression.
- The precise role of coactivators in holoenzyme recruitment and regulation was unclear.
Purpose of the Study:
- To identify the molecular targets of mammalian activators.
- To elucidate the composition and function of the RNA polymerase II holoenzyme.
- To investigate the link between holoenzyme components and human diseases.
Main Methods:
- Biochemical assays to identify protein-protein interactions.
- Analysis of holoenzyme composition.
- Genetic and cellular studies to assess functional roles.
Main Results:
- Several mammalian activator targets are integral subunits of the RNA polymerase II holoenzyme.
- These subunits mediate the recruitment and regulation of the holoenzyme by activators.
- Newly identified holoenzyme components have been linked to various human diseases.
Conclusions:
- Activators utilize specific holoenzyme subunits to control gene transcription.
- The RNA polymerase II holoenzyme is a key regulatory complex with implications for human health.
- Understanding holoenzyme composition offers insights into disease mechanisms.