Differential regulation of RNA polymerases I, II, and III by the TBP-binding repressor Dr1.
basic_science · Level V
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Abstract
RNA polymerases I, II, and III each use the TATA-binding protein (TBP). Regulators that target this shared factor may therefore provide a means to coordinate the activities of the three nuclear RNA polymerases. The repressor Dr1 binds to TBP and blocks the interaction of TBP with polymerase II- and polymerase III-specific factors. This enables Dr1 to coordinately regulate transcription by RNA polymerases II and III. Under the same conditions, Dr1 does not inhibit polymerase I transcription. By selectively repressing polymerases II and III, Dr1 may shift the physiological balance of transcriptional output in favor of polymerase I.
Medical subject headings
- Phosphoproteins
- RNA Polymerase I
- RNA Polymerase II
- RNA Polymerase III
- Transcription Factors
- Transcription Factors, TFIII
- Transcription, Genetic