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Updated: May 17, 2026
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Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Published on: May 13, 2019
RNA polymerase III subunit architecture and implications for open promoter complex formation
Chih-Chien Wu1, Franz Herzog, Stefan Jennebach
1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan 115, Republic of China.
Summary
The TFIIE-related C82/34/31 subcomplex is crucial for RNA polymerase III transcription initiation. Its winged helix domains bind the polymerase active center, aiding promoter DNA binding and stabilization.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- RNA polymerase III (Pol III) is essential for transcribing genes encoding small non-coding RNAs.
- Transcription initiation by Pol III depends on the TFIIE-related subcomplex C82/34/31.
- Understanding the structural role of C82/34/31 is key to elucidating Pol III function.
Purpose of the Study:
- To determine the precise localization of the C82/34/31 subcomplex within the RNA polymerase III active center.
- To elucidate the structural contribution of C82/34/31 to transcription initiation.
Main Methods:
- Cross-linking and hydroxyl radical probing were employed to map protein-DNA and protein-protein interactions.
- Structural data was integrated with existing knowledge of Pol III architecture.
Main Results:
- The C82/34/31 subcomplex localizes to the Pol III active center cleft.
- Specific winged helix (WH) domains of C82 and C34 were positioned on the polymerase clamp head, core, and protrusion.
- These WH domains cooperate with other polymerase regions during promoter DNA binding and opening.
Conclusions:
- The study completes the subunit architecture of Pol III.
- TFIIE-related components in eukaryotes and archaea share a conserved location and function in promoter complex formation.
- This conserved structure facilitates open promoter complex formation and stabilization.
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