CTDP1 and RPB7 stabilize Pol II and permit reinitiation.
Haonan Zheng1, Qiqin Xu1, Dexun Ji1
1State Key Laboratory of Gene Function and Modulation Research, Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, Beijing Advanced Center of RNA Biology (BEACON), School of Life Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China.
Nature Communications
|March 4, 2025
Summary
RPB7 depletion destabilizes RNA polymerase II (Pol II) subunit RPB1. RPB7 recruits phosphatase CTDP1 to stabilize Pol II, crucial for transcription reinitiation and RNA processing.
Area of Science:
- Molecular Biology
- Gene Expression
- Biochemistry
Background:
- The mechanisms of RNA polymerase II (Pol II) termination and reinitiation are not fully understood.
- Understanding these processes is critical for regulating gene expression.
Purpose of the Study:
- To investigate the role of RPB7 in the stability and reinitiation of RNA polymerase II.
- To elucidate the molecular mechanisms underlying Pol II regulation by RPB7.
Main Methods:
- Depletion of RPB7 using genetic manipulation.
- Analysis of RPB1 subunit stability.
- Investigating protein-protein interactions involving RPB7, CDK9, CTDP1, and Cullin 3.
- Assessing RNA processing efficiency.
Main Results:
- RPB7 depletion destabilizes the RPB1 subunit of Pol II.
- RPB1 destabilization is influenced by RPB7 loop regions, CDK9, and RPB1's CTD and linker regions.
- The E3 ubiquitin ligase Cullin 3 regulates RPB1 stabilization.
- RPB7 interacts with phosphatase CTDP1, essential for RPB1 stability.
- RPB7 is vital for Pol II reinitiation and RNA processing, localizing to the Pol II RNA exit channel.
Conclusions:
- RPB7 plays a critical role in maintaining Pol II stability and facilitating transcription reinitiation.
- RPB7 likely recruits CTDP1 to dephosphorylate Pol II, enhancing its stability and promoting efficient reinitiation.
- These findings reveal a novel mechanism in transcriptional regulation involving RPB7 and CTDP1.
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