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DNA origami-based single-molecule force spectroscopy elucidates RNA Polymerase III pre-initiation complex stability
Kevin Kramm1, Tim Schröder2, Jerome Gouge3
1Single-Molecule Biochemistry Lab, Institute of Microbiology and Archaea Centre, University of Regensburg, 93053, Regensburg, Germany.
Nature Communications
|June 7, 2020
Summary
The study reveals how DNA strain affects transcription initiation. Bdp1 is crucial for stabilizing RNA polymerase III (RNAP III) initiation complexes on strained DNA, explaining RNAP III
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- TATA-binding protein (TBP) and transcription factor (TF) IIB are key in eukaryotic transcription initiation.
- The specific role of the initiation factor Bdp1 in the RNA polymerase (RNAP) III system has been unclear.
- The impact of DNA strain on initiation complex formation is not well understood.
Purpose of the Study:
- To investigate the role of DNA strain in transcription initiation complex assembly.
- To elucidate the function of the initiation factor Bdp1 in the RNAP III system.
- To compare initiation complex formation in RNAP II and RNAP III systems under force.
Main Methods:
- Utilized a DNA origami-based force clamp technique.
- Analyzed single-molecule assembly of human initiation complexes.
- Applied piconewton forces to study TBP-DNA and TFIIB interactions.
Main Results:
- TBP-DNA complexes exhibit force sensitivity.
- TFIIB stabilizes TBP on strained promoters for RNAP II.
- Bdp1 is essential for stable initiation complex anchoring in the RNAP III system.
Conclusions:
- Bdp1's critical role explains the high transcriptional output of RNAP III.
- DNA strain significantly influences transcription initiation factor stability.
- The findings provide insights into differential regulation between RNAP II and RNAP III.
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