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RNA polymerase trafficking in Bacillus subtilis cells.
Shu Ishikawa1, Taku Oshima, Ken Kurokawa
1Graduate School of Information Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara 630-0192, Japan.
Journal of Bacteriology
|September 7, 2010
Summary
Bacillus subtilis RNA polymerase (RNAP) distributes evenly across genes, unlike E. coli RNAP. This suggests B. subtilis primarily uses transcription attenuation for gene regulation, differing from E. coli’s promoter-proximal pausing.
Area of Science:
- Microbiology
- Molecular Biology
- Genomics
Background:
- Understanding in vivo RNA polymerase (RNAP) dynamics is crucial for deciphering gene regulation.
- Escherichia coli RNAP exhibits promoter-proximal accumulation, suggesting specific regulatory mechanisms.
Purpose of the Study:
- To investigate the genome-wide distribution and dynamics of RNAP subunits (σ(A), β') and NusA in Bacillus subtilis.
- To compare RNAP behavior in B. subtilis with that of E. coli to understand differences in transcription regulation.
Main Methods:
- Chromatin affinity precipitation coupled with gene chip mapping (ChAP-chip) was employed.
- Analysis focused on exponentially growing B. subtilis cells to capture active transcription dynamics.
Main Results:
- Unlike E. coli, B. subtilis RNAP showed even distribution from promoter to coding sequences.
- RNAP accumulation was observed at promoter-proximal regions of specific genes, often linked to transcription attenuation systems.
- This suggests B. subtilis RNAP efficiently translocates to elongation without significant promoter-proximal pausing.
Conclusions:
- B. subtilis RNAP exhibits distinct in vivo dynamics compared to E. coli, favoring rapid translocation post-initiation.
- The primary mechanism for post-initiation transcription control in B. subtilis appears to be transcription attenuation in leader sequences.
- Differences in RNAP behavior highlight distinct strategies for transcriptional regulation between these bacterial species.
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