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Transcription attenuation associated with bacterial repetitive extragenic BIME elements
O Espéli1, L Moulin, F Boccard
1Centre de Génétique Moléculaire du CNRS, Centre National de la Recherche Scientifique, Gif-sur-Yvette Cedex, F-91198, France.
Journal of Molecular Biology
|February 16, 2002
Summary
Researchers discovered a new transcription attenuation mechanism in Escherichia coli involving bacterial interspersed mosaic elements (BIMEs) and the Rho factor. This finding reveals BIMEs as global regulators impacting gene expression across numerous operons.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Transcription attenuation regulates gene expression by controlling transcript elongation and termination.
- Cells utilize attenuation to adjust protein synthesis in response to specific signals.
Purpose of the Study:
- To characterize a novel transcription attenuation mechanism in Escherichia coli.
- To investigate the role of bacterial interspersed mosaic elements (BIMEs) in gene regulation.
Main Methods:
- Utilized a tRNA gene as a transcriptional reporter.
- Performed mutational analyses to identify nucleotide determinants in BIMEs.
- Investigated the involvement of the transcription termination factor Rho.
Main Results:
- Identified a new BIME-dependent transcription attenuation mechanism requiring the Rho factor.
- Determined that BIMEs cause RNA polymerase pausing, leading to Rho-dependent termination.
- Showed that attenuation relies on sequence-specific nucleotide determinants within BIMEs.
Conclusions:
- Bacterial interspersed mosaic elements (BIMEs) function as Rho-dependent regulators of transcription attenuation.
- This mechanism can differentially regulate expression of genes within a single operon.
- The widespread dispersion of BIMEs suggests a significant role in genome-wide gene regulation.