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Regulatory roles for small RNAs in bacteria
Eric Massé1, Nadim Majdalani, Susan Gottesman
1Laboratory of Molecular Biology, National Cancer Institute, Bethesda, MD 20892, USA.
Current Opinion in Microbiology
|May 7, 2003
Summary
Small RNAs regulate protein synthesis and activity in Escherichia coli. Around 50 small RNAs have been identified, many requiring the Hfq protein and targeting mRNAs for regulation.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Small RNAs (sRNAs) are crucial regulators of gene expression.
- In Escherichia coli, sRNAs influence protein synthesis and activity.
- Genome-wide screens have identified approximately 50 sRNAs in E. coli.
Purpose of the Study:
- To summarize the regulatory roles and characteristics of small RNAs in Escherichia coli.
- To highlight the involvement of the RNA-binding protein Hfq in sRNA activity.
- To describe the diverse mechanisms by which sRNAs modulate gene expression.
Main Methods:
- Review of recent genome-wide screening data.
- Analysis of literature on small RNA function in Escherichia coli.
- Characterization of RNA-binding protein Hfq-dependent sRNAs.
Main Results:
- Approximately 50 small RNAs identified in Escherichia coli.
- Many identified sRNAs depend on the Hfq protein for their function.
- Most Hfq-dependent sRNAs function by base-pairing with target mRNAs.
- Small RNAs exhibit diverse regulatory functions, including positive and negative translational control.
- sRNAs can target multiple mRNAs simultaneously and affect operon polarity.
Conclusions:
- Small RNAs are versatile regulators of gene expression in Escherichia coli.
- The Hfq protein is essential for the activity of a significant subset of bacterial sRNAs.
- sRNA-mediated regulation impacts translation, mRNA stability, and operon organization.