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Sm-like protein Hfq: Composition of the native complex, modifications, and interactions
Karla A Obregon1, Connor T Hoch1, Maxim V Sukhodolets1
1Department of Chemistry and Biochemistry, Lamar University, Beaumont, TX 77710, USA.
Biochimica Et Biophysica Acta
|April 22, 2015
Summary
The bacterial Hfq protein, crucial for RNA regulation, may act as a cellular anchor. It links RNA processing and degradation machinery, influencing RNA stability and localization within Escherichia coli.
Area of Science:
- Bacteriology
- Molecular Biology
- Biochemistry
Background:
- The Sm-like protein Hfq is known to interact with RNA in bacteria.
- Its precise function and cellular location have remained unclear.
Purpose of the Study:
- To biochemically characterize native Escherichia coli Hfq.
- To elucidate the role and localization of Hfq in RNA metabolism.
Main Methods:
- Electrospray ionization mass spectrometry (ESI-MS) for analyzing posttranslational modifications.
- Biochemical extraction and hydrophobic matrix retention assays.
- Analysis of Hfq complexes in whole-cell extracts.
Main Results:
- Hfq exhibits posttranslational modifications, including lipid oxidation.
- Cellular Hfq is largely insoluble and associates with hydrophobic matrices.
- Hfq forms dodecameric assemblies, potentially stabilized by C-terminal interactions and nucleic acids.
- Hfq localizes to both transcription complexes and an insoluble fraction containing the degradosome (PNP).
Conclusions:
- Hfq functions at the interface of RNA synthesis and degradation.
- Hfq may act as a coupling factor, de-solubilizing RNA and tethering it to the degradosome complex.
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