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Dynamic Membrane Localization of RNase Y in Bacillus subtilis
Lina Hamouche1, Cyrille Billaudeau2, Anna Rocca1
1UMR 8261, CNRS, Université de Paris, Institut de Biologie Physico-Chimique, Paris, France.
Mbio
|February 20, 2020
Summary
RNase Y in Bacillus subtilis rapidly moves along the cell membrane in dynamic foci. Its activity is regulated by the Y-complex, influencing mRNA decay and gene expression adaptation.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- mRNA metabolic turnover is crucial for gene expression control in prokaryotes.
- RNase Y initiates global mRNA decay in Bacillus subtilis via membrane-associated endonucleolytic cleavage.
- Understanding RNase Y's distribution and dynamics is key to bacterial adaptation.
Purpose of the Study:
- To visualize and analyze the distribution and dynamics of RNase Y in living Bacillus subtilis cells.
- To investigate the role of RNA substrates and the Y-complex in RNase Y foci formation and activity.
- To compare RNase Y dynamics with RNase E in Escherichia coli.
Main Methods:
- Total internal reflection fluorescence microscopy (TIRFm).
- Single-particle tracking (SPT) of RNase Y in living bacterial cells.
- Analysis of RNase Y foci formation under transcription arrest and in Y-complex mutants.
Main Results:
- RNase Y forms dynamic, short-lived foci that diffuse rapidly at the inner cell membrane.
- Foci formation is independent of RNA substrates, unlike RNase E.
- Transcription arrest increases RNase Y foci abundance and size, suggesting these are less active forms.
- Y-complex mutations significantly increase RNase Y foci, indicating a role in regulating RNase Y assembly and activity.
Conclusions:
- RNase Y exhibits distinct membrane dynamics and regulation compared to E. coli's RNase E.
- The Y-complex modulates RNase Y assembly, potentially enhancing the cleavage of complex mRNA substrates.
- These findings reveal fundamental differences in mRNA decay machinery between bacterial species.
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