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Biologically-supported structural model for a viral satellite RNA.
Peter Ashton1, Baodong Wu1, Jessica D'Angelo1
1Department of Biology, York University, Toronto, Ontario, M3J 1P3 Canada.
Nucleic Acids Research
|September 19, 2015
Summary
Satellite RNAs (satRNAs) are parasitic RNA replicons relying on helper viruses. This study reveals complex RNA structures, including an RNA switch, crucial for satRNA replication and accumulation.
Area of Science:
- Molecular Biology
- Virology
- RNA Biology
Background:
- Satellite RNAs (satRNAs) are small RNA replicons dependent on helper viruses for replication and packaging.
- SatRNAs utilize their RNA sequences and structures to recruit viral proteins and other factors.
Purpose of the Study:
- To investigate the biological importance of higher-order RNA structures in a tombusvirus satRNA.
- To identify functionally relevant secondary and tertiary structures within the satRNA.
Main Methods:
- Chemical probing analysis of RNA structure.
- Phylogenetic structural comparisons.
- Viability assays of satRNA mutants in infected cells.
Main Results:
- Identified functionally relevant secondary and tertiary RNA structures throughout the satRNA.
- Discovered a 3'-terminal RNA segment forming two mutually-exclusive structures, acting as an RNA switch.
- Demonstrated that both alternative conformations and a long-range kissing-loop interaction are essential for efficient satRNA accumulation.
Conclusions:
- Tombusvirus satRNAs exhibit significant conformational complexity.
- The identified RNA switch and its interactions are critical for satRNA replication and accumulation.
- These findings provide a structural framework for understanding satRNA-helper virus interactions.
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