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Bacterial Artificial Chromosomes: A Functional Genomics Tool for the Study of Positive-strand RNA Viruses
Published on: December 29, 2015
Long-range architecture in a viral RNA genome
Eva J Archer1, Mark A Simpson, Nicholas J Watts
1Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, USA.
Biochemistry
|April 26, 2013
Summary
Researchers modeled the satellite tobacco mosaic virus (STMV) RNA genome, revealing a complex three-domain structure essential for viral functions like replication and translation. This higher-order RNA structure is key to the virus
Area of Science:
- Virology
- Structural Biology
- RNA Biology
Background:
- Satellite tobacco mosaic virus (STMV) is an icosahedral plant virus with a single-stranded RNA genome.
- Understanding the higher-order structure of viral RNA is crucial for deciphering viral replication and assembly mechanisms.
Purpose of the Study:
- To develop a high-resolution model of the STMV RNA genome's secondary structure.
- To investigate the relationship between RNA structure and viral function.
Main Methods:
- Nucleotide-resolution SHAPE chemical probing of viral RNA (in vitro and in virion).
- Perturbation of long-range RNA interactions.
- Atomic force microscopy (AFM).
Main Results:
- A three-domain genome architecture for the STMV RNA was elucidated.
- Long-range base-pairing interactions were identified, contributing to a compact structure (10-45 nm domains).
- Each domain correlates with specific functions: central (capsid protein coding), 5' UTR (translation), and 3' UTR (replication).
Conclusions:
- The STMV RNA genome possesses a complex higher-order structure despite the virus' simplicity.
- This three-domain architecture supports functional roles in translation, replication, and protein interactions.
- A strong evolutionary link exists between RNA domain structure and essential viral functions.
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