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Coupling between genome translation and replication in an RNA virus
1Department of Molecular, Cellular, and Developmental Biology, Howard Hughes Medical Institute, University of Colorado, Boulder 80309.
Genes & Development
|July 15, 1994
Summary
Viral proteins can rescue poliovirus RNA replication when translation is incomplete. A specific RNA region requires cis-translation for replication, acting as a proofreading mechanism against defective genomes.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Poliovirus RNA replication is essential for viral propagation.
- Understanding the interplay between viral translation and RNA replication is crucial for viral control.
Purpose of the Study:
- To investigate if viral proteins supplied in trans can rescue poliovirus RNA replication with incomplete translation.
- To identify cis-acting elements required for poliovirus RNA replication.
- To explore the role of translation-replication coupling in preventing defective genome replication.
Main Methods:
- Utilized poliovirus RNA genomes with amber mutations at various positions.
- Employed amber-suppressing cell lines to differentiate translation defects from RNA sequence/structure issues.
- Assessed the rescue of mutant RNA replication by wild-type proteins provided in trans via a helper genome.
Main Results:
- Amber mutants showed varied rescue efficiencies depending on mutation location.
- An internal viral RNA region was identified as essential for cis-translation to support RNA replication.
- Failure to translate this specific region significantly inhibited RNA replication.
Conclusions:
- Poliovirus RNA replication is tightly coupled to the translation of specific viral genomic regions.
- This translation-replication coupling may function as a late proofreading mechanism.
- This mechanism could prevent the replication of defective poliovirus genomes and potentially other RNA viruses.