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Nonsense codons within the Rous sarcoma virus gag gene decrease the stability of unspliced viral RNA.

G F Barker1, K Beemon

  • 1Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218.

Molecular and Cellular Biology
|May 1, 1991
PubMed
Summary
This summary is machine-generated.

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Premature termination of Rous sarcoma virus gag gene translation destabilizes unspliced viral RNA. This RNA degradation is linked to translation disruption, not gag protein function, impacting viral replication.

Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Rous sarcoma virus (RSV) replication involves complex RNA processing and translation.
  • The gag gene is crucial for viral structural protein synthesis and RNA packaging.

Purpose of the Study:

  • To investigate the impact of premature translation termination on unspliced viral RNA stability.
  • To elucidate the role of gag gene translation in regulating viral RNA stability.

Main Methods:

  • Transient expression assays in chicken cells.
  • Introduction of nonsense codons into the RSV gag gene.
  • Use of transcription inhibitor dactinomycin.
  • Analysis of RNA levels and stability through coexpression experiments.

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Main Results:

  • Premature termination codons in the gag gene decreased intracellular accumulation of unspliced viral RNA.
  • Spliced viral RNA levels remained unaffected by nonsense codon introduction.
  • Mutant unspliced RNAs exhibited more rapid degradation compared to wild-type RNA.
  • Coexpression of wild-type gag proteins partially stabilized mutant RNAs, but intact proteins were not required for RNA stability without premature termination codons.

Conclusions:

  • Premature termination codons destabilize unspliced viral RNA by disrupting gag gene translation, not by affecting gag protein function.
  • A cis-acting interaction between the RNA and ribosomes during gag translation influences unspliced RNA stability.