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Related Experiment Videos

Identification of a cis-acting replication element within the poliovirus coding region.

I Goodfellow1, Y Chaudhry, A Richardson

  • 1Division of Virology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, United Kingdom.

Journal of Virology
|April 25, 2000
PubMed
Summary

Researchers identified a novel RNA secondary structure in poliovirus essential for replication. This structure acts as a cis-acting replication element (CRE), crucial for synthesizing the negative-strand template required for viral genome copying.

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Area of Science:

  • Virology
  • Molecular Biology
  • RNA Biology

Background:

  • Poliovirus, a positive-stranded RNA virus, requires specific RNA sequences for replication.
  • The synthesis of the negative-stranded RNA template is a critical step.
  • RNA secondary structures are known to play roles in picornavirus replication.

Purpose of the Study:

  • To identify and characterize novel cis-acting replication elements (CREs) in the poliovirus genome.
  • To investigate the role of RNA secondary structures in poliovirus replication.

Main Methods:

  • Bioinformatic prediction of local RNA secondary structures within the poliovirus genome.
  • Site-directed mutagenesis to disrupt predicted stem-loop structures.
  • Analysis of viral genome viability and replication kinetics.

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  • Reversion analysis to assess the importance of structural integrity.
  • Subgenomic replicon assays to confirm functional activity.

    • Main Results:

    • A conserved 61-nucleotide stem-loop structure was identified in the 2C protein-coding region.
    • Disruption of this stem-loop abolished poliovirus genome viability and negative-strand synthesis.
    • Mutations were critical for function in the positive sense, and structural integrity was essential.
    • Replication competence was restored in subgenomic replicons by adding a second copy of the wild-type sequence.

    Conclusions:

    • A novel poliovirus cis-acting replication element (CRE) has been identified, comprising an RNA secondary structure.
    • This CRE is essential for the synthesis of the negative-strand template during viral replication.
    • The identified poliovirus CRE shares functional similarities but differs in sequence, structure, and location from elements in other picornaviruses.