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Related Experiment Videos

Suppression of translation frameshift by upstream termination codon

A Honda1, S Nishimura

  • 1Banyu Tsukuba Research Institute, Merck Research Laboratories, Ibarakgi, Japan. ayhonda@lab.nig.ac.jp.

Biochemical and Biophysical Research Communications
|April 25, 1996
PubMed
Summary

Retroviruses use programmed ribosomal frameshifting for gene expression. An upstream stop codon unexpectedly reduces this frameshifting, decreasing downstream gene production.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Retroviruses utilize programmed ribosomal frameshifting to express genes.
  • This process relies on specific mRNA sequences (slippery sites) and RNA structures (stem-loops, pseudoknots).
  • These elements typically enhance the efficiency of frameshifting.

Purpose of the Study:

  • To investigate the regulatory role of upstream elements on retroviral frameshifting.
  • To determine the impact of upstream termination codons on ribosomal frameshifting efficiency.
  • To understand how upstream sequences influence downstream gene expression in retroviruses.

Main Methods:

  • Analysis of mRNA sequences and secondary structures.
  • Reporter gene assays to measure frameshifting efficiency.

Related Experiment Videos

  • Mutagenesis studies to alter upstream sequences.

    • Main Results:

    • A downstream stem-loop structure enhances ribosomal frameshifting.
    • An upstream termination codon was found to suppress ribosomal frameshifting.
    • This suppression led to a significant reduction in the expression of downstream genes.

    Conclusions:

    • Upstream termination codons act as negative regulators of retroviral programmed ribosomal frameshifting.
    • This mechanism provides a novel way to control gene expression in retroviruses.
    • Understanding this regulation is crucial for developing antiviral strategies.