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Secondary structures and starvation-induced frameshifting

J Atkinson1, M Dodge, J Gallant

  • 1Department of Genetics, University of Washington, Seattle 98195-7360, USA.

Molecular Microbiology
|January 14, 1998
PubMed
Summary
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A downstream stem-loop structure significantly enhances programmed ribosomal frameshifting during isoleucine-tRNA limitation, increasing the effect fourfold. This effect is distance-dependent and sequence-independent.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Programmed ribosomal frameshifting is a mechanism for gene expression regulation.
  • RNA secondary structures downstream of slippery sites can influence frameshifting efficiency.
  • Isoleucine-tRNA limitation has been shown to induce frameshifting at specific bacterial sites.

Purpose of the Study:

  • To investigate the role of a downstream stem-loop structure in modulating frameshifting at a bacterial shifty site.
  • To determine the effect of isoleucine-tRNA limitation on frameshifting in the presence of this secondary structure.
  • To analyze the impact of distance and sequence of the stem-loop on frameshifting efficiency.

Main Methods:

  • Utilized a bacterial frameshifting reporter system.

Related Experiment Videos

  • Induced isoleucine-tRNA limitation through specific growth conditions.
  • Varied the distance and sequence of the downstream stem-loop structure.
  • Quantified frameshifting efficiency using reporter gene assays.

    • Main Results:

    • The downstream stem-loop had minimal impact on frameshifting in non-starved cells.
    • The stem-loop increased frameshifting under isoleucine-tRNA limitation approximately fourfold.
    • Maximal synergistic effect was observed when the stem-loop was 5-9 nucleotides downstream of the 'hungry' AUA codon.
    • A stem-loop with a different sequence at the same position yielded similar results.

    Conclusions:

    • Downstream stem-loop structures play a crucial role in amplifying frameshifting responses to specific tRNA limitations.
    • The synergistic effect is dependent on the proximity and structural presence of the stem-loop, not its specific sequence.
    • This finding provides insights into the regulatory mechanisms of gene expression via programmed ribosomal frameshifting.