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Related Experiment Videos

Upstream stimulators for recoding

B Larsen1, J Peden, S Matsufuji

  • 1Department of Human Genetics, University of Utah, Salt Lake City 84112, USA.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|November 1, 1995
PubMed
Summary
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The 5' Shine-Dalgarno sequence enhances translational frameshifting in genes, with optimal spacing critical for both +1 and -1 shifts. This mechanism is vital in bacterial and mammalian systems, including gene 60 bypass in bacteriophage T4.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Translational recoding involves deviations from standard gene expression.
  • Specific mRNA sequences and structures influence translation fidelity and efficiency.
  • Frameshifting, a type of translational recoding, alters the reading frame during protein synthesis.

Purpose of the Study:

  • To review recent advancements in understanding 5' stimulatory elements for translational recoding.
  • To highlight the role of the Shine-Dalgarno sequence in frameshift efficiency.
  • To examine frameshifting mechanisms in bacterial and mammalian genes.

Main Methods:

  • Review of existing literature on translational recoding and frameshifting.
  • Analysis of specific gene examples (E. coli prfB, dnaX, mammalian ornithine decarboxylase antizyme, bacteriophage T4 gene 60).

Related Experiment Videos

  • Examination of the impact of 5' sequences and spacing on frameshift efficiency.

    • Main Results:

    • The 5' Shine-Dalgarno sequence significantly increases both +1 and -1 frameshift efficiency in bacterial genes.
    • Optimal spacing between the Shine-Dalgarno sequence and the frameshift site differs for +1 and -1 shifts.
    • 5' sequences are crucial for frameshifting in mammalian genes (ornithine decarboxylase antizyme) and a bypass mechanism in bacteriophage T4 gene 60.

    Conclusions:

    • The Shine-Dalgarno sequence is a key stimulatory element for translational frameshifting.
    • Precise sequence spacing is critical for efficient frameshifting.
    • Frameshifting mechanisms involving 5' elements are conserved and important across different organisms.