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Related Experiment Videos

The cap and poly(A) tail function synergistically to regulate mRNA translational efficiency.

D R Gallie1

  • 1Department of Biochemistry, University of California, Riverside 92521.

Genes & Development
|November 1, 1991
PubMed
Summary
This summary is machine-generated.

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The messenger RNA cap and poly(A) tail are crucial for translation efficiency. Their functions are interdependent in vivo, requiring both for optimal protein synthesis.

Area of Science:

  • Molecular Biology
  • Gene Expression Regulation

Background:

  • Messenger RNA (mRNA) translation efficiency is regulated by specific structural elements.
  • The 5' cap structure and the 3' poly(A) tail are known determinants of mRNA translation.
  • The precise mechanisms and interplay between the cap and poly(A) tail remain incompletely understood.

Purpose of the Study:

  • To investigate the functional interdependence of the mRNA cap and poly(A) tail in regulating translation.
  • To determine if the poly(A) tail requires the cap for its regulatory function in translation.
  • To assess the synergistic effect of the cap and poly(A) tail on translation efficiency.

Main Methods:

  • In vitro transcribed luciferase (Luc) mRNAs, with and without a cap, and with or without a poly(A) tail, were generated.

Related Experiment Videos

  • These mRNAs were delivered into various cell types (tobacco protoplasts, Chinese hamster ovary cells, yeast) via electroporation for in vivo translation assays.
  • Translation efficiency was measured, and experiments were conducted in disrupted translation systems (yeast with inhibited translation, in vitro lysates) to control for specific interactions.

    • Main Results:

    • Poly(A) tail-mediated translational regulation was entirely dependent on the presence of the 5' cap.
    • The cap structure's function was significantly enhanced (over tenfold) by the presence of a poly(A) tail.
    • This synergistic enhancement of translation was not attributable to differences in mRNA stability and was abolished in yeast cells with disrupted translation or in vitro translation lysates.

    Conclusions:

    • The mRNA cap and poly(A) tail are mutually dependent for optimal translational function in living cells (in vivo).
    • These findings suggest a critical communication pathway between the 5' cap and the 3' poly(A) tail is essential for efficient translation initiation and elongation.
    • This interdependence highlights a complex regulatory network governing gene expression at the translational level.