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Isolation of mRNAs Associated with Yeast Mitochondria to Study Mechanisms of Localized Translation
14:44

Isolation of mRNAs Associated with Yeast Mitochondria to Study Mechanisms of Localized Translation

Published on: March 14, 2014

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mRNA localization to P-bodies in yeast is bi-phasic with many mRNAs captured in a late Bfr1p-dependent wave

Clare E Simpson1, Jennifer Lui, Christopher J Kershaw

  • 1Department of Biochemistry, Downing Site, The University of Cambridge, Cambridge CB2 1QW, UK.

Journal of Cell Science
|January 16, 2014
PubMed

Insights

Cellular stress causes mRNA to move to processing bodies (Pbodies) in a two-phase process. Specific proteins like Bfr1p influence the timing of mRNA recruitment, revealing new gene regulation insights.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Messenger RNA (mRNA) relocalization to mRNA processing bodies (Pbodies) is a critical response to cellular stress.
  • Pbodies contain mRNA degradation machinery, but the precise timing and regulation of mRNA recruitment remain unclear.

Purpose of the Study:

  • To investigate the kinetics and regulatory mechanisms of endogenous mRNA relocalization to Pbodies in Saccharomyces cerevisiae under nutritional stress.
  • To identify factors influencing the differential recruitment of mRNAs to Pbodies.

Main Methods:

  • Utilized the MS2GFP system for live-cell imaging of specific endogenous mRNA movements.
  • Analyzed mRNA localization dynamics in yeast cells subjected to nutritional stress.

Main Results:

  • mRNA relocalization to Pbodies occurs in a biphasic manner: some mRNAs are recruited early, while others are recruited later.
  • Late-phase recruitment of certain mRNAs coincides with the arrival of translation initiation factors like eIF4E.
  • The protein Bfr1p was identified as a late-phase Pbody component crucial for the delayed entry of specific mRNAs.

Conclusions:

  • mRNA recruitment to Pbodies exhibits variable kinetics and factor dependencies.
  • This differential regulation suggests a novel control point in gene expression for cellular adaptation to stress.
Keywords:
Glucose regulationPbodiesStress granulesYeastmRNA localization

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