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A dynamic compositional equilibrium governs mRNA recognition by eIF3.

Nicholas A Ide1, Riley C Gentry1, Margaret A Rudbach2

  • 1Department of Biological Sciences, Columbia University, New York, NY, USA.

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|May 7, 2024
PubMed
Summary
This summary is machine-generated.

Eukaryotic translation initiation factor 3 (eIF3) dynamically exchanges between different forms. The eIF3a subunit, not the full complex, drives mRNA binding, revealing a new model for translation initiation.

Keywords:
TranslationbiochemistrybiophysicseIF3mRNAmRNA recruitmentmass photometryribosomesingle-moleculetranslation initiationtranslational regulation

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Eukaryotic translation initiation factor 3 (eIF3) is a crucial multi-subunit complex regulating protein synthesis.
  • A comprehensive understanding of how eIF3 orchestrates its diverse functions in translation initiation is lacking.
  • eIF3 interacts with ribosomes and messenger RNAs (mRNAs) to facilitate translation.

Purpose of the Study:

  • To elucidate the dynamic nature and compositional equilibrium of the eIF3 complex.
  • To identify the specific eIF3 subspecies responsible for mRNA binding.
  • To establish a mechanistic framework for eIF3's role in translation initiation.

Main Methods:

  • Single-molecule light scattering microscopy was employed to study eIF3 dynamics in yeast.
  • An in vitro reconstituted eIF3 system was utilized for further investigation.
  • Biochemical assays were performed to complement microscopy findings.

Main Results:

  • Saccharomyces cerevisiae eIF3 exists in dynamic exchange between its full complex, subcomplexes, and individual subunits.
  • mRNA binding is mediated by the eIF3a subunit within specific eIF3a-containing subcomplexes, not the entire eIF3 complex.
  • The study defined the subspecies involved in the dynamic compositional equilibrium of eIF3.

Conclusions:

  • The findings present a mechanistic model for eIF3's function in mRNA recruitment during translation.
  • This work establishes a foundational framework for investigating the multifaceted activities of eIF3.
  • Understanding eIF3 dynamics is key to comprehending translation regulation.