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Related Experiment Video

Updated: Mar 16, 2026

A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1
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Coupling between the DEAD-box RNA helicases Ded1p and eIF4A.

Zhaofeng Gao1,2,3, Andrea A Putnam1,2,3, Heath A Bowers1,2,3

  • 1Center for RNA Molecular Biology, Case Western Reserve University, Cleveland, United States.

Elife
|August 6, 2016
PubMed
Summary
This summary is machine-generated.

The study reveals that yeast translation initiation factors eIF4A and Ded1p interact with each other and eIF4G. This reveals an interdependence, suggesting Ded1p is part of the eIF4F complex.

Keywords:
RNAS. cerevisiaebiochemistryhelicasenonetranslation

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Biology

Background:

  • Eukaryotic translation initiation is a complex process.
  • DEAD-box RNA helicases, eIF4A and Ded1p, are crucial for this process.
  • Their precise roles and interactions are not fully elucidated.

Purpose of the Study:

  • To investigate the direct interactions between S. cerevisiae eIF4A, Ded1p, and eIF4G.
  • To establish a thermodynamic framework for the interactions involving these proteins, RNA, and ATP.
  • To characterize the functional interdependence between these key translation factors.

Main Methods:

  • Co-immunoprecipitation assays to confirm protein-protein interactions.
  • Isothermal titration calorimetry (ITC) to determine thermodynamic parameters of binding.
  • RNA binding assays to assess substrate preferences and modulation.
  • Enzyme kinetics to analyze helicase activity.

Main Results:

  • S. cerevisiae eIF4A and Ded1p directly interact with each other.
  • Both helicases simultaneously bind to the scaffolding protein eIF4G.
  • A comprehensive thermodynamic framework reveals eIF4A modulates Ded1p activity and substrate specificity.
  • Ded1p functions as the primary RNA remodeling unit within the investigated complexes.
  • An unexpected interdependence between eIF4A, Ded1p, and eIF4G was characterized.

Conclusions:

  • Ded1p is an integral component of the eIF4F complex, alongside eIF4A, eIF4G, and eIF4E.
  • The interaction network suggests a coordinated mechanism for translation initiation.
  • eIF4A acts as a regulatory modulator for the RNA helicase Ded1p.