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Related Experiment Videos

The p46 subunit of eukaryotic initiation factor (eIF)-4F exchanges with eIF-4A

J Yoder-Hill1, A Pause, N Sonenberg

  • 1Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106.

The Journal of Biological Chemistry
|March 15, 1993
PubMed
Summary

The p46 subunit of eukaryotic initiation factor (eIF)-4F exchanges with free eIF-4A. This study demonstrates that both rabbit and mouse eIF-4A subunits can be incorporated into the eIF-4F complex, highlighting a dynamic exchange mechanism.

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Area of Science:

  • Molecular Biology
  • Protein Biochemistry
  • Cellular Biology

Background:

  • The eukaryotic initiation factor (eIF)-4F complex is crucial for cap-dependent translation initiation.
  • The p46 subunit of eIF-4F, typically composed of eIF-4AI and eIF-4AII, plays a key role in translation initiation.
  • Understanding the dynamic composition of eIF-4F is essential for elucidating translation regulation.

Purpose of the Study:

  • To investigate the exchange dynamics between the p46 subunit of eIF-4F and free eIF-4A.
  • To determine if different species of eIF-4A (rabbit and mouse) can incorporate into the eIF-4F complex.
  • To characterize the mechanism of eIF-4F complex assembly and turnover.

Main Methods:

  • Sucrose gradient centrifugation was employed to separate protein complexes.

Related Experiment Videos

  • An m7GTP-Sepharose 4B assay was used to assess nucleotide-binding protein interactions.
  • Radiolabeling ([14C]) of eIF-4A and eIF-4F subunits was utilized to track incorporation and dissociation.

    • Main Results:

    • The p46 subunit of purified eIF-4F was shown to exchange with free eIF-4A.
    • [14C]eIF-4A was incorporated into the eIF-4F complex upon incubation.
    • The p46 subunit of [14C]eIF-4F dissociated in the presence of unlabeled eIF-4A, indicating subunit exchange.
    • Both rabbit and mouse eIF-4AI and eIF-4AII expressed in E. coli could exchange with the p46 subunit of eIF-4F.

    Conclusions:

    • The p46 subunit of eIF-4F is not static and undergoes dynamic exchange with free eIF-4A.
    • This exchange mechanism involves both endogenous rabbit eIF-4A and heterologously expressed mouse eIF-4A subunits.
    • The findings provide insights into the assembly and regulation of the translation initiation factor eIF-4F complex.