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Related Experiment Video

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Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells

Published on: May 1, 2020

A cellular response linking eIF4AI activity to eIF4AII transcription.

Gabriela Galicia-Vázquez¹, Regina Cencic, Francis Robert

¹Department of Biochemistry, McGill University, Montreal, Quebec H3G1Y6, Canada.

RNA (New York, N.Y.)

|May 17, 2012

Summary

Suppression of eukaryotic initiation factor (eIF) 4AI increases eIF4AII levels, but does not restore protein synthesis or cell proliferation, indicating functional differences between these RNA helicase isoforms.

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Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

Ribosome recruitment to mRNA requires RNA helicases eukaryotic initiation factor (eIF) 4AI and eIF4AII.
These eIF4A isoforms assemble into the eIF4F complex, aiding translation initiation at the mRNA 5' cap.
They are considered highly conserved and functionally interchangeable.

Purpose of the Study:

Investigate the distinct roles of eIF4AI and eIF4AII in mRNA translation.
Uncover the cellular response to the suppression of eIF4AI.
Determine if eIF4AII can compensate for the loss of eIF4AI function.

Main Methods:

RNA interference (RNAi) to suppress eIF4AI expression.
Quantitative analysis of eIF4AII mRNA and protein levels.
Assessment of protein synthesis and cellular proliferation.
Treatment with the small molecule eIF4A inhibitor, hippuristanol.

Main Results:

Suppression of eIF4AI triggered a compensatory increase in eIF4AII gene transcription, mRNA, and protein levels.
Despite elevated eIF4AII, protein synthesis and cell proliferation remained inhibited.
Inhibition of eIF4AI with hippuristanol mimicked these effects.

Conclusions:

eIF4AI and eIF4AII expression are linked through a cellular response pathway.
The two eIF4A isoforms exhibit distinct functional roles in translation and cell proliferation.
eIF4AII cannot fully compensate for the loss of eIF4AI activity.