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Translational control during heat shock
1National Institutes of Health, Bethesda, MD 20892, USA.
Biochimie
|January 1, 1994
Summary
Heat shock severely inhibits protein synthesis, but heat shock proteins (HSPs) are protected. This regulation occurs at the polypeptide chain initiation step, involving key initiation factors like eIF-2 and eIF-4F.
Area of Science:
- Molecular Biology
- Cellular Stress Response
Background:
- Elevated temperatures inhibit cellular protein synthesis.
- Synthesis of heat shock proteins (HSPs) remains resistant to thermal inhibition.
- Regulation of translation is crucial for cellular survival under stress.
Purpose of the Study:
- To review the regulation of translation during heat shock in Drosophila and mammalian cells.
- To elucidate the roles of initiation factors in differential protein synthesis during heat stress.
- To explore the mechanism of heat sensing by HSP70.
Main Methods:
- Review of existing literature on heat shock response.
- Analysis of the modulation of translation initiation factors (eIF-2 and eIF-4F).
- Investigation of the association between HSPs and protein kinases.
Main Results:
- Heat shock primarily regulates translation at the polypeptide chain initiation phase.
- Activities of initiation factors eIF-2 and eIF-4F are modulated during heat shock.
- HSP70 may act as a heat sensor, interacting with denatured proteins to regulate translation.
Conclusions:
- A conserved mechanism involving HSP70, denatured proteins, and eIF-2 kinase likely controls protein synthesis during heat shock.
- Deficiency in eIF-4F in heat-shocked cells contributes to preferential translation of HSP mRNAs.
- Understanding these regulatory pathways is key to cellular stress adaptation.