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A new double-stranded RNA-binding protein that interacts with PKR.

C J Coolidge1, J G Patton

  • 1Department of Molecular Biology, Box 1820, Station B, Vanderbilt University, Nashville, TN 37235, USA.

Nucleic Acids Research
|February 24, 2000
PubMed
Summary

A novel double-stranded RNA-binding protein, p74, interacts with protein kinase R (PKR). Its interaction with a defective PKR mutant (K296R) leads to cell death, suggesting a role in regulating PKR activity and cell growth.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Virology

Background:

  • Double-stranded RNA-binding proteins (dsRBPs) play crucial roles in cellular processes.
  • Protein kinase R (PKR) is a key regulator of protein synthesis and cellular stress responses.
  • Interactions between dsRBPs and PKR can modulate PKR activity.

Purpose of the Study:

  • To identify and characterize a novel dsRBP, p74, and investigate its interaction with PKR.
  • To elucidate the functional consequences of p74-PKR interactions on cellular processes.
  • To explore the potential role of p74 in PKR-mediated signaling pathways.

Main Methods:

  • Identification and characterization of a 74 kDa dsRNA-binding protein (p74) with homology to mouse Spnr.
  • Co-expression of p74 with wild-type and mutant PKR (K296R) in Saccharomyces cerevisiae.

Related Experiment Videos

  • Analysis of cell morphology, viability, and PKR activity in yeast transformants.
  • Investigating the effect of eukaryotic translation initiation factor 2 alpha (eIF2alpha) overexpression on cell viability.

    • Main Results:

    • p74 possesses two dsRNA-binding motifs (dsRBMs) essential for dsRNA binding.
    • Co-expression of p74 with wild-type PKR did not affect PKR activity.
    • Co-expression of p74 with PKR K296R mutant induced abnormal morphology and cell death, which was rescued by eIF2alpha overexpression.

    Conclusions:

    • p74 interacts with both wild-type and catalytically inactive PKR.
    • The interaction between p74 and PKR K296R mutant can lead to cell death, suggesting a dominant-negative effect.
    • A hypothesis is proposed where competing heterodimers involving p74-PKR K296R and eIF2alpha-PKR K296R regulate cell growth and survival.