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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Virology

Background:

  • The protein kinase PKR (double-stranded RNA-activated protein kinase) is a key antiviral enzyme.
  • PKR is typically activated by double-stranded RNA (dsRNA).
  • The mechanism by which PKR is activated by RNAs with limited secondary structure, particularly single-stranded regions, is not fully understood.

Purpose of the Study:

  • To elucidate the mechanism of PKR activation by single-stranded RNAs (ssRNAs).
  • To identify the specific regions of PKR involved in ssRNA binding and activation.
  • To understand how ssRNA binding contributes to the antiviral function of PKR.

Main Methods:

  • Biochemical assays to measure RNA binding affinity (dissociation constants).
  • Enzyme activity assays to assess PKR activation by different RNA structures.
  • Analysis of PKR constructs lacking specific domains.
  • Photocrosslinking experiments to map RNA-protein interactions.

Main Results:

  • Single-stranded RNAs bind to PKR with micromolar affinity and induce activation.
  • A 5'-triphosphate group slightly enhances ssRNA binding affinity.
  • PKR constructs lacking the dsRNA binding domain can be activated by ssRNA and bind to a basic region near the N-terminus.
  • The isolated kinase domain does not bind or get activated by ssRNA.
  • Photocrosslinking confirms interaction between the basic region and RNA in full-length PKR.

Conclusions:

  • PKR activation by structured RNAs involves bivalent interactions.
  • These interactions occur between the dsRNA binding domain and the N-terminal basic region.
  • Bivalent binding enhances RNA affinity and increases the formation of productive PKR-RNA complexes.
  • This mechanism explains how RNAs with limited secondary structure activate PKR's antiviral function.