Higher-Order Substrate Recognition of eIF2α by the RNA-Dependent Protein Kinase PKR

  title={Higher-Order Substrate Recognition of eIF2α by the RNA-Dependent Protein Kinase PKR},
  author={Arvin C. Dar and Thomas E. Dever and Frank Sicheri},
In response to binding viral double-stranded RNA byproducts within a cell, the RNA-dependent protein kinase PKR phosphorylates the alpha subunit of the translation initiation factor eIF2 on a regulatory site, Ser51. This triggers the general shutdown of protein synthesis and inhibition of viral propagation. To understand the basis for substrate recognition by and the regulation of PKR, we determined X-ray crystal structures of the catalytic domain of PKR in complex with eIF2alpha. The… CONTINUE READING
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