Article abstract
Nature Structural & Molecular Biology 16, 63 - 70 (2008)
Published online: 30 November 2008 | doi:10.1038/nsmb.1529
Rapid evolution of protein kinase PKR alters sensitivity to viral inhibitors
Stefan Rothenburg1, Eun Joo Seo1, James S Gibbs2, Thomas E Dever1 & Katharina Dittmar3
Abstract
Protein kinase PKR (also known as EIF2AK2) is activated during viral infection and phosphorylates the 
subunit of eukaryotic translation initiation factor 2 (eIF2), leading to inhibition of translation and viral replication. We report fast evolution of the PKR kinase domain in vertebrates, coupled with positive selection of specific sites. Substitution of positively selected residues in human PKR with residues found in related species altered sensitivity to PKR inhibitors from different poxviruses. Species-specific differences in sensitivity to poxviral pseudosubstrate inhibitors were identified between human and mouse PKR, and these differences were traced to positively selected residues near the eIF2 binding site. Our findings indicate how an antiviral protein evolved to evade viral inhibition while maintaining its primary function. Moreover, the identified species-specific differences in the susceptibility to viral inhibitors have important implications for studying human infections in nonhuman model systems.
- Laboratory of Gene Regulation and Development, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA.
- Laboratory of Viral Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
- Department of Biological Sciences, State University of New York at Buffalo, Buffalo, New York 14260, USA.
Correspondence to: Stefan Rothenburg1 e-mail: rothenst@mail.nih.gov
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