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• W2049520091 abstract "The RNA-dependent protein kinase (PKR) is implicated in the antiviral and antiproliferative actions of interferon. Mutant forms of human PKR display a transdominant behavior when expressed in transfected cells. The potential for the human PKR protein to physically interact with the mouse PKR homolog has therefore been examined. The yeast two-hybrid system was used to probe the association between mouse and human PKR proteins as measured by activation of two Gal4-responsive reporter genes,HIS3 andlacZ. Expression of full-length wild-type mouse PKR(1-515)WT as a Gal4 fusion protein did not exhibit the growth suppression phenotype in yeast characteristic of wild-type human PKR(1-551)WT. Coexpression of mouse PKR(1-515)WT as a Gal4 DNA-binding domain fusion with either the catalytic-deficient human PKR(1-551) K296R mutant, the RNA-binding-deficient human PKR(1-551)K64E/K296R double mutant, or wild-type mouse PKR(1-515)WT as full-length PKR-Gal4 activation domain fusions resulted in activation of theHIS3 andlacZ reporters. The N-terminal RNA-binding region of human PKR, both WT and the K64E RNA-binding-deficient mutant, also interacted with mouse PKR(1-515)WT sufficiently to activate the reporters but the human catalytic region did not. Mouse and human full-length PKR proteins expressed as glutathioneS-transferase (GST) fusions inEscherichia coliwere purified on Sepharose beads. Using GST-PKR fusion chromatography, direct physical interaction between the mouse and human PKR homologs was established. Intraspecies PKR interactions were more efficient than interspecies PKR interactions, and interactions between RNA-binding-sufficient PKR proteins were more efficient than those involving an RNA-binding mutant as measured by binding to GST-PKR protein Sepharose beads. The N-terminal region of human PKR within amino acids 1–184 was sufficient for binding mouse PKR. Purified mouse full-length PKR(1-515)WT GST fusion protein retained kinase activity on Sepharose beads, but the activity was not impaired by association with either the full-length or the N-terminal region of human PKR." @default.
• W2049520091 created "2016-06-24" @default.
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• W2049520091 date "1997-11-01" @default.
• W2049520091 modified "2023-09-27" @default.
• W2049520091 title "Interaction of the Human Protein Kinase PKR with the Mouse PKR Homolog Occurs via the N-Terminal Region of PKR and Does Not Inactivate Autophosphorylation Activity of Mouse PKR" @default.
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• W2049520091 doi "https://doi.org/10.1006/viro.1997.8824" @default.
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