Abstract:
:The double-stranded RNA-dependent kinase, PKR, is encoded by an interferon inducible gene and is largely responsible for the anti-viral effects of this cytokine. Recent studies have shown that PKR may also play a role in the regulation of normal cellular growth. Although numerous examples of viral strategies for inactivation of PKR exist, there is no evidence of PKR inactivation in tumors. We demonstrate here that the Tik gene, which encodes a dual-specificity kinase, is the murine homolog of PKR, the dsRNA-dependent kinase, and has undergone a rearrangement of one allele in a murine lymphocytic leukemia cell. We have cloned a cDNA that corresponds to a mutated transcript from the rearranged mPKR gene and show that while the mutated polypeptide retains its ability to dimerize and bind dsRNA, it is catalytically inactive. Although this mutated mPKR lacks apparent dominant-negative function, the net effect of reduced PKR activity in these cells may be significant.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Abraham N,Jaramillo ML,Duncan PI,Méthot N,Icely PL,Stojdl DF,Barber GN,Bell JCdoi
10.1006/excr.1998.4201subject
Has Abstractpub_date
1998-11-01 00:00:00pages
394-404issue
2eissn
0014-4827issn
1090-2422pii
S0014-4827(98)94201-Xjournal_volume
244pub_type
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