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• W2078339163 abstract "Adenoviruses use the short noncoding RNA transcript virus-associated (VA) RNA(I) to counteract two critical elements of the host cell defense system, innate cellular immunity and RNA interference, mediated by the double-stranded RNA-activated protein kinase (PKR) and Dicer/RNA-induced silencing complex, respectively. We progressively shortened the VA RNA(I) terminal stem to examine its necessity for inhibition of PKR. Each deletion, up to 15 bp into the terminal stem, resulted in a cumulative decrease in PKR inhibitory activity. Remarkably, however, despite significant apparent destabilization of the RNA structure, the final RNA mutant that lacked the entire terminal stem (TSDelta21 RNA) efficiently bound PKR and exhibited wild-type inhibitory activity. TSDelta21 RNA stability was strongly influenced by solution pH, indicating the involvement of a protonated base within the VA RNA(I) central domain tertiary structure. Gel filtration chromatography and isothermal titration calorimetry analysis indicated that wild-type VA RNA(I) and TSDelta21 RNA form similar 1:1 complexes with PKR but that the latter lacks secondary binding site(s) that might be provided by the terminal stem. Although TSDelta21 RNA bound PKR with wild-type K(d), and overall change in free energy (DeltaG), the thermodynamics of binding (DeltaH and DeltaS) were significantly altered. These results demonstrate that the VA RNA(I) terminal stem is entirely dispensable for inhibition of PKR. Potentially, VA RNA(I) is therefore a truly bi-functional RNA; Dicer processing of the VA RNA(I) terminal stem saturates the RNA interference system while generating a mini-VA RNA(I) molecule that remains fully active against PKR." @default.
• W2078339163 created "2016-06-24" @default.
• W2078339163 creator A5072106538 @default.
• W2078339163 creator A5073697186 @default.
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• W2078339163 date "2008-06-01" @default.
• W2078339163 modified "2023-09-30" @default.
• W2078339163 title "Systematic Deletion of the Adenovirus-associated RNAI Terminal Stem Reveals a Surprisingly Active RNA Inhibitor of Double-stranded RNA-activated Protein Kinase" @default.
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• W2078339163 doi "https://doi.org/10.1074/jbc.m802300200" @default.
• W2078339163 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2427366" @default.
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