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  • Title: PACT and PKR: turning on NF-kappa B in the absence of virus.
    Author: D'Acquisto F, Ghosh S.
    Journal: Sci STKE; 2001 Jul 03; 2001(89):re1. PubMed ID: 11752660.
    Abstract:
    Double-stranded RNA (dsRNA)-dependent protein kinase R (PKR) has been generally thought to be solely regulated by dsRNA, an intermediate in the replication of many viruses. However, the notion that PKR acts solely as a sensor for viral infection has been challenged by recent findings that alteration of PKR activity has effects on cellular growth and by the discovery of a virus-independent activator of PKR, a cellular protein called PACT (PKR-activating protein). The activation of the transcription factor nuclear factor kappa B (NF-kappaB) by PKR has been shown to account for the host antiviral response. We summarize the most recent findings on the molecular mechanisms leading to the activation of NF-kappaB by PKR and discuss three major unanswered questions. First, is PACT an alternative to dsRNA as a direct activator of the PKR-NF-kappaB pathway? Second, how is PACT itself activated and targeted to PKR? And third, what are the biological functions of PKR in the absence of viral infection?
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