The protein kinase PKR: a molecular clock that sequentially activates survival and death programs.
EMBO J, 2004/2/11;23(3):564-71.
Donzé O[1], Deng J, Curran J, Sladek R, Picard D, Sonenberg N
Affiliations
PMID: 14749731
Impact factor: 14.012
Abstract
Cell death and survival play a key role in the immune system as well as during development. The control mechanisms that balance cell survival against cell death are not well understood. Here we report a novel strategy used by a single protein to regulate chronologically cell survival and death. The interferon-induced protein kinase PKR acts as a molecular clock by using catalysis-dependent and -independent activities to temporally induce cell survival prior to cell death. We show that the proapoptotic protein PKR surprisingly activates a survival pathway, which is mediated by NF-kappaB to delay apoptosis. Cell death is then induced by PKR through the phosphorylation of eIF-2alpha. This unique temporal control might serve as a paradigm for other kinases whose catalytic activity is not required for all of their functions.
MeSH terms
Animals; Apoptosis; Cell Survival; Eukaryotic Initiation Factor-2; Mice; NF-kappa B; NIH 3T3 Cells; Phosphorylation; Signal Transduction; eIF-2 Kinase
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