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48887Pathway880

Source:http://www.reactome.org/biopax/48887Pathway880

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Authored: Shamovsky, V, 2009-12-16, Cell stimulation with viral ds RNA leads to the activation of two IKK-related serine/threonine kinases, TBK1 and IKK-i which directly phosphorylate IRF3 and IRF7 promoting their dimerization and translocation into the nucleus. Although both kinases show structural and functional similarities, it seems that TBK1 and IKK-i differ in their regulation of downstream signaling events of TLR3.<p>IRF3 activation and IFN-b production by poly(I:C) are decreased in TBK1-deficient mouse fibroblasts, whereas normal activation was observed in the IKK-i-deficient fibroblasts. However, in double-deficient mouse fibroblasts, the activation of IRF3 is completely abolished, suggesting a partially redundant functions of TBK1 and IKK-i [Hemmi et al 2004].<p>TLR3 recruits and activates PI3 kinase (PI3K), which activates the downstream kinase, Akt, leading to full phosphorylation and activation of IRF-3 [Sarkar SN et al 2004]. When PI3K is not recruited to TLR3 or its activity is blocked, IRF-3 is only partially phosphorylated and fails to bind the promoter of the target gene., Edited: Shamovsky, V, 2009-12-16, Reviewed: Gay, NJ, 2006-04-24 16:48:17
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Viral dsRNA:TLR3:TRIF Complex Activates TBK1/IKK epsilon
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