Connecting Mitochondria and Innate Immunity

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Connecting Mitochondria and Innate Immunity Sarah M. McWhirter, Benjamin R. tenOever, Tom Maniatis  Cell  Volume 122, Issue 5, Pages 645-647 (September 2005) DOI: 10.1016/j.cell.2005.08.026 Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 1 Viral Infection Results in the Activation of Multiple Pathways The MAVS protein coordinates several signaling pathways required for activation of the IFN-β gene in response to virus infection. The MAVS protein, localized in mitochondria, is a key intermediate in the pathways that link the intracellular detection of virus by RIG-I with downstream signaling events. MAVS binds to TRAF6. Signal-induced polyubiquitination of TRAF6 (by the E1 ligase and UBC13/UEV1A) is known to promote its recruitment to a complex containing the TAK1 kinase and TAB2 adaptor protein. Activated TAK1 then phosphorylates and activates both the IKK complex as well as the stress-activated kinase cascade (Chen, 2005). The stress-activated kinase cascade leads to the induction of the transcription factors ATF2/cJun. The phosphorylation of IκB by the IKK complex marks IκB for ubiquitination and subsequent degradation by the proteasome (Chen, 2005). NF-κB then translocates to the nucleus and binds to the enhancer for the IFN-β gene. In addition, phosphorylation of IRF3 and IRF7 by the “noncanonical” kinases TBK1 and IKKϵ downstream of the TRAF2 complex leads to the dimerization and translocation of the IRF proteins to the nucleus (Levy and Marie, 2004). The coordination of these pathways leads to assembly of a multiprotein enhancer complex, the enhanceosome, which drives expression of the IFN-β gene (Maniatis et al., 1998). Cell 2005 122, 645-647DOI: (10.1016/j.cell.2005.08.026) Copyright © 2005 Elsevier Inc. Terms and Conditions