Reactome | Activation of TAK1 complex bound to activated TLR4 complex

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Activation of TAK1 complex bound to activated TLR4 complex

Stable Identifier

R-HSA-936951

Type

Reaction [transition]

Species

Homo sapiens

Compartment

cytosol, endosome membrane

ReviewStatus

5/5

Locations in the PathwayBrowser

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Immune System (Homo sapiens)

- Innate Immune System (Homo sapiens)
  - Toll-like Receptor Cascades (Homo sapiens)
    - Toll Like Receptor 4 (TLR4) Cascade (Homo sapiens)
      - MyD88-independent TLR4 cascade (Homo sapiens)
        
        TRIF (TICAM1)-mediated TLR4 signaling (Homo sapiens)
        
        TRAF6-mediated induction of TAK1 complex within TLR4 complex (Homo sapiens)
        
        Activation of TAK1 complex bound to activated TLR4 complex (Homo sapiens)

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Activation of TAK1 complex bound to activated TLR4 complex

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The TAK1 complex consists of Transforming growth factor-beta (TGFB)-activated kinase (TAK1) and TAK1-binding protein 1 (TAB1), TAB2 and TAB3. TAK1 requires TAB1 for its kinase activity (Shibuya et al. 1996, Sakurai et al. 2000). TAB1 promotes TAK1 autophosphorylation at the kinase activation lobe, probably through an allosteric mechanism (Brown et al. 2005, Ono et al. 2001). The TAK1 complex is regulated by polyubiquitination. Binding of TAB2 and TAB3 to Lys63-linked polyubiquitin chains leads to the activation of TAK1 by an uncertain mechanism. Binding of multiple TAK1 complexes to the same polyubiquitin chain may promote oligomerization of TAK1, facilitating TAK1 autophosphorylation and subsequent activation of its kinase activity (Kishimoto et al. 2000). The binding of TAB2/3 to polyubiquitinated TRAF6 may facilitate polyubiquitination of TAB2/3 by TRAF6 (Ishitani et al. 2003), which might result in conformational changes within the TAK1 complex that lead to TAK1 activation. Another possibility is that TAB2/3 may recruit the IKK complex by binding to ubiquitinated NEMO; polyubiquitin chains may function as a scaffold for higher order signaling complexes that allow interaction between TAK1 and IKK (Kanayama et al. 2004).

Literature References

PubMed ID	Title	Journal	Year
17496917	Ubiquitin-mediated activation of TAK1 and IKK Xu, M, Adhikari, A, Chen, ZJ	Oncogene	2007
16186825	Essential function for the kinase TAK1 in innate and adaptive immune responses Kawai, T, Takeuchi, O, Sanjo, H, Takeda, K, Ninomiya-Tsuji, J, Sato, S, Yamamoto, M, Akira, S, Matsumoto, K	Nat Immunol	2005
16260493	TAK1, but not TAB1 or TAB2, plays an essential role in multiple signaling pathways in vivo Shim, JH, Steckel, M, Xiao, C, Yamada, G, Ghosh, S, Paschal, AE, Bussey, C, Matsumoto, K, Tanaka, N, Rao, P, Hayden, MS, Akira, S, Bailey, ST, Lee, KY	Genes Dev	2005
10702308	TAK1 mitogen-activated protein kinase kinase kinase is activated by autophosphorylation within its activation loop Kishimoto, K, Ninomiya-Tsuji, J, Matsumoto, K	J Biol Chem	2000