TAK1 is activated

Stable Identifier
Reaction [uncertain]
Homo sapiens
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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
14633987 Role of the TAB2-related protein TAB3 in IL-1 and TNF signaling

Shibuya, H, Gaynor, RB, Ninomiya-Tsuji, J, Takaesu, G, Ishitani, T, Matsumoto, K

EMBO J 2003
15327770 TAB2 and TAB3 activate the NF-kappaB pathway through binding to polyubiquitin chains

Deng, L, Seth, RB, Kanayama, A, Shaito, A, Hong, M, Chiu, YH, Chen, ZJ, Sun, L, Ea, CK

Mol Cell 2004
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
Orthologous Events
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