Phosphorylation-dependent activation of TAK1 mitogen-activated protein kinase kinase kinase by TAB1

FEBS Lett. 2000 Jun 2;474(2-3):141-5. doi: 10.1016/s0014-5793(00)01588-x.


TAK1 is a mitogen-activated protein kinase kinase kinase (MAP3K) that is involved in the c-Jun N-terminal kinase/p38 MAPKs and NF-kappaB signaling pathways. Here, we characterized the molecular mechanisms of TAK1 activation by its specific activator TAB1. Autophosphorylation of two threonine residues in the activation loop of TAK1 was necessary for TAK1 activation. Association with TAK1 and induction of TAK1 autophosphorylation required the C-terminal 24 amino acids of TAB1, but full TAK1 activation required additional C-terminal Ser/Thr rich sequences. These results demonstrated that the association between the kinase domain of TAK1 and the C-terminal TAB1 triggered the phosphorylation-dependent TAK1 activation mechanism.

MeSH terms

  • Adaptor Proteins, Signal Transducing*
  • Binding Sites
  • Carrier Proteins / chemistry
  • Carrier Proteins / genetics
  • Carrier Proteins / metabolism*
  • Enzyme Activation
  • HeLa Cells
  • Humans
  • I-kappa B Kinase
  • Intracellular Signaling Peptides and Proteins*
  • JNK Mitogen-Activated Protein Kinases
  • MAP Kinase Kinase Kinases / chemistry
  • MAP Kinase Kinase Kinases / genetics
  • MAP Kinase Kinase Kinases / metabolism*
  • Mitogen-Activated Protein Kinases / metabolism
  • Models, Biological
  • Mutation / genetics
  • Phosphorylation
  • Phosphothreonine / metabolism
  • Precipitin Tests
  • Protein Binding
  • Protein Structure, Tertiary
  • Protein-Serine-Threonine Kinases / metabolism
  • Recombinant Fusion Proteins / chemistry
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Transfection


  • Adaptor Proteins, Signal Transducing
  • Carrier Proteins
  • Intracellular Signaling Peptides and Proteins
  • Recombinant Fusion Proteins
  • TAB1 protein, MAPKKK activator, vertebrate
  • TAB1 protein, human
  • Phosphothreonine
  • Protein-Serine-Threonine Kinases
  • CHUK protein, human
  • I-kappa B Kinase
  • IKBKB protein, human
  • IKBKE protein, human
  • JNK Mitogen-Activated Protein Kinases
  • Mitogen-Activated Protein Kinases
  • MAP Kinase Kinase Kinases
  • MAP kinase kinase kinase 7