4IW0

Crystal structure and mechanism of activation of TANK-binding kinase 1.

(2013) Cell Rep 3: 734-746

• PubMed: 23453971 Search on PubMed
• DOI: https://doi.org/10.1016/j.celrep.2013.01.034
• Primary Citation of Related Structures:  
  4IW0, 4IWO, 4IWP, 4IWQ


• PubMed Abstract: 
  

  Tank-binding kinase I (TBK1) plays a key role in the innate immune system by integrating signals from pattern-recognition receptors. Here, we report the X-ray crystal structures of inhibitor-bound inactive and active TBK1 determined to 2.6 Å and 4.0 Å resolution, respectively. The structures reveal a compact dimer made up of trimodular subunits containing an N-terminal kinase domain (KD), a ubiquitin-like domain (ULD), and an α-helical scaffold dimerization domain (SDD). Activation rearranges the KD into an active conformation while maintaining the overall dimer conformation. Low-resolution SAXS studies reveal that the missing C-terminal domain (CTD) extends away from the main body of the kinase dimer. Mutants that interfere with TBK1 dimerization show significantly reduced trans-autophosphorylation but retain the ability to bind adaptor proteins through the CTD. Our results provide detailed insights into the architecture of TBK1 and the molecular mechanism of activation.

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Organizational Affiliation: 

EMBL Grenoble, 6 Rue Jules Horowitz, Grenoble 38042, France.