PMID: 23453971 , Related PDB ids: 4IW0, 4IWO, 4IWP, 4IWQ

Authors:

Larabi A, Devos JM, Ng SL, Nanao MH, Round A, Maniatis T, Panne D

Title:

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

Journal:

Cell Rep. 2013 Mar 28;3(3):734-46. doi: 10.1016/j.celrep.2013.01.034. Epub 2013, Feb 28.

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 A and 4.0 A 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 alpha-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.