3QA8

Crystal Structure of inhibitor of kappa B kinase beta


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.344 
  • R-Value Work: 0.308 
  • R-Value Observed: 0.310 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal structure of inhibitor of kappaB kinase beta.

Xu, G.Lo, Y.C.Li, Q.Napolitano, G.Wu, X.Jiang, X.Dreano, M.Karin, M.Wu, H.

(2011) Nature 

  • DOI: 10.1038/nature09853
  • Primary Citation of Related Structures:  
    3RZF, 3QA8

  • PubMed Abstract: 
  • Inhibitor of κB (IκB) kinase (IKK) phosphorylates IκB proteins, leading to their degradation and the liberation of nuclear factor κB for gene transcription. Here we report the crystal structure of IKKβ in complex with an inhibitor, at a resolution of ...

    Inhibitor of κB (IκB) kinase (IKK) phosphorylates IκB proteins, leading to their degradation and the liberation of nuclear factor κB for gene transcription. Here we report the crystal structure of IKKβ in complex with an inhibitor, at a resolution of 3.6 Å. The structure reveals a trimodular architecture comprising the kinase domain, a ubiquitin-like domain (ULD) and an elongated, α-helical scaffold/dimerization domain (SDD). Unexpectedly, the predicted leucine zipper and helix-loop-helix motifs do not form these structures but are part of the SDD. The ULD and SDD mediate a critical interaction with IκBα that restricts substrate specificity, and the ULD is also required for catalytic activity. The SDD mediates IKKβ dimerization, but dimerization per se is not important for maintaining IKKβ activity and instead is required for IKKβ activation. Other IKK family members, IKKα, TBK1 and IKK-i, may have a similar trimodular architecture and function.


    Organizational Affiliation

    Department of Biochemistry, Weill Cornell Medical College, New York, New York 10021, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MGC80376 proteinABCDEFGH676Xenopus laevisMutation(s): 2 
Gene Names: ikbkb.LikbkbMGC80376
EC: 2.7.11.10
Find proteins for Q6INT1 (Xenopus laevis)
Explore Q6INT1 
Go to UniProtKB:  Q6INT1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.60 Å
  • R-Value Free: 0.344 
  • R-Value Work: 0.308 
  • R-Value Observed: 0.310 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.17α = 71.28
b = 140.339β = 79.56
c = 161.167γ = 86.04
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-04-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance