Crystal structure of the phosphorylated Interleukin-2 tyrosine kinase catalytic domain

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.223 

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This is version 1.3 of the entry. See complete history


Crystal structures of interleukin-2 tyrosine kinase and their implications for the design of selective inhibitors.

Brown, K.Long, J.M.Vial, S.C.Dedi, N.Dunster, N.J.Renwick, S.B.Tanner, A.J.Frantz, J.D.Fleming, M.A.Cheetham, G.M.

(2004) J Biol Chem 279: 18727-18732

  • DOI: https://doi.org/10.1074/jbc.M400031200
  • Primary Citation of Related Structures:  
    1SM2, 1SNU, 1SNX

  • PubMed Abstract: 

    Interleukin-2 tyrosine kinase, Itk, is an important member of the Tec family of non-receptor tyrosine kinases that play a central role in signaling through antigen receptors such as the T-cell receptor, B-cell receptor, and Fcepsilon. Selective inhibition of Itk may be an important way of modulating many diseases involving heightened or inappropriate activation of the immune system. In addition to an unliganded nonphophorylated Itk catalytic kinase domain, we determined the crystal structures of the phosphorylated and nonphosphorylated kinase domain bound to staurosporine, a potent broad-spectrum kinase inhibitor. These structures are useful for the design of novel, highly potent and selective Itk inhibitors and provide insight into the influence of inhibitor binding and phosphorylation on the conformation of Itk.

  • Organizational Affiliation

    Vertex Pharmaceuticals (Europe) Ltd., 88 Milton Park, Abingdon, Oxfordshire OX14 4RY, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein kinase ITK/TSK
A, B
264Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q08881 (Homo sapiens)
Explore Q08881 
Go to UniProtKB:  Q08881
PHAROS:  Q08881
GTEx:  ENSG00000113263 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ08881
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on STU

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C28 H26 N4 O3
Binding Affinity Annotations 
IDSourceBinding Affinity
STU Binding MOAD:  1SM2 Ki: 10 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.223 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.1α = 90
b = 74.4β = 93.9
c = 78.9γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-07-16
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations