Crystal structure of PH domain of Bruton's tyrosine kinase

Experimental Data Snapshot

  • Resolution: 2.58 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

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Crystal structure of the Bruton's tyrosine kinase PH domain with phosphatidylinositol

Murayama, K.Kato-Murayama, M.Mishima, C.Akasaka, R.Shirouzu, M.Fukui, Y.Yokoyama, S.

(2008) Biochem Biophys Res Commun 377: 23-28

  • DOI: https://doi.org/10.1016/j.bbrc.2008.09.055
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bruton's tyrosine kinase (Btk) of the Tec family possesses a Pleckstrin homology (PH) domain, which is responsible for plasma membrane targeting. In this study, the crystal structure of the Btk PH domain in complex with dibutylyl-phosphatidylinositol-3,4,5-triphosphate was determined. The structure revealed that the Btk PH domain forms a homodimer and that each molecule binds phosphatidylinositol in the binding pocket. The side chain of Lys18 within a Btk-specific insertion in the beta1-beta2 loop is able to form a hydrogen bond with the diacylglycerol moiety of phosphatidylinositol. The other Btk-specific insertion in the beta5-beta6 loop constitutes the dimerization interface. Thus, the modes of phosphatidylinositol recognition and Btk PH domain dimerization are distinct from those of other PH domains.

  • Organizational Affiliation

    Graduate School of Biomedical Engineering, Tohoku University, Sendai, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein kinase BTK
A, B, C, D
169Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q06187 (Homo sapiens)
Explore Q06187 
Go to UniProtKB:  Q06187
PHAROS:  Q06187
GTEx:  ENSG00000010671 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ06187
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.58 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.417α = 90
b = 62.499β = 94.33
c = 117.064γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2008-05-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2015-07-08
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary