Autoinhibited Src kinase bound to ADP

Experimental Data Snapshot

  • Resolution: 2.42 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 

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A switch in nucleotide affinity governs activation of the Src and Tec family kinases.

von Raussendorf, F.de Ruiter, A.Leonard, T.A.

(2017) Sci Rep 7: 17405-17405

  • DOI: https://doi.org/10.1038/s41598-017-17703-5
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Tec kinases, closely related to Src family kinases, are essential for lymphocyte function in the adaptive immune system. Whilst the Src and Abl kinases are regulated by tail phosphorylation and N-terminal myristoylation respectively, the Tec kinases are notable for the absence of either regulatory element. We have found that the inactive conformations of the Tec kinase Itk and Src preferentially bind ADP over ATP, stabilising both proteins. We demonstrate that Itk adopts the same conformation as Src and that the autoinhibited conformation of Src is independent of its C-terminal tail. Allosteric activation of both Itk and Src depends critically on the disruption of a conserved hydrophobic stack that accompanies regulatory domain displacement. We show that a conformational switch permits the exchange of ADP for ATP, leading to efficient autophosphorylation and full activation. In summary, we propose a universal mechanism for the activation and autoinhibition of the Src and Tec kinases.

  • Organizational Affiliation

    Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences (BOKU), 1190, Vienna, Austria.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein kinase455Mus musculusMutation(s): 0 
Gene Names: Src
UniProt & NIH Common Fund Data Resources
Find proteins for P05480 (Mus musculus)
Explore P05480 
Go to UniProtKB:  P05480
IMPC:  MGI:98397
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05480
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PTR
Binding Affinity Annotations 
IDSourceBinding Affinity
PTR BindingDB:  6F3F -TΔS: -1.81e+1 (kJ/mol) from 1 assay(s)
ΔG: -2.14e+1 (kJ/mol) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.42 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.011α = 90
b = 82.974β = 90
c = 105.051γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Austrian Science FundAustriaP28135

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-27
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description