3GXU

Crystal structure of Eph receptor and ephrin complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.273 

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Literature

Structural characterization of the EphA4-ephrin-B2 complex reveals new features enabling Eph-ephrin binding promiscuity

Qin, H.Noberini, R.Huan, X.Shi, J.Pasquale, E.B.Song, J.

(2009) J Biol Chem 

  • DOI: 10.1074/jbc.M109.064824
  • Primary Citation of Related Structures:  
    3GXU

  • PubMed Abstract: 
  • EphA and EphB receptors preferentially bind ephrin-A and ephrin-B ligands, respectively, but EphA4 is exceptional for its ability to bind all ephrins. Here, we report the crystal structure of the EphA4 ligand-binding domain in complex with ephrin-B2, which represents the first structure of an EphA-ephrin-B interclass complex ...

    EphA and EphB receptors preferentially bind ephrin-A and ephrin-B ligands, respectively, but EphA4 is exceptional for its ability to bind all ephrins. Here, we report the crystal structure of the EphA4 ligand-binding domain in complex with ephrin-B2, which represents the first structure of an EphA-ephrin-B interclass complex. A loose fit of the ephrin-B2 G-H loop in the EphA4 ligand-binding channel is consistent with a relatively weak binding affinity. Additional surface contacts also exist between EphA4 residues Gln(12) and Glu(14) and ephrin-B2. Mutation of Gln(12) and Glu(14) does not cause significant structural changes in EphA4 or changes in its affinity for ephrin-A ligands. However, the EphA4 mutant has approximately 10-fold reduced affinity for ephrin-B ligands, indicating that the surface contacts are critical for interclass but not intraclass ephrin binding. Thus, EphA4 uses different strategies to bind ephrin-A or ephrin-B ligands and achieve binding promiscuity. NMR characterization also suggests that the contacts of Gln(12) and Glu(14) with ephrin-B2 induce dynamic changes throughout the whole EphA4 ligand-binding domain. Our findings shed light on the distinctive features that enable the remarkable ligand binding promiscuity of EphA4 and suggest that diverse strategies are needed to effectively disrupt different Eph-ephrin complexes.


    Related Citations: 
    • Crystal structure and NMR binding reveal that two small molecule antagonists target the high affinity ephrin-binding channel of the EphA4 receptor
      Qin, H., Shi, J., Noberini, R., Pasquale, E.B., Song, J.
      (2008) J Biol Chem 283: 29473
    • Crystal structure of an Eph receptor-ephrin complex
      Himanen, J.P., Rajashankar, K.R., Lackmann, M., Cowan, C.A., Henkemeyer, M., Nikolov, D.B.
      (2001) Nature 414: 933

    Organizational Affiliation

    Department of Biological Sciences, Faculty of Science, National University of Singapore, 10 Kent Ridge Crescent, Singapore.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ephrin type-A receptor 4A175Homo sapiensMutation(s): 0 
Gene Names: EPHA4HEK8SEKTYRO1
EC: 2.7.10.1
UniProt & NIH Common Fund Data Resources
Find proteins for P54764 (Homo sapiens)
Explore P54764 
Go to UniProtKB:  P54764
PHAROS:  P54764
GTEx:  ENSG00000116106 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP54764
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ephrin-B2B143Homo sapiensMutation(s): 0 
Gene Names: EFNB2EPLG5HTKLLERK5
UniProt & NIH Common Fund Data Resources
Find proteins for P52799 (Homo sapiens)
Explore P52799 
Go to UniProtKB:  P52799
PHAROS:  P52799
GTEx:  ENSG00000125266 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52799
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.273 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.651α = 90
b = 48.711β = 110.43
c = 64.469γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2009-04-03 
  • Released Date: 2009-10-27 
  • Deposition Author(s): Qin, H.N., Song, J.X.

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance