2GNC

Crystal structure of srGAP1 SH3 domain in the slit-robo signaling pathway


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.225 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structural Basis of Robo Proline-rich Motif Recognition by the srGAP1 Src Homology 3 Domain in the Slit-Robo Signaling Pathway

Li, X.Chen, Y.Liu, Y.Gao, J.Gao, F.Bartlam, M.Wu, J.Y.Rao, Z.

(2006) J Biol Chem 281: 28430-28437

  • DOI: https://doi.org/10.1074/jbc.M604135200
  • Primary Citation of Related Structures:  
    2GNC

  • PubMed Abstract: 

    The Slit-Robo (sr) GTPase-activating protein (GAPs) are important components in the intracellular pathway mediating Slit-Robo signaling in axon guidance and cell migration. We report the first crystal structure of the srGAP1 SH3 domain at 1.8-A resolution. The unusual side chain conformation of the conserved Phe-13 in the P1 pocket renders the ligand binding pocket shallow and narrow, which contributes toward the low binding affinity. Moreover, the opposing electrostatic charge and the hydrophobic properties of the P3 specificity pocket are consistent with the observed binding characteristics of the srGAP1 SH3 domain to its ligand. Surface plasmon resonance experiments indicate that the srGAP1 SH3 domain interacts with its natural ligand inaCtoN orientation. The srGAP1 SH3 domain can bind to both the CC2 and CC3 motifs in vitro. The N-terminal two acidic residues in the CC3 motif recognition site are necessary for srGAP1 SH3 domain binding. A longer CC3 peptide (CC3-FL) binds with greater affinity than its shorter counterpart, suggesting that the residues surrounding the proline-rich core are important for protein-peptide interactions. Our study reveals previously unknown properties of the srGAP-Robo interaction. Our data provide a structural basis for the srGAP-Robo interaction, consistent with the role of the Robo intracellular domain in interacting with other downstream signaling molecules and mediating versatile and dynamic responses to axon guidance and cell migration cues.


  • Organizational Affiliation

    Tsinghua-Nankai IBP Joint Research Group for Structural Biology, Tsinghua University, Beijing 100084, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SLIT-ROBO Rho GTPase-activating protein 1
A, B
60Mus musculusMutation(s): 0 
UniProt
Find proteins for Q91Z69 (Mus musculus)
Explore Q91Z69 
Go to UniProtKB:  Q91Z69
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ91Z69
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.225 
  • Space Group: P 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.321α = 90
b = 70.321β = 90
c = 70.321γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
HKL-2000data reduction
CNSrefinement
CrystalCleardata reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-07-18
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Refinement description