Gads SH2 domain/CD28-derived peptide complex

Experimental Data Snapshot

  • Resolution: 1.20 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.149 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Crystal Structures and Thermodynamic Analysis Reveal Distinct Mechanisms of CD28 Phosphopeptide Binding to the Src Homology 2 (SH2) Domains of Three Adaptor Proteins

Inaba, S.Numoto, N.Ogawa, S.Morii, H.Ikura, T.Abe, R.Ito, N.Oda, M.

(2017) J Biol Chem 292: 1052-1060

  • DOI: https://doi.org/10.1074/jbc.M116.755173
  • Primary Citation of Related Structures:  
    5AUL, 5GJH, 5GJI

  • PubMed Abstract: 

    Full activation of T cells and differentiation into effector T cells are essential for many immune responses and require co-stimulatory signaling via the CD28 receptor. Extracellular ligand binding to CD28 recruits protein-tyrosine kinases to its cytoplasmic tail, which contains a YMNM motif. Following phosphorylation of the tyrosine, the proteins growth factor receptor-bound protein 2 (Grb2), Grb2-related adaptor downstream of Shc (Gads), and p85 subunit of phosphoinositide 3-kinase may bind to pYMNM (where pY is phosphotyrosine) via their Src homology 2 (SH2) domains, leading to downstream signaling to distinct immune pathways. These three adaptor proteins bind to the same site on CD28 with variable affinity, and all are important for CD28-mediated co-stimulatory function. However, the mechanism of how these proteins recognize and compete for CD28 is unclear. To visualize their interactions with CD28, we have determined the crystal structures of Gads SH2 and two p85 SH2 domains in complex with a CD28-derived phosphopeptide. The high resolution structures obtained revealed that, whereas the CD28 phosphopeptide bound to Gads SH2 is in a bent conformation similar to that when bound to Grb2 SH2, it adopts a more extended conformation when bound to the N- and C-terminal SH2 domains of p85. These differences observed in the peptide-protein interactions correlated well with the affinity and other thermodynamic parameters for each interaction determined by isothermal titration calorimetry. The detailed insight into these interactions reported here may inform the development of compounds that specifically inhibit the association of CD28 with these adaptor proteins to suppress excessive T cell responses, such as in allergies and autoimmune diseases.

  • Organizational Affiliation

    From the Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto 606-8522, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GRB2-related adapter protein 2
A, C
100Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O75791 (Homo sapiens)
Explore O75791 
Go to UniProtKB:  O75791
PHAROS:  O75791
GTEx:  ENSG00000100351 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75791
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell-specific surface glycoprotein CD28
B, D
8Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P10747 (Homo sapiens)
Explore P10747 
Go to UniProtKB:  P10747
PHAROS:  P10747
GTEx:  ENSG00000178562 
Entity Groups  
UniProt GroupP10747
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PTR
B, D
Experimental Data & Validation

Experimental Data

  • Resolution: 1.20 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.149 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.602α = 90
b = 53.338β = 90
c = 108.302γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-14
    Type: Initial release
  • Version 1.1: 2017-02-01
    Changes: Database references
  • Version 1.2: 2017-05-10
    Changes: Database references
  • Version 1.3: 2023-11-08
    Changes: Data collection, Database references, Refinement description
  • Version 1.4: 2023-11-15
    Changes: Data collection