1I85

CRYSTAL STRUCTURE OF THE CTLA-4/B7-2 COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for co-stimulation by the human CTLA-4/B7-2 complex.

Schwartz, J.C.Zhang, X.Fedorov, A.A.Nathenson, S.G.Almo, S.C.

(2001) Nature 410: 604-608

  • DOI: 10.1038/35069112

  • PubMed Abstract: 
  • Regulation of T-cell activity is dependent on antigen-independent co-stimulatory signals provided by the disulphide-linked homodimeric T-cell surface receptors, CD28 and CTLA-4 (ref. 1). Engagement of CD28 with B7-1 and B7-2 ligands on antigen-presen ...

    Regulation of T-cell activity is dependent on antigen-independent co-stimulatory signals provided by the disulphide-linked homodimeric T-cell surface receptors, CD28 and CTLA-4 (ref. 1). Engagement of CD28 with B7-1 and B7-2 ligands on antigen-presenting cells (APCs) provides a stimulatory signal for T-cell activation, whereas subsequent engagement of CTLA-4 with these same ligands results in attenuation of the response. Given their central function in immune modulation, CTLA-4- and CD28-associated signalling pathways are primary therapeutic targets for preventing autoimmune disease, graft versus host disease, graft rejection and promoting tumour immunity. However, little is known about the cell-surface organization of these receptor/ligand complexes and the structural basis for signal transduction. Here we report the 3.2-A resolution structure of the complex between the disulphide-linked homodimer of human CTLA-4 and the receptor-binding domain of human B7-2. The unusual dimerization properties of both CTLA-4 and B7-2 place their respective ligand-binding sites distal to the dimer interface in each molecule and promote the formation of an alternating arrangement of bivalent CTLA-4 and B7-2 dimers that extends throughout the crystal. Direct observation of this CTLA-4/B7-2 network provides a model for the periodic organization of these molecules within the immunological synapse and suggests a distinct mechanism for signalling by dimeric cell-surface receptors.


    Organizational Affiliation

    [1] Department of Microbiology and Immunology, [2] These authors contributed equally to this work.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
T LYMPHOCYTE ACTIVATION ANTIGEN CD86
A, B
110Homo sapiensMutation(s): 0 
Gene Names: CD86 (CD28LG2)
Find proteins for P42081 (Homo sapiens)
Go to Gene View: CD86
Go to UniProtKB:  P42081
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYTOTOXIC T-LYMPHOCYTE-ASSOCIATED PROTEIN 4
C, D
126Homo sapiensMutation(s): 0 
Gene Names: CTLA4 (CD152)
Find proteins for P16410 (Homo sapiens)
Go to Gene View: CTLA4
Go to UniProtKB:  P16410
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.217 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 47.850α = 90.00
b = 54.560β = 91.63
c = 103.090γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance