1I8L

HUMAN B7-1/CTLA-4 CO-STIMULATORY COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the B7-1/CTLA-4 complex that inhibits human immune responses.

Stamper, C.C.Zhang, Y.Tobin, J.F.Erbe, D.V.Ikemizu, S.Davis, S.J.Stahl, M.L.Seehra, J.Somers, W.S.Mosyak, L.

(2001) Nature 410: 608-611

  • DOI: 10.1038/35069118

  • PubMed Abstract: 
  • Optimal immune responses require both an antigen-specific and a co-stimulatory signal. The shared ligands B7-1 and B7-2 on antigen-presenting cells deliver the co-stimulatory signal through CD28 and CTLA-4 on T cells. Signalling through CD28 augments ...

    Optimal immune responses require both an antigen-specific and a co-stimulatory signal. The shared ligands B7-1 and B7-2 on antigen-presenting cells deliver the co-stimulatory signal through CD28 and CTLA-4 on T cells. Signalling through CD28 augments the T-cell response, whereas CTLA-4 signalling attenuates it. Numerous animal studies and recent clinical trials indicate that manipulating these interactions holds considerable promise for immunotherapy. With the consequences of these signals well established, and details of the downstream signalling events emerging, understanding the molecular nature of these extracellular interactions becomes crucial. Here we report the crystal structure of the human CTLA-4/B7-1 co-stimulatory complex at 3.0 A resolution. In contrast to other interacting cell-surface molecules, the relatively small CTLA-4/B7-1 binding interface exhibits an unusually high degree of shape complementarity. CTLA-4 forms homodimers through a newly defined interface of highly conserved residues. In the crystal lattice, CTLA-4 and B7-1 pack in a strikingly periodic arrangement in which bivalent CTLA-4 homodimers bridge bivalent B7-1 homodimers. This zipper-like oligomerization provides the structural basis for forming unusually stable signalling complexes at the T-cell surface, underscoring the importance of potent inhibitory signalling in human immune responses.


    Organizational Affiliation

    Departments of Biological Chemistry and Musculoskeletal Sciences, Wyeth Research, 87 Cambridge Park Drive, Cambridge, Massachusetts 02140, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
T LYMPHOCYTE ACTIVATION ANTIGEN CD80
A, B
208Homo sapiensGene Names: CD80 (CD28LG, CD28LG1, LAB7)
Find proteins for P33681 (Homo sapiens)
Go to Gene View: CD80
Go to UniProtKB:  P33681
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYTOTOXIC T-LYMPHOCYTE PROTEIN 4
C, D
126Homo sapiensGene Names: CTLA4 (CD152)
Find proteins for P16410 (Homo sapiens)
Go to Gene View: CTLA4
Go to UniProtKB:  P16410
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAN
Query on MAN

Download SDF File 
Download CCD File 
A, B
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B, C, D
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.229 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 88.600α = 90.00
b = 183.238β = 90.00
c = 230.726γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
CNSrefinement
DENZOdata reduction
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: Non-polymer description, Version format compliance