1I8L

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

wwPDB Validation   3D Report Full Report


This is version 1.3 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: https://doi.org/10.1038/35069118
  • Primary Citation of Related Structures:  
    1I8L

  • 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 the T-cell response, whereas CTLA-4 signalling attenuates it ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
T LYMPHOCYTE ACTIVATION ANTIGEN CD80A, B208Homo sapiensMutation(s): 0 
Gene Names: CD80, CD28LG, CD28LG1, LAB7
UniProt & NIH Common Fund Data Resources
Find proteins for P33681 (Homo sapiens)
Explore P33681 
Go to UniProtKB:  P33681
PHAROS:  P33681
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33681
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CYTOTOXIC T-LYMPHOCYTE PROTEIN 4C, D126Homo sapiensMutation(s): 0 
Gene Names: CTLA4, CD152
UniProt & NIH Common Fund Data Resources
Find proteins for P16410 (Homo sapiens)
Explore P16410 
Go to UniProtKB:  P16410
PHAROS:  P16410
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16410
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A],
H [auth A],
J [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth C],
V [auth C],
W [auth D],
X [auth D]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
MAN
Query on MAN
Download Ideal Coordinates CCD File 
I [auth A],
Q [auth B]		alpha-D-mannopyranose
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.6α = 90
b = 183.238β = 90
c = 230.726γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-04-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary