1I8L

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

• PDB DOI: https://doi.org/10.2210/pdb1I8L/pdb

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): No 


• Deposited: 2001-03-14 Released: 2001-04-04 
• Deposition Author(s): Stamper, C.C., Somers, W.S., Mosyak, L.

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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 

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 79.09 kDa 
• Atom Count: 5,108 
• Modelled Residue Count: 634 
• Deposited Residue Count: 668 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
T LYMPHOCYTE ACTIVATION ANTIGEN CD80	A, B	208	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P33681 (Homo sapiens) Explore P33681  Go to UniProtKB:  P33681
PHAROS:  P33681 GTEx:  ENSG00000121594

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CYTOTOXIC T-LYMPHOCYTE PROTEIN 4	C, D	126	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P16410 (Homo sapiens) Explore P16410  Go to UniProtKB:  P16410
PHAROS:  P16410 GTEx:  ENSG00000163599

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	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
MAN	I [auth A], Q [auth B]	alpha-D-mannopyranose C6 H12 O6 WQZGKKKJIJFFOK-PQMKYFCFSA-N

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 = 88.6	α = 90
b = 183.238	β = 90
c = 230.726	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-04-04 
Deposition Author(s): Stamper, C.C., Somers, W.S., Mosyak, L.

Revision History  

• 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
• Version 1.4: 2024-04-03
  Changes: Data collection, Database references, Refinement description, Structure summary