3BX7

Engineered Human Lipocalin 2 (LCN2) in Complex with the Extracellular Domain of Human CTLA-4

• PDB DOI: https://doi.org/10.2210/pdb3BX7/pdb

• Classification: DE NOVO PROTEIN, PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-01-11 Released: 2009-01-20 
• Deposition Author(s): Schonfeld, D.L., Chatwell, L., Skerra, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.226 
• R-Value Work: 0.209 

Starting Models: experimental

Literature

High affinity molecular recognition and functional blockade of CTLA-4 by an engineered human lipocalin

Schonfeld, D.L., Matschiner, G., Chatwell, L., Trentmann, S., Schlehuber, S., Hohlbaum, A., Skerra, A.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 33.5 kDa 
• Atom Count: 2,473 
• Modelled Residue Count: 293 
• Deposited Residue Count: 302 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CYTOTOXIC T-LYMPHOCYTE-ASSOCIATED ANTIGEN 4	A [auth C]	124	Homo sapiens	Mutation(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 GTEx:  ENSG00000163599

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
ENGINEERED HUMAN LIPOCALIN 2	B [auth A]	178	Homo sapiens	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.226 
• R-Value Work: 0.209 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 120.706	α = 90
b = 120.706	β = 90
c = 82.957	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-01-20 
Deposition Author(s): Schonfeld, D.L., Chatwell, L., Skerra, A.

Revision History  

• Version 1.0: 2009-01-20
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-08-30
  Changes: Data collection, Database references, Refinement description
• Version 1.3: 2024-10-09
  Changes: Structure summary