Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - ABCD Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer -A2BC 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 90010.52 
• Atom Count: 5292 
• Residue Count: 763 
• Unique protein chains: 4

2B5I

cytokine receptor complex

• DOI: 10.2210/pdb2B5I/pdb

• Classification: CYTOKINE/CYTOKINE RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Trichoplusia ni
• Mutation(s): 5 


• Deposited: 2005-09-28 Released: 2005-11-29 
• Deposition Author(s): Wang, X., Rickert, M., Garcia, K.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.269 
• R-Value Work: 0.223 

Literature

Structure of the quaternary complex of interleukin-2 with its alpha, beta, and gammac receptors.

Wang, X., Rickert, M., Garcia, K.C.

(2005) Science 310: 1159-1163

• PubMed: 16293754 
• DOI: 10.1126/science.1117893


• PubMed Abstract: 
  

Interleukin-2 (IL-2) is an immunoregulatory cytokine that acts through a quaternary receptor signaling complex containing alpha (IL-2Ralpha), beta (IL-2Rbeta), and common gamma chain (gc) receptors. In the structure of the quaternary ectodomain complex as visualized at a resolution of 2.3 angstroms, the binding of IL-2Ralpha to IL-2 stabilizes a secondary binding site for presentation to IL-2Rbeta. gammac is then recruited to the composite surface formed by the IL-2/IL-2Rbeta complex. Consistent with its role as a shared receptor for IL-4, IL-7, IL-9, IL-15, and IL-21, gammac forms degenerate contacts with IL-2. The structure of gammac provides a rationale for loss-of-function mutations found in patients with X-linked severe combined immunodeficiency diseases (X-SCID). This complex structure provides a framework for other gammac-dependent cytokine-receptor interactions and for the engineering of improved IL-2 therapeutics.

---

Organizational Affiliation: 

Howard Hughes Medical Institute, Department of Microbiology and Immunology, Stanford University School of Medicine, 299 Campus Drive, Fairchild D319, Stanford, CA 94305, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Interleukin-2	A	133	Homo sapiens	Gene Names: IL2
Find proteins for P60568 (Homo sapiens) Go to Gene View: IL2 Go to UniProtKB:  P60568

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Interleukin-2 receptor beta chain	B	214	Homo sapiens	Mutations: Q3N, Q17N, Q45N Gene Names: IL2RB (IL15RB)
Find proteins for P14784 (Homo sapiens) Go to Gene View: IL2RB Go to UniProtKB:  P14784

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Cytokine receptor common gamma chain	C	199	Homo sapiens	Mutations: Q20N Gene Names: IL2RG
Find proteins for P31785 (Homo sapiens) Go to Gene View: IL2RG Go to UniProtKB:  P31785

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details
Interleukin-2 receptor alpha chain	D	217	Homo sapiens	Mutations: Q68N Gene Names: IL2RA
Find proteins for P01589 (Homo sapiens) Go to Gene View: IL2RA Go to UniProtKB:  P01589

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NAG	B, C	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Free: 0.269 
• R-Value Work: 0.223 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 113.913	α = 90.00
b = 87.709	β = 116.32
c = 130.177	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
CCP4	data scaling
PHASER	phasing
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-09-28 
• Released Date: 2005-11-29 
• Deposition Author(s): Wang, X., Rickert, M., Garcia, K.C.

Revision History 

• Version 1.0: 2005-11-29
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Advisory, Version format compliance