Biological Assembly 1  

 3D View: Structure

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B 

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

Macromolecule Content

• Total Structure Weight: 38.73 
• Atom Count: 2795 
• Residue Count: 317 
• Unique protein chains: 2

1IAR

INTERLEUKIN-4 / RECEPTOR ALPHA CHAIN COMPLEX

• DOI: 10.2210/pdb1IAR/pdb

• Classification: CYTOKINE/RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1999-02-25 Released: 2000-03-03 
• Deposition Author(s): Hage, T., Sebald, W., Reinemer, P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.289 
• R-Value Work: 0.218 

Literature

Crystal structure of the interleukin-4/receptor alpha chain complex reveals a mosaic binding interface.

Hage, T., Sebald, W., Reinemer, P.

(1999) Cell 97: 271-281

• PubMed: 10219247 
• DOI: 10.1016/s0092-8674(00)80736-9
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Interleukin-4 (IL-4) is a principal regulatory cytokine during an immune response and a crucial determinant for allergy and asthma. IL-4 binds with high affinity and specificity to the ectodomain of the IL-4 receptor alpha chain (IL4-BP). Subsequently, this intermediate complex recruits the common gamma chain (gamma c), thereby initiating transmembrane signaling. The crystal structure of the intermediate complex between human IL-4 and IL4-BP was determined at 2.3 A resolution. It reveals a novel spatial orientation of the two proteins, a small but unexpected conformational change in the receptor-bound IL-4, and an interface with three separate clusters of trans-interacting residues. Novel insights on ligand binding in the cytokine receptor family and a paradigm for receptors of IL-2, IL-7, IL-9, and IL-15, which all utilize gamma c, are provided.

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Related Citations: 

• Crystals of a 1:1 complex between human interleukin-4 and the extracellular domain of its receptor alpha chain.
  Hage, T., Reinemer, P., Sebald, W.
  (1998) Eur J Biochem 258: 831

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Organizational Affiliation: 

Institut für Physiologische Chemie II, Theodor-Boveri-Institut für Biowissen Schaften (Biozentrum), Universität Würzburg, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (INTERLEUKIN-4)	A	129	Homo sapiens	Mutation(s): 0  Gene Names: IL4
Find proteins for P05112 (Homo sapiens) Go to UniProtKB:  P05112
NIH Common Fund Data Resources
PHAROS  P05112 GTEx  ENSG00000113520

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (INTERLEUKIN-4 RECEPTOR ALPHA CHAIN)	B	207	Homo sapiens	Mutation(s): 2  Gene Names: IL4R, IL4RA, 582J2.1
Find proteins for P24394 (Homo sapiens) Go to UniProtKB:  P24394
NIH Common Fund Data Resources
PHAROS  P24394 GTEx  ENSG00000077238

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.289 
• R-Value Work: 0.218 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.72	α = 90
b = 67.98	β = 90
c = 108.46	γ = 90

Software Package:

Software Name	Purpose
MOSFLM	data reduction
ROTAVATA/AGROVATA	data reduction
MLPHARE	phasing
X-PLOR	refinement
CCP4	data scaling
ROTAVATA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-02-25 
• Released Date: 2000-03-03 
Deposition Author(s): Hage, T., Sebald, W., Reinemer, P.

Revision History 

• Version 1.0: 2000-03-03
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description
• Version 1.4: 2018-03-14
  Changes: Database references
• Version 1.5: 2019-11-06
  Changes: Data collection, Database references