Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 15.16 kDa 
• Atom Count: 1182 
• Residue Count: 129 
• Unique protein chains: 1

2B91

Crystal structure of the interleukin-4 variant F82DR85A

• DOI: 10.2210/pdb2B91/pdb

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


• Deposited: 2005-10-10 Released: 2006-05-30 
• Deposition Author(s): Kraich, M., Klein, M., Patino, E., Harrer, H., Sebald, W., Mueller, T.D.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.258 
• R-Value Work: 0.205 
• R-Value Observed: 0.208 

Literature

A modular interface of IL-4 allows for scalable affinity without affecting specificity for the IL-4 receptor

Kraich, M., Klein, M., Patino, E., Harrer, H., Nickel, J., Sebald, W., Mueller, T.D.

(2006) BMC Biol 4: 13-13

• PubMed: 16640778 
• DOI: 10.1186/1741-7007-4-13
• Primary Citation of Related Structures:  
  2D48, 2B8Z, 2B8Y, 2B8X, 2B90, 2B8U, 2B91


• PubMed Abstract: 
  

Interleukin 4 (IL-4) is a key regulator of the immune system and an important factor in the development of allergic hypersensitivity. Together with interleukin 13 (IL-13), IL-4 plays an important role in exacerbating allergic and asthmatic symptoms. For signal transduction, both cytokines can utilise the same receptor, consisting of the IL-4Ralpha and the IL-13Ralpha1 chain, offering an explanation for their overlapping biological functions. Since both cytokine ligands share only moderate similarity on the amino acid sequence level, molecular recognition of the ligands by both receptor subunits is of great interest. IL-4 and IL-13 are interesting targets for allergy and asthma therapies. Knowledge of the binding mechanism will be important for the generation of either IL-4 or IL-13 specific drugs.

---

Organizational Affiliation: 

Lehrstuhl für Physiologische Chemie II, Theodor-Boveri Institut für Biowissenschaften (Biozentrum) der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Interleukin-4	A	129	Homo sapiens	Mutation(s): 2  Gene Names: IL4
Find proteins for P05112 (Homo sapiens) Explore P05112  Go to UniProtKB:  P05112
NIH Common Fund Data Resources
PHAROS:  P05112 GTEx:  ENSG00000113520

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.258 
• R-Value Work: 0.205 
• R-Value Observed: 0.208 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 91.2	α = 90
b = 91.2	β = 90
c = 46	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
CrystalClear	data reduction
CrystalClear	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-10-10 
• Released Date: 2006-05-30 
Deposition Author(s): Kraich, M., Klein, M., Patino, E., Harrer, H., Sebald, W., Mueller, T.D.

Revision History 

• Version 1.0: 2006-05-30
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance