Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 24.79 kDa 
• Atom Count: 1775 
• Modelled Residue Count: 216 
• Deposited Residue Count: 216 
• Unique protein chains: 1

1HUL

A NOVEL DIMER CONFIGURATION REVEALED BY THE CRYSTAL STRUCTURE AT 2.4 ANGSTROMS RESOLUTION OF HUMAN INTERLEUKIN-5

• PDB DOI: 10.2210/pdb1HUL/pdb

• Classification: CYTOKINE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1995-03-17 Released: 1995-12-07 
• Deposition Author(s): Milburn, M.V.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.369 
• R-Value Work: 0.213 
• R-Value Observed: 0.213 

Literature

A novel dimer configuration revealed by the crystal structure at 2.4 A resolution of human interleukin-5.

Milburn, M.V., Hassell, A.M., Lambert, M.H., Jordan, S.R., Proudfoot, A.E., Graber, P., Wells, T.N.

(1993) Nature 363: 172-176

• PubMed: 8483502 
• DOI: 10.1038/363172a0
• Primary Citation of Related Structures:  
  1HUL


• PubMed Abstract: 
  

Interleukin-5 (IL-5) is a lineage-specific cytokine for eosinophilpoiesis and plays an important part in diseases associated with increased eosinophils, such as asthma. Human IL-5 is a disulphide-linked homodimer with 115 amino-acid residues in each chain. The crystal structure at 2.4 A resolution reveals a novel two-domain structure, with each domain showing a striking similarity to the cytokine fold found in granulocyte macrophage and macrophage colony-stimulating factors, IL-2 (ref. 5), IL-4 (ref. 6), and human and porcine growth hormones. IL-5 is unique in that each domain requires the participation of two chains. The IL-5 structure consists of two left-handed bundles of four helices laid end to end and two short beta-sheets on opposite sides of the molecule. Surprisingly, the C-terminal strand and helix of one chain complete a bundle of four helices and a beta-sheet with the N-terminal three helices and one strand of the other chain. The structure of IL-5 provides a molecular basis for the design of antagonists and agonists that would delineate receptor recognition determinants critical in signal transduction. This structure determination extends the family of the cytokine bundle of four helices and emphasizes its fundamental significance and versatility in recognizing its receptor.

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Organizational Affiliation: 

Laboratory of Molecular Medicine, Children's Hospital/Ender 673, Boston, Massachusetts 02115-5737.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INTERLEUKIN-5	A, B	108	Homo sapiens	Mutation(s): 0  Gene Names: IL5
UniProt & NIH Common Fund Data Resources
Find proteins for P05113 (Homo sapiens) Explore P05113  Go to UniProtKB:  P05113
PHAROS:  P05113

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.369 
• R-Value Work: 0.213 
• R-Value Observed: 0.213 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 122.1	α = 90
b = 36.11	β = 98.59
c = 56.42	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-03-17 
• Released Date: 1995-12-07 
Deposition Author(s): Milburn, M.V.

Revision History  

• Version 1.0: 1995-12-07
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance