Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 18.96 kDa 
• Atom Count: 1598 
• Modelled Residue Count: 155 
• Deposited Residue Count: 160 
• Unique protein chains: 1

2ILK

CRYSTAL STRUCTURE OF HUMAN INTERLEUKIN-10 AT 1.6 ANGSTROMS RESOLUTION

• PDB DOI: 10.2210/pdb2ILK/pdb

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


• Deposited: 1996-07-01 Released: 1996-10-14 
• Deposition Author(s): Zdanov, A., Schalk-Hihi, C., Wlodawer, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å

Literature

Crystal structure of human interleukin-10 at 1.6 A resolution and a model of a complex with its soluble receptor.

Zdanov, A., Schalk-Hihi, C., Wlodawer, A.

(1996) Protein Sci 5: 1955-1962

• PubMed: 8897595 
• DOI: 10.1002/pro.5560051001
• Primary Citation of Related Structures:  
  2ILK


• PubMed Abstract: 
  

The crystal structure of human interleukin-10 (IL-10) was refined at 1.6 A resolution against X-ray diffraction data collected at 100 K with the use of synchrotron radiation. Although similar to the IL-10 structure determined previously at room temperature, this low-temperature IL-10 structure contains, in addition, four N-terminal residues, three sulfate anions, and 175 extra water molecules. Whereas the main-chain conformation is preserved, about 30% of the side chains, most of them on the protein surface, assume different conformations. A computer model of a complex of IL-10 with its two soluble receptors was generated based on the topological similarity of IL-10 to interferon-gamma. The contact region between the cytokine and each receptor shows excellent complementarity of polar and hydrophobic interactions, suggesting that the model is generally correct and should be useful in guiding mutagenesis experiments.

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Related Citations: 

• Crystal Structure of Interleukin-10 Reveals the Functional Dimer with an Unexpected Topological Similarity to Interferon Gamma
  Zdanov, A., Schalk-Hihi, C., Gustchina, A., Tsang, M., Weatherbee, J., Wlodawer, A.
  (1995) Structure 3: 591

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Organizational Affiliation: 

Macromolecular Structure Laboratory, NCI-Frederick Cancer Research and Development Center, ABL-Basic Research Program, Frederick, Maryland 21702, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INTERLEUKIN-10	A	160	Homo sapiens	Mutation(s): 0  Gene Names: IL10
UniProt & NIH Common Fund Data Resources
Find proteins for P22301 (Homo sapiens) Explore P22301  Go to UniProtKB:  P22301
PHAROS:  P22301

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.53	α = 90
b = 69.53	β = 90
c = 70.54	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PROFFT	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-07-01 
• Released Date: 1996-10-14 
Deposition Author(s): Zdanov, A., Schalk-Hihi, C., Wlodawer, A.

Revision History  

• Version 1.0: 1996-10-14
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance