Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 57930.67 
• Atom Count: 3327 
• Residue Count: 503 
• Unique protein chains: 2

1F45

HUMAN INTERLEUKIN-12

• DOI: 10.2210/pdb1F45/pdb

• Classification: CYTOKINE/CYTOKINE
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): 1 


• Deposited: 2000-06-07 Released: 2001-06-20 
• Deposition Author(s): Yoon, C., Johnston, S.C., Tang, J., Tobin, J.F., Somers, W.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.284 
• R-Value Work: 0.241 

Literature

Charged residues dominate a unique interlocking topography in the heterodimeric cytokine interleukin-12.

Yoon, C., Johnston, S.C., Tang, J., Stahl, M., Tobin, J.F., Somers, W.S.

(2000) EMBO J. 19: 3530-3541

• PubMed: 10899108 
• DOI: 10.1093/emboj/19.14.3530
• Primary Citation of Related Structures:  
  1F42


• PubMed Abstract: 
  

Human interleukin-12 (IL-12, p70) is an early pro-inflammatory cytokine, comprising two disulfide-linked subunits, p35 and p40. We solved the crystal structures of monomeric human p40 at 2.5 A and the human p70 complex at 2.8 A resolution, which reveals that IL-12 is similar to class 1 cytokine-receptor complexes. They also include the first description of an N-terminal immunoglobulin-like domain, found on the p40 subunit. Several charged residues from p35 and p40 intercalate to form a unique interlocking topography, shown by mutagenesis to be critical for p70 formation. A central arginine residue from p35 projects into a deep pocket on p40, which may be an ideal target for a small molecule antagonist of IL-12 formation.

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Organizational Affiliation: 

Departments of Musculoskeletal Sciences and Biological Chemistry, Wyeth Research, 87 Cambridge Park Drive, Cambridge, MA 02140, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
INTERLEUKIN-12 BETA CHAIN	A	306	Homo sapiens	Mutation(s): 0  Gene Names: IL12B (NKSF2)
Find proteins for P29460 (Homo sapiens) Go to Gene View: IL12B Go to UniProtKB:  P29460

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
INTERLEUKIN-12 ALPHA CHAIN	B	197	Homo sapiens	Mutation(s): 1  Gene Names: IL12A (NKSF1)
Find proteins for P29459 (Homo sapiens) Go to Gene View: IL12A Go to UniProtKB:  P29459

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MAN	A	ALPHA-D-MANNOSE C6 H12 O6 WQZGKKKJIJFFOK-PQMKYFCFSA-N
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.284 
• R-Value Work: 0.241 
• Space Group: C 2 2 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 112.900	α = 90.00
b = 154.200	β = 90.00
c = 101.700	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
MLPHARE	phasing
SCALEPACK	data scaling
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-06-07 
• Released Date: 2001-06-20 
• Deposition Author(s): Yoon, C., Johnston, S.C., Tang, J., Tobin, J.F., Somers, W.S.

Revision History 

• Version 1.0: 2001-06-20
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance