Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 6-mer - A2B2C2 

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

Macromolecule Content

• Total Structure Weight: 78.25 kDa 
• Atom Count: 5322 
• Modelled Residue Count: 662 
• Deposited Residue Count: 686 
• Unique protein chains: 3

1P9M

Crystal structure of the hexameric human IL-6/IL-6 alpha receptor/gp130 complex

• DOI: 10.2210/pdb1P9M/pdb

• Classification: signaling protein/cytokine
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2003-05-12 Released: 2003-07-01 
• Deposition Author(s): Boulanger, M.J., Chow, D.C., Brevnova, E.E., Garcia, K.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.65 Å
• R-Value Free: 0.334 
• R-Value Work: 0.282 
• R-Value Observed: 0.282 

Literature

Hexameric Structure and Assembly of the Interleukin-6/IL-6 alpha-Receptor/gp130 Complex

Boulanger, M.J., Chow, D.C., Brevnova, E.E., Garcia, K.C.

(2003) Science 300: 2101-2104

• PubMed: 12829785 
• DOI: 10.1126/science.1083901
• Primary Citation of Related Structures:  
  1P9M


• PubMed Abstract: 
  

Interleukin-6 (IL-6) is an immunoregulatory cytokine that activates a cell-surface signaling assembly composed of IL-6, the IL-6 alpha-receptor (IL-6Ralpha), and the shared signaling receptor gp130. The 3.65 angstrom-resolution structure of the extracellular signaling complex reveals a hexameric, interlocking assembly mediated by a total of 10 symmetry-related, thermodynamically coupled interfaces. Assembly of the hexameric complex occurs sequentially: IL-6 is first engaged by IL-6Ralpha and then presented to gp130in the proper geometry to facilitate a cooperative transition into the high-affinity, signaling-competent hexamer. The quaternary structures of other IL-6/IL-12 family signaling complexes are likely constructed by means of a similar topological blueprint.

---

Organizational Affiliation: 

Department of Microbiology and Immunology and Department of Structural Biology, Stanford University School of Medicine, Fairchild D319, 299 Campus Drive, Stanford, CA 94305-5124, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Interleukin-6 receptor beta chain	A	299	Homo sapiens	Mutation(s): 0  Gene Names: IL6ST
Find proteins for P40189 (Homo sapiens) Explore P40189  Go to UniProtKB:  P40189
NIH Common Fund Data Resources
PHAROS:  P40189 GTEx:  ENSG00000134352

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Interleukin-6	B	186	Homo sapiens	Mutation(s): 0  Gene Names: IL6 OR IFNB2, IL6, IFNB2
Find proteins for P05231 (Homo sapiens) Explore P05231  Go to UniProtKB:  P05231
NIH Common Fund Data Resources
PHAROS:  P05231 GTEx:  ENSG00000136244

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Interleukin-6 receptor alpha chain	C	201	Homo sapiens	Mutation(s): 0  Gene Names: IL6R
Find proteins for P08887 (Homo sapiens) Explore P08887  Go to UniProtKB:  P08887
NIH Common Fund Data Resources
PHAROS:  P08887 GTEx:  ENSG00000160712

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.65 Å
• R-Value Free: 0.334 
• R-Value Work: 0.282 
• R-Value Observed: 0.282 
• Space Group: H 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 279.8	α = 90
b = 279.8	β = 90
c = 96.7	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-05-12 
• Released Date: 2003-07-01 
Deposition Author(s): Boulanger, M.J., Chow, D.C., Brevnova, E.E., Garcia, K.C.

Revision History  

• Version 1.0: 2003-07-01
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance