Biological Assembly 1  

 3D View: Structure

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: 50.85 kDa 
• Atom Count: 3546 
• Residue Count: 454 
• Unique protein chains: 2

1EBP

COMPLEX BETWEEN THE EXTRACELLULAR DOMAIN OF ERYTHROPOIETIN (EPO) RECEPTOR [EBP] AND AN AGONIST PEPTIDE [EMP1]

• DOI: 10.2210/pdb1EBP/pdb

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


• Deposited: 1996-05-07 Released: 1997-07-29 
• Deposition Author(s): Livnah, O., Stura, E.A., Wilson, I.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.334 
• R-Value Work: 0.210 
• R-Value Observed: 0.210 

Literature

Functional mimicry of a protein hormone by a peptide agonist: the EPO receptor complex at 2.8 A.

Livnah, O., Stura, E.A., Johnson, D.L., Middleton, S.A., Mulcahy, L.S., Wrighton, N.C., Dower, W.J., Jolliffe, L.K., Wilson, I.A.

(1996) Science 273: 464-471

• PubMed: 8662530 
• DOI: 10.1126/science.273.5274.464
• Primary Citation of Related Structures:  
  1EBP


• PubMed Abstract: 
  

The functional mimicry of a protein by an unrelated small molecule has been a formidable challenge. Now, however, the biological activity of a 166-residue hematopoietic growth hormone, erythropoietin (EPO), with its class 1 cytokine receptor has been mimicked by a 20-residue cyclic peptide unrelated in sequence to the natural ligand. The crystal structure at 2.8 A resolution of a complex of this agonist peptide with the extracellular domain of EPO receptor reveals that a peptide dimer induces an almost perfect twofold dimerization of the receptor. The dimer assembly differs from that of the human growth hormone (hGH) receptor complex and suggests that more than one mode of dimerization may be able to induce signal transduction and cell proliferation. The EPO receptor binding site, defined by peptide interaction, corresponds to the smaller functional epitope identified for hGH receptor. Similarly, the EPO mimetic peptide ligand can be considered as a minimal hormone, and suggests the design of nonpeptidic small molecule mimetics for EPO and other cytokines may indeed be achievable.

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Related Citations: 

• Small Peptides as Potent Mimetics of the Protein Hormone Erythropoietin
  Wrighton, N.C., Farrell, F.X., Chang, R., Kashyap, A.K., Barbone, F.P., Mulcahy, L.S., Johnson, D.L., Barrett, R.W., Jolliffe, L.K., Dower, W.J.
  (1996) Science 273: 458

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Organizational Affiliation: 

Department of Molecular Biology and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10666 North Torrey Pines Road, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
EPO RECEPTOR	A, B	211	Homo sapiens	Mutation(s): 0  Gene Names: EPOR
Find proteins for P19235 (Homo sapiens) Explore P19235  Go to UniProtKB:  P19235
NIH Common Fund Data Resources
PHAROS:  P19235 GTEx:  ENSG00000187266

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
EPO MIMETICS PEPTIDE 1	C, D	20	N/A	Mutation(s): 0

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.334 
• R-Value Work: 0.210 
• R-Value Observed: 0.210 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.24	α = 90
b = 75.5	β = 90
c = 132.18	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: 1996-05-07 
• Released Date: 1997-07-29 
Deposition Author(s): Livnah, O., Stura, E.A., Wilson, I.A.

Revision History 

• Version 1.0: 1997-07-29
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance