Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 30237.73 
• Atom Count: 1991 
• Residue Count: 261 
• Unique protein chains: 1

3ERT

HUMAN ESTROGEN RECEPTOR ALPHA LIGAND-BINDING DOMAIN IN COMPLEX WITH 4-HYDROXYTAMOXIFEN

• DOI: 10.2210/pdb3ERT/pdb
• Entry 3ERT supersedes 2ERT

• Classification: NUCLEAR RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 1999-03-30 Released: 1999-04-08 
• Deposition Author(s): Shiau, A.K., Barstad, D., Loria, P.M., Cheng, L., Kushner, P.J., Agard, D.A., Greene, G.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.262 
• R-Value Work: 0.229 

Literature

The structural basis of estrogen receptor/coactivator recognition and the antagonism of this interaction by tamoxifen.

Shiau, A.K., Barstad, D., Loria, P.M., Cheng, L., Kushner, P.J., Agard, D.A., Greene, G.L.

(1998) Cell 95: 927-937

• PubMed: 9875847 
• Primary Citation of Related Structures:  
  3ERD


• PubMed Abstract: 
  

Ligand-dependent activation of transcription by nuclear receptors (NRs) is mediated by interactions with coactivators. Receptor agonists promote coactivator binding, and antagonists block coactivator binding. Here we report the crystal structure of the human estrogen receptor alpha (hER alpha) ligand-binding domain (LBD) bound to both the agonist diethylstilbestrol (DES) and a peptide derived from the NR box II region of the coactivator GRIP1 and the crystal structure of the hER alpha LBD bound to the selective antagonist 4-hydroxytamoxifen (OHT). In the DES-LBD-peptide complex, the peptide binds as a short alpha helix to a hydrophobic groove on the surface of the LBD. In the OHT-LBD complex, helix 12 occludes the coactivator recognition groove by mimicking the interactions of the NR box peptide with the LBD. These structures reveal the two distinct mechanisms by which structural features of OHT promote this "autoinhibitory" helix 12 conformation.

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Organizational Affiliation: 

Howard Hughes Medical Institute and the Department of Biochemistry and Biophysics, University of California at San Francisco, 94143-0448, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (ESTROGEN RECEPTOR ALPHA)	A	261	Homo sapiens	Mutation(s): 0  Gene Names: ESR1 (ESR, NR3A1)
Find proteins for P03372 (Homo sapiens) Go to Gene View: ESR1 Go to UniProtKB:  P03372

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
OHT	A	4-HYDROXYTAMOXIFEN C26 H29 N O2 TXUZVZSFRXZGTL-QPLCGJKRSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
OHT	Ki: 0.249 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.9 Å
• R-Value Free: 0.262 
• R-Value Work: 0.229 
• Space Group: P 6₅ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 58.242	α = 90.00
b = 58.242	β = 90.00
c = 277.467	γ = 120.00

Software Package:

Software Name	Purpose
X-PLOR	refinement
SCALEPACK	data scaling
AMoRE	phasing
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-03-30 
• Released Date: 1999-04-08 
• Deposition Author(s): Shiau, A.K., Barstad, D., Loria, P.M., Cheng, L., Kushner, P.J., Agard, D.A., Greene, G.L.
• This entry supersedes: 2ERT

Revision History 

• Version 1.0: 1999-04-08
  Type: Initial release
• Version 1.1: 2008-04-26
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2011-11-16
  Type: Atomic model