Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 28569.55 
• Atom Count: 2000 
• Residue Count: 248 
• Unique protein chains: 1

1QKT

MUTANT ESTROGEN NUCLEAR RECEPTOR LIGAND BINDING DOMAIN COMPLEXED WITH ESTRADIOL

• DOI: 10.2210/pdb1QKT/pdb

• Classification: NUCLEAR RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): 3 


• Deposited: 1999-08-05 Released: 2000-08-18 
• Deposition Author(s): Ruff, M., Gangloff, M., Eiler, S., Duclaud, S., Wurtz, J.M., Moras, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.273 
• R-Value Work: 0.223 

Literature

Crystal Structure of a Mutant Heralpha Ligand- Binding Domain Reveals Key Structural Features for the Mechanism of Partial Agonism

Gangloff, M., Ruff, M., Eiler, S., Duclaud, S., Wurtz, J.M., Moras, D.

(2001) J.Biol.Chem. 276: 15059

• PubMed: 11278577 
• DOI: 10.1074/jbc.M009870200
• Primary Citation of Related Structures:  
  1QKU


• PubMed Abstract: 
  

The crystal structure of a triple cysteine to serine mutant ERalpha ligand-binding domain (LBD), complexed with estradiol, shows that despite the presence of a tightly bound agonist ligand, the protein exhibits an antagonist-like conformation, similar to that observed in raloxifen and 4-hydroxytamoxifen-bound structures. This mutated receptor binds estradiol with wild type affinity and displays transcriptional activity upon estradiol stimulation, but with limited potency (about 50%). This partial activity is efficiently repressed in antagonist competition assays. The comparison with available LBD structures reveals key features governing the positioning of helix H12 and highlights the importance of cysteine residues in promoting an active conformation. Furthermore the present study reveals a hydrogen bond network connecting ligand binding to protein trans conformation. These observations support a dynamic view of H12 positioning, where the control of the equilibrium between two stable locations determines the partial agonist character of a given ligand.

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Organizational Affiliation: 

Institut de Genetique et de Biologie Moleculaire et Cellulaire, Laboratoire de Biologie et de Génomique Structurales 1, rue Laurent Fries, BP 163 67404 Illkirch, France.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ESTRADIOL RECEPTOR	A	248	Homo sapiens	Mutation(s): 3  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
EST	A	ESTRADIOL C18 H24 O2 VOXZDWNPVJITMN-ZBRFXRBCSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
EST	IC50: 1.9 - 2.2 nM (95) BINDINGDB
EST	Kd: 0.92 nM BINDINGMOAD
EST	Kd: 0.92 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.273 
• R-Value Work: 0.223 
• Space Group: P 6₅ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 58.610	α = 90.00
b = 58.610	β = 90.00
c = 276.020	γ = 120.00

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-08-05 
• Released Date: 2000-08-18 
• Deposition Author(s): Ruff, M., Gangloff, M., Eiler, S., Duclaud, S., Wurtz, J.M., Moras, D.

Revision History 

• Version 1.0: 2000-08-18
  Type: Initial release
• Version 1.1: 2011-08-10
  Type: Atomic model, Database references, Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Structure summary, Version format compliance