9B2B | pdb_00009b2b

Estrogen Receptor Alpha Ligand Binding Domain in Complex with a Complete Estrogen Receptor Antagonists that Favors Tetramer Formation

• PDB DOI: https://doi.org/10.2210/pdb9B2B/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2024-03-14 Released: 2025-08-27 
• Deposition Author(s): Fink, E.C., Chawla, R., Wells, K.S., Barratt, S., Myles, D.C., Pena, G., Robello, B.W., Ng, R., Fanning, S.W.
• Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.08 Å
• R-Value Free: 
  0.318 (Depositor), 0.321 (DCC) 
• R-Value Work: 
  0.259 (Depositor), 0.264 (DCC) 
• R-Value Observed: 
  0.262 (Depositor) 

Starting Model: experimental

Literature

Estrogen Receptor Alpha Ligand Binding Domain in Complex with a Complete Estrogen Receptor Antagonists that Favors Tetramer Formation

Fanning, S.W.

To be published.

Biological Assembly 1  

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

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

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 118.3 kDa 
• Atom Count: 7,588 
• Modeled Residue Count: 895 
• Deposited Residue Count: 1,020 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Estrogen receptor	A, B, C, D	255	Homo sapiens	Mutation(s): 4  Gene Names: ESR1, ESR, NR3A1
UniProt & NIH Common Fund Data Resources
Find proteins for P03372 (Homo sapiens) Explore P03372  Go to UniProtKB:  P03372
PHAROS:  P03372 GTEx:  ENSG00000091831

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
A1AI0 (Subject of Investigation/LOI)	E [auth A], F [auth B], G [auth C], H [auth D]	2-chloro-3-{[{[1-(2-fluorophenyl)cyclopentyl]methyl}(4-{[1-(3-fluoropropyl)azetidin-3-yl]oxy}phenyl)amino]methyl}phenol C31 H35 Cl F2 N2 O2 IQQNTEIXXROPQR-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.08 Å
• R-Value Free:  0.318 (Depositor), 0.321 (DCC) 
• R-Value Work:  0.259 (Depositor), 0.264 (DCC) 
• R-Value Observed: 0.262 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.097	α = 90
b = 57.419	β = 102.16
c = 174.803	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-3000	data reduction
HKL-3000	data scaling
HKL-3000	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-08-27 
Deposition Author(s): Fink, E.C., Chawla, R., Wells, K.S., Barratt, S., Myles, D.C., Pena, G., Robello, B.W., Ng, R., Fanning, S.W.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)	United States	CA279341

Revision History  

• Version 1.0: 2025-08-27
  Type: Initial release