8DU6

Estrogen Receptor Alpha Ligand Binding Domain in Complex with (1'-(4-((1-ethylazetidin-3-yl)oxy)phenyl)-6'-hydroxy-1',4'-dihydro-2'<i>H</i>-spiro[cyclopropane-1,3'-isoquinolin]-2'-yl)(phenyl)methanone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Unconventional isoquinoline-based SERMs elicit fulvestrant-like transcriptional programs in ER+ breast cancer cells.

Hancock, G.R.Young, K.S.Hosfield, D.J.Joiner, C.Sullivan, E.A.Yildiz, Y.Laine, M.Greene, G.L.Fanning, S.W.

(2022) NPJ Breast Cancer 8: 130-130

  • DOI: https://doi.org/10.1038/s41523-022-00497-9
  • Primary Citation of Related Structures:  
    7TE7, 8DU6, 8DU8, 8DU9, 8DUB, 8DUC, 8DUD, 8DUG, 8DUH, 8DUI, 8DUK, 8DUS, 8DV5, 8DV7, 8DV8, 8DVB

  • PubMed Abstract: 

    Estrogen receptor alpha (ERα) is a ligand-dependent master transcriptional regulator and key driver of breast cancer pathology. Small molecule hormones and competitive antagonists favor unique ERα conformational ensembles that elicit ligand-specific transcriptional programs in breast cancer and other hormone-responsive tissues. By affecting disparate ligand binding domain structural features, unconventional ligand scaffolds can redirect ERα genomic binding patterns to engage novel therapeutic transcriptional programs. To improve our understanding of these ERα structure-transcriptional relationships, we develop a series of chemically unconventional antagonists based on the antiestrogens elacestrant and lasofoxifene. High-resolution x-ray co-crystal structures show that these molecules affect both classical and unique structural motifs within the ERα ligand binding pocket. They show moderately reduced antagonistic potencies on ERα genomic activities but are effective anti-proliferative agents in luminal breast cancer cells. Interestingly, they favor a 4-hydroxytamoxifen-like accumulation of ERα in breast cancer cells but lack uterotrophic activities in an endometrial cell line. Importantly, RNA sequencing shows that the lead molecules engage transcriptional pathways similar to the selective estrogen receptor degrader fulvestrant. This advance shows that fulvestrant-like genomic activities can be achieved without affecting ERα accumulation in breast cancer cells.


  • Organizational Affiliation

    Department of Cancer Biology, Loyola University Chicago, Stritch School of Medicine, Maywood, IL, 60153, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Estrogen receptor
A, B
255Homo sapiensMutation(s): 4 
Gene Names: ESR1ESRNR3A1
UniProt & NIH Common Fund Data Resources
Find proteins for P03372 (Homo sapiens)
Explore P03372 
Go to UniProtKB:  P03372
PHAROS:  P03372
GTEx:  ENSG00000091831 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03372
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
TQF (Subject of Investigation/LOI)
Query on TQF

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
[(1'R)-1'-{4-[(1-ethylazetidin-3-yl)oxy]phenyl}-6'-hydroxy-1',4'-dihydro-2'H-spiro[cyclopropane-1,3'-isoquinolin]-2'-yl](phenyl)methanone
C29 H30 N2 O3
KYSPUCBQKNTERK-HHHXNRCGSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.28α = 90
b = 58.37β = 103.12
c = 87.657γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-3000data reduction
HKL-3000data scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-09
    Type: Initial release
  • Version 1.1: 2023-05-24
    Changes: Database references
  • Version 1.2: 2023-10-25
    Changes: Data collection, Refinement description