Crystal Structure of the ER-alpha Ligand-binding Domain (Y537S) in Complex with the phenylamino-substituted estrogen, (8R,9S,13S,14S,17S)-13-methyl-17-(phenylamino)-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-3-ol, without a coactivator peptide

Experimental Data Snapshot

  • Resolution: 2.22 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.217 

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Structural and Molecular Mechanisms of Cytokine-Mediated Endocrine Resistance in Human Breast Cancer Cells.

Stender, J.D.Nwachukwu, J.C.Kastrati, I.Kim, Y.Strid, T.Yakir, M.Srinivasan, S.Nowak, J.Izard, T.Rangarajan, E.S.Carlson, K.E.Katzenellenbogen, J.A.Yao, X.Q.Grant, B.J.Leong, H.S.Lin, C.Y.Frasor, J.Nettles, K.W.Glass, C.K.

(2017) Mol Cell 65: 1122-1135.e5

  • DOI: https://doi.org/10.1016/j.molcel.2017.02.008
  • Primary Citation of Related Structures:  
    5U2B, 5U2D

  • PubMed Abstract: 

    Human breast cancers that exhibit high proportions of immune cells and elevated levels of pro-inflammatory cytokines predict poor prognosis. Here, we demonstrate that treatment of human MCF-7 breast cancer cells with pro-inflammatory cytokines results in ERα-dependent activation of gene expression and proliferation, in the absence of ligand or presence of 4OH-tamoxifen (TOT). Cytokine activation of ERα and endocrine resistance is dependent on phosphorylation of ERα at S305 in the hinge domain. Phosphorylation of S305 by IKKβ establishes an ERα cistrome that substantially overlaps with the estradiol (E2)-dependent ERα cistrome. Structural analyses suggest that S305-P forms a charge-linked bridge with the C-terminal F domain of ERα that enables inter-domain communication and constitutive activity from the N-terminal coactivator-binding site, revealing the structural basis of endocrine resistance. ERα therefore functions as a transcriptional effector of cytokine-induced IKKβ signaling, suggesting a mechanism through which the tumor microenvironment controls tumor progression and endocrine resistance.

  • Organizational Affiliation

    Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Estrogen receptor
A, B, C, D, E
A, B, C, D, E, F
257Homo sapiensMutation(s): 1 
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.22 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.217 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.584α = 83.11
b = 64.44β = 75.2
c = 135.406γ = 61.99
Software Package:
Software NamePurpose
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-26
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Refinement description
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references