4PXM

The Estrogen Receptor Alpha Ligand Binding Domain D538G Mutant in Complex with Estradiol and a glucocorticoid receptor-interacting protein 1 NR box II peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Estrogen receptor alpha somatic mutations Y537S and D538G confer breast cancer endocrine resistance by stabilizing the activating function-2 binding conformation.

Fanning, S.W.Mayne, C.G.Dharmarajan, V.Carlson, K.E.Martin, T.A.Novick, S.J.Toy, W.Green, B.Panchamukhi, S.Katzenellenbogen, B.S.Tajkhorshid, E.Griffin, P.R.Shen, Y.Chandarlapaty, S.Katzenellenbogen, J.A.Greene, G.L.

(2016) Elife 5: --

  • DOI: 10.7554/eLife.12792
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Somatic mutations in the estrogen receptor alpha (ERα) gene (ESR1), especially Y537S and D538G, have been linked to acquired resistance to endocrine therapies. Cell-based studies demonstrated that these mutants confer ERα constitutive activity and an ...

    Somatic mutations in the estrogen receptor alpha (ERα) gene (ESR1), especially Y537S and D538G, have been linked to acquired resistance to endocrine therapies. Cell-based studies demonstrated that these mutants confer ERα constitutive activity and antiestrogen resistance and suggest that ligand-binding domain dysfunction leads to endocrine therapy resistance. Here, we integrate biophysical and structural biology data to reveal how these mutations lead to a constitutively active and antiestrogen-resistant ERα. We show that these mutant ERs recruit coactivator in the absence of hormone while their affinities for estrogen agonist (estradiol) and antagonist (4-hydroxytamoxifen) are reduced. Further, they confer antiestrogen resistance by altering the conformational dynamics of the loop connecting Helix 11 and Helix 12 in the ligand-binding domain of ERα, which leads to a stabilized agonist state and an altered antagonist state that resists inhibition.


    Organizational Affiliation

    Department of Molecular Therapeutics, The Scripps Research Institute, Jupiter, United States.,Department of Molecular and Integrative Physiology, University of Illinois Urbana-Champaign, Urbana, United States.,Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, United States.,Department of Biochemistry, Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, United States.,Department of Electrical and Computer Engineering, TEES-AgriLife Center for Bioinformatics and Genomic Systems Engineering, Texas A&M University, College Station, United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, United States.,Human Oncology and Pathogenesis Program, Memorial Sloan Kettering Cancer Center, New York, United States.,Ben May Department for Cancer Research, University of Chicago, Chicago, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Estrogen receptor
A, B
271Homo sapiensMutation(s): 1 
Gene Names: ESR1 (ESR, NR3A1)
Find proteins for P03372 (Homo sapiens)
Go to Gene View: ESR1
Go to UniProtKB:  P03372
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nuclear receptor coactivator 2
C, D
13Homo sapiensMutation(s): 0 
Gene Names: NCOA2 (BHLHE75, SRC2, TIF2)
Find proteins for Q15596 (Homo sapiens)
Go to Gene View: NCOA2
Go to UniProtKB:  Q15596
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EST
Query on EST

Download SDF File 
Download CCD File 
A, B
ESTRADIOL
C18 H24 O2
VOXZDWNPVJITMN-ZBRFXRBCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ESTIC50: 1.9 - 2.2 nM (91) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.179 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 56.084α = 90.00
b = 84.182β = 108.83
c = 58.372γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data scaling
HKL-3000data reduction
HKL-3000data collection
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-04-08
    Type: Initial release
  • Version 1.1: 2016-02-24
    Type: Database references
  • Version 1.2: 2017-05-17
    Type: Structure summary