4JDD

14-3-3 protein interaction with Estrogen Receptor Alpha provides a novel drug target interface

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Interaction of 14-3-3 proteins with the estrogen receptor alpha F domain provides a drug target interface.

De Vries-van Leeuwen, I.J., da Costa Pereira, D., Flach, K.D., Piersma, S.R., Haase, C., Bier, D., Yalcin, Z., Michalides, R., Feenstra, K.A., Jimenez, C.R., de Greef, T.F., Brunsveld, L., Ottmann, C., Zwart, W., de Boer, A.H.

(2013) Proc. Natl. Acad. Sci. U.S.A. 110: 8894-8899

  • DOI: 10.1073/pnas.1220809110
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Estrogen receptor alpha (ERα) is involved in numerous physiological and pathological processes, including breast cancer. Breast cancer therapy is therefore currently directed at inhibiting the transcriptional potency of ERα, either by blocking estrog ...

    Estrogen receptor alpha (ERα) is involved in numerous physiological and pathological processes, including breast cancer. Breast cancer therapy is therefore currently directed at inhibiting the transcriptional potency of ERα, either by blocking estrogen production through aromatase inhibitors or antiestrogens that compete for hormone binding. Due to resistance, new treatment modalities are needed and as ERα dimerization is essential for its activity, interference with receptor dimerization offers a new opportunity to exploit in drug design. Here we describe a unique mechanism of how ERα dimerization is negatively controlled by interaction with 14-3-3 proteins at the extreme C terminus of the receptor. Moreover, the small-molecule fusicoccin (FC) stabilizes this ERα/14-3-3 interaction. Cocrystallization of the trimeric ERα/14-3-3/FC complex provides the structural basis for this stabilization and shows the importance of phosphorylation of the penultimate Threonine (ERα-T(594)) for high-affinity interaction. We confirm that T(594) is a distinct ERα phosphorylation site in the breast cancer cell line MCF-7 using a phospho-T(594)-specific antibody and by mass spectrometry. In line with its ERα/14-3-3 interaction stabilizing effect, fusicoccin reduces the estradiol-stimulated ERα dimerization, inhibits ERα/chromatin interactions and downstream gene expression, resulting in decreased cell proliferation. Herewith, a unique functional phosphosite and an alternative regulation mechanism of ERα are provided, together with a small molecule that selectively targets this ERα/14-3-3 interface.

    Organizational Affiliation: 

    Department of Structural Biology, Faculty Earth and Life Sciences, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14-3-3 protein sigma
A
236Homo sapiensMutation(s): 0 
Gene Names: SFN (HME1)
Find proteins for P31947 (Homo sapiens)
Go to Gene View: SFN
Go to UniProtKB:  P31947
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Estrogen receptor Peptide
B
11Homo sapiensMutation(s): 0 
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
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FSC
Query on FSC
Download SDF File 
Download CCD File 
A
FUSICOCCIN
C36 H56 O12
KXTYBXCEQOANSX-WYKQKOHHSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.192 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 82.490α = 90.00
b = 111.430β = 90.00
c = 62.240γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
PHASERphasing
MAR345dtbdata collection
XDSdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2013-02-25 
  • Released Date: 2013-05-15 
  • Deposition Author(s): Bier, D., Ottmann, C.

Revision History 

  • Version 1.0: 2013-05-15
    Type: Initial release
  • Version 1.1: 2017-06-07
    Type: Database references