Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 4-mer - A2B Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 59.50 kDa 
• Atom Count: 4192 
• Residue Count: 503 
• Unique protein chains: 2

1GWQ

HUMAN OESTROGEN RECEPTOR ALPHA LIGAND-BINDING DOMAIN IN COMPLEX WITH RALOXIFENE CORE AND TIF2 NRBOX2 PEPTIDE

• DOI: 10.2210/pdb1GWQ/pdb

• Classification: NUCLEAR RECEPTOR
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-03-22 Released: 2002-08-29 
• Deposition Author(s): Pike, A.C.W., Brzozowski, A.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.269 
• R-Value Work: 0.206 

Literature

Interaction of Transcriptional Intermediary Factor 2 Nuclear Receptor Box Peptides with the Coactivator Binding Site of Estrogen Receptor Alpha.

Warnmark, A., Treuter, E., Gustafsson, J.-A., Hubbard, R.E., Brzozowski, A.M., Pike, A.C.W.

(2002) J Biol Chem 277: 21862

• PubMed: 11937504 
• DOI: 10.1074/jbc.M200764200
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The activation function 2/ligand-dependent interaction between nuclear receptors and their coregulators is mediated by a short consensus motif, the so-called nuclear receptor (NR) box. Nuclear receptors exhibit distinct preferences for such motifs depending both on the bound ligand and on the NR box sequence. To better understand the structural basis of motif recognition, we characterized the interaction between estrogen receptor alpha and the NR box regions of the p160 coactivator TIF2. We have determined the crystal structures of complexes between the ligand-binding domain of estrogen receptor alpha and 12-mer peptides from the Box B2 and Box B3 regions of TIF2. Surprisingly, the Box B3 module displays an unexpected binding mode that is distinct from the canonical LXXLL interaction observed in other ligand-binding domain/NR box crystal structures. The peptide is shifted along the coactivator binding site in such a way that the interaction motif becomes LXXYL rather than the classical LXXLL. However, analysis of the binding properties of wild type NR box peptides, as well as mutant peptides designed to probe the Box B3 orientation, suggests that the Box B3 peptide primarily adopts the "classical" LXXLL orientation in solution. These results highlight the potential difficulties in interpretation of protein-protein interactions based on co-crystal structures using short peptide motifs.

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Related Citations: 

• Molecular Basis of Agonism and Antagonism in the Oestrogen Receptor
  Brzozowski, A.M., Pike, A.C., Dauter, Z., Hubbard, R.E., Bonn, T., Engstrom, O., Ohman, L., Greene, G.L., Gustafsson, J.A., Carlquist, M.
  (1997) Nature 389: 753

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Organizational Affiliation: 

Department of Biosciences at Novum, Karolinska Institutet, S-14157 Huddinge, Sweden.

Macromolecules

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
NUCLEAR RECEPTOR COACTIVATOR 2	C, D	9	Homo sapiens	Mutation(s): 0  Gene Names: NCOA2, BHLHE75, SRC2, TIF2
Find proteins for Q15596 (Homo sapiens) Go to UniProtKB:  Q15596
NIH Common Fund Data Resources
PHAROS  Q15596 GTEx  ENSG00000140396

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
OESTROGEN RECEPTOR	A, B	248	Homo sapiens	Mutation(s): 0  Gene Names: ESR1, ESR, NR3A1
Find proteins for P03372 (Homo sapiens) Go to UniProtKB:  P03372
NIH Common Fund Data Resources
PHAROS  P03372 GTEx  ENSG00000091831

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZTW	A, B	RALOXIFENE CORE C14 H10 O2 S MDGWZLQPNOETLH-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
ZTW	EC50:  1400   nM  BindingDB
ZTW	IC50:  1410   nM  BindingDB
ZTW	EC50:  50   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.269 
• R-Value Work: 0.206 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.82	α = 90
b = 63.62	β = 98.34
c = 74.72	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-03-22 
• Released Date: 2002-08-29 
Deposition Author(s): Pike, A.C.W., Brzozowski, A.M.

Revision History 

• Version 1.0: 2002-08-29
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2020-03-11
  Changes: Advisory, Derived calculations, Other