Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 29.18 kDa 
• Atom Count: 1974 
• Residue Count: 246 
• Unique protein chains: 2

5GTR

estrogen receptor alpha in complex with a stabilized peptide antagonist 6

• DOI: 10.2210/pdb5GTR/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens, unidentified
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2016-08-23 Released: 2017-08-30 
• Deposition Author(s): Xie, M., Wang, T., Li, Z.-G.
• Funding Organization(s): National Natural Science Foundation of China

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.367 
• R-Value Work: 0.221 
• R-Value Observed: 0.228 

Literature

Structural Basis of Inhibition of ER alpha-Coactivator Interaction by High-Affinity N-Terminus Isoaspartic Acid Tethered Helical Peptides

Xie, M., Zhao, H., Liu, Q., Zhu, Y., Yin, F., Liang, Y., Jiang, Y., Wang, D., Hu, K., Qin, X., Wang, Z., Wu, Y., Xu, N., Ye, X., Wang, T., Li, Z.

(2017) J Med Chem 60: 8731-8740

• PubMed: 29045135 
• DOI: 10.1021/acs.jmedchem.7b00732
• Primary Citation of Related Structures:  
  5GS4, 5GTR


• PubMed Abstract: 
  

Direct inhibition of the protein-protein interaction of ERα and its endogenous coactivators with a cell permeable stabilized peptide may offer a novel, promising strategy for combating ERα positive breast cancers. Here, we report the co-crystal structure of a helical peptide stabilized by a N-terminal unnatural cross-linked aspartic acid (TD) in complex with the ERα ligand binding domain (LBD). We designed a series of peptides and peptide 6 that showed direct and high-affinity binding to ERα with selective antiproliferative activity in ERα positive breast cancer cells. The co-crystal structure of the TD-stabilized peptide 6 in complex with ERα LBD further demonstrates that it forms an α helical conformation and directly binds at the coactivator binding site of ERα. Further studies showed that peptide 6 _W could potently inhibit cellular ERα's transcriptional activity. This approach demonstrates the potential of TD stabilized peptides to modulate various intracellular protein-protein interactions involved in a range of disorders.

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Organizational Affiliation: 

School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University , Shenzhen 518055, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Estrogen receptor	A	243	Homo sapiens	Mutation(s): 0  Gene Names: ESR1, ESR, NR3A1
Find proteins for P03372 (Homo sapiens) Explore P03372  Go to UniProtKB:  P03372
NIH Common Fund Data Resources
PHAROS  P03372 GTEx  ENSG00000091831

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
ARG-IAS-ILE-0JY-DPP-ARG-0JY-0JY-GLN-NH2	C	10	unidentified	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EST	A	ESTRADIOL C18 H24 O2 VOXZDWNPVJITMN-ZBRFXRBCSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
DPP	C	L-PEPTIDE LINKING	C3 H8 N2 O2		ALA

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.367 
• R-Value Work: 0.221 
• R-Value Observed: 0.228 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.787	α = 90
b = 60.219	β = 90
c = 66.457	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-3000	data reduction
HKL-3000	data scaling
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2016-08-23 
• Released Date: 2017-08-30 
Deposition Author(s): Xie, M., Wang, T., Li, Z.-G.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China	China	21102007 and 21372023

Revision History 

• Version 1.0: 2017-08-30
  Type: Initial release
  
• Version 1.1: 2017-09-27
  Changes: Data collection
• Version 1.2: 2017-12-20
  Changes: Database references