Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 29.40 kDa 
• Atom Count: 1963 
• Modelled Residue Count: 232 
• Deposited Residue Count: 254 
• Unique protein chains: 1

1UOM

The Structure of Estrogen Receptor in Complex with a Selective and Potent Tetrahydroisochiolin Ligand.

• DOI: 10.2210/pdb1UOM/pdb

• Classification: NUCLEAR PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2003-04-11 Released: 2003-07-03 
• Deposition Author(s): Stark, W., Bischoff, S.F., Buhl, T., Fournier, B., Halleux, C., Kallen, J., Keller, H., Renaud, J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.28 Å
• R-Value Free: 0.287 
• R-Value Work: 0.235 

Literature

Estrogen Receptor Modulators: Identification and Structure-Activity Relationships of Potent Eralpha-Selective Tetrahydroisoquinoline Ligands

Renaud, J., Bischoff, S.F., Buhl, T., Floersheim, P., Fournier, B., Halleux, C., Kallen, J., Keller, H., Schlaeppi, J.-M., Stark, W.

(2003) J Med Chem 46: 2945

• PubMed: 12825935 
• DOI: 10.1021/jm030086h
• Primary Citation of Related Structures:  
  1UOM


• PubMed Abstract: 
  

As part of a program aimed at the development of selective estrogen receptor modulators (SERMs), tetrahydroisoquinoline derivative 27 was discovered by high throughput screening. Successive replacements of the p-F substituent of 27 by an aminoethoxy side chain and of the 1-H of the tetrahydroisoquinoline core by a 1-Me group provided analogues 19 and 20. These compounds showed potencies in a cell-based reporter gene assay (ERE assay) varying between 0.6 and 20 nM and displayed antagonist behaviors in the MCF-7 human breast adenocarcinoma cell line with IC(50)s in the range of 2-36 nM. The effect of N-phenyl substituents on the activity and pharmacokinetic properties of tetrahydroisoquinoline analogues was explored. As a result of this investigation, two potent derivatives bearing a p-F N-aryl group, 19c and 20c, were discovered as candidates suitable for further profiling. To gain insight into the ligand-receptor interaction, the X-ray crystallographic structure of the 1-H tetrahydroisoquinoline derivative (R)-18a in complex with ERalpha-ligand binding domain (LBD)(301)(-)(553)/C-->S triple mutant was solved to 2.28 A. An overlay of this X-ray crystal structure with that reported for the complex of ERalpha-LBD(301)(-)(553)/carboxymethylated C and raloxifene (5) shows that both compounds bind to the same cleft of the receptor and display comparable binding modes, with differences being observed in the conformation of their "D-ring" phenyl groups.

---

Organizational Affiliation: 

Novartis Pharma Research, WKL-136.3.25, CH-4002 Basel, Switzerland. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ESTROGEN RECEPTOR	A	254	Homo sapiens	Mutation(s): 3  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

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PTI	A	2-PHENYL-1-[4-(2-PIPERIDIN-1-YL-ETHOXY)-PHENYL]-1,2,3,4-TETRAHYDRO-ISOQUINOLIN-6-OL C28 H32 N2 O2 FMWVCTJKLAVRPB-MUUNZHRXSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
PTI	IC50:  16.479999542236328   nM  BindingDB
PTI	EC50:  16.5   nM  BindingDB
PTI	IC50:  19   nM  Binding MOAD
PTI	IC50 :  19   nM  PDBBind
PTI	IC50:  19   nM  BindingDB
PTI	IC50:  19.010000228881836   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.28 Å
• R-Value Free: 0.287 
• R-Value Work: 0.235 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.2	α = 90
b = 58.2	β = 90
c = 274.6	γ = 120

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-04-11 
• Released Date: 2003-07-03 
Deposition Author(s): Stark, W., Bischoff, S.F., Buhl, T., Fournier, B., Halleux, C., Kallen, J., Keller, H., Renaud, J.

Revision History  

• Version 1.0: 2003-07-03
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance