Tricyclic indazoles a novel class of selective estrogen receptor degrader antagonists

Experimental Data Snapshot

  • Resolution: 1.84 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Tricyclic Indazoles-A Novel Class of Selective Estrogen Receptor Degrader Antagonists.

Scott, J.S.Bailey, A.Buttar, D.Carbajo, R.J.Curwen, J.Davey, P.R.J.Davies, R.D.M.Degorce, S.L.Donald, C.Gangl, E.Greenwood, R.Groombridge, S.D.Johnson, T.Lamont, S.Lawson, M.Lister, A.Morrow, C.J.Moss, T.A.Pink, J.H.Polanski, R.

(2019) J Med Chem 62: 1593-1608

  • DOI: https://doi.org/10.1021/acs.jmedchem.8b01837
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Herein, we report the identification and synthesis of a series of tricyclic indazoles as a novel class of selective estrogen receptor degrader antagonists. Replacement of a phenol, present in our previously reported tetrahydroisoquinoline scaffold, with an indazole group led to the removal of a reactive metabolite signal in an in vitro glutathione trapping assay. Further optimization, guided by X-ray crystal structures and NMR conformational work, varied the alkyl side chain and pendant aryl group and resulted in compounds with low turnover in human hepatocytes and enhanced chemical stability. Compound 9 was profiled as a representative of the series in terms of pharmacology and demonstrated the desired estrogen receptor α degrader-antagonist profile and demonstrated activity in a xenograft model of breast cancer.

  • Organizational Affiliation

    Oncology IMED Biotech Unit , AstraZeneca, R&D Boston , 35 Gatehouse Drive , Waltham , Massachusetts 02451 , United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Estrogen receptor237Homo sapiensMutation(s): 0 
Gene Names: ESR1ESRNR3A1
UniProt & NIH Common Fund Data Resources
Find proteins for P03372 (Homo sapiens)
Explore P03372 
Go to UniProtKB:  P03372
GTEx:  ENSG00000091831 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03372
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on H8W

Download Ideal Coordinates CCD File 
B [auth A]3-[4-[(6~{R})-7-(2-methylpropyl)-3,6,8,9-tetrahydropyrazolo[4,3-f]isoquinolin-6-yl]phenyl]propanoic acid
C23 H27 N3 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.84 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.353α = 90
b = 58.353β = 90
c = 275.443γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-23
    Type: Initial release
  • Version 1.1: 2019-02-06
    Changes: Data collection, Database references
  • Version 1.2: 2019-04-24
    Changes: Data collection, Database references