6CHZ

Estrogen Receptor Alpha Y537S bound to antagonist H3B-9224.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Discovery of Selective Estrogen Receptor Covalent Antagonists for the Treatment of ER alphaWTand ER alphaMUTBreast Cancer.

Puyang, X.Furman, C.Zheng, G.Z.Wu, Z.J.Banka, D.Aithal, K.Agoulnik, S.Bolduc, D.M.Buonamici, S.Caleb, B.Das, S.Eckley, S.Fekkes, P.Hao, M.H.Hart, A.Houtman, R.Irwin, S.Joshi, J.J.Karr, C.Kim, A.Kumar, N.Kumar, P.Kuznetsov, G.Lai, W.G.Larsen, N.Mackenzie, C.Martin, L.A.Melchers, D.Moriarty, A.Nguyen, T.V.Norris, J.O'Shea, M.Pancholi, S.Prajapati, S.Rajagopalan, S.Reynolds, D.J.Rimkunas, V.Rioux, N.Ribas, R.Siu, A.Sivakumar, S.Subramanian, V.Thomas, M.Vaillancourt, F.H.Wang, J.Wardell, S.Wick, M.J.Yao, S.Yu, L.Warmuth, M.Smith, P.G.Zhu, P.Korpal, M.

(2018) Cancer Discov 8: 1176-1193

  • DOI: 10.1158/2159-8290.CD-17-1229
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mutations in estrogen receptor alpha (ERα) that confer resistance to existing classes of endocrine therapies are detected in up to 30% of patients who have relapsed during endocrine treatments. Because a significant proportion of therapy-resistant br ...

    Mutations in estrogen receptor alpha (ERα) that confer resistance to existing classes of endocrine therapies are detected in up to 30% of patients who have relapsed during endocrine treatments. Because a significant proportion of therapy-resistant breast cancer metastases continue to be dependent on ERα signaling, there remains a critical need to develop the next generation of ERα antagonists that can overcome aberrant ERα activity. Through our drug-discovery efforts, we identified H3B-5942, which covalently inactivates both wild-type and mutant ERα by targeting Cys530 and enforcing a unique antagonist conformation. H3B-5942 belongs to a class of ERα antagonists referred to as selective estrogen receptor covalent antagonists (SERCA). In vitro comparisons of H3B-5942 with standard-of-care (SoC) and experimental agents confirmed increased antagonist activity across a panel of ERα WT and ERα MUT cell lines. In vivo , H3B-5942 demonstrated significant single-agent antitumor activity in xenograft models representing ERα WT and ERα Y537S breast cancer that was superior to fulvestrant. Lastly, H3B-5942 potency can be further improved in combination with CDK4/6 or mTOR inhibitors in both ERα WT and ERα MUT cell lines and/or tumor models. In summary, H3B-5942 belongs to a class of orally available ERα covalent antagonists with an improved profile over SoCs. Significance: Nearly 30% of endocrine therapy-resistant breast cancer metastases harbor constitutively activating mutations in ERα. SERCA H3B-5942 engages C530 of both ERα WT and ERα MUT , promotes a unique antagonist conformation, and demonstrates improved in vitro and in vivo activity over SoC agents. Importantly, single-agent efficacy can be further enhanced by combining with CDK4/6 or mTOR inhibitors. Cancer Discov; 8(9); 1176-93. ©2018 AACR. This article is highlighted in the In This Issue feature, p. 1047 .


    Organizational Affiliation

    H3 Biomedicine, Inc., Cambridge, Massachusetts. Manav_Korpal@h3biomedicine.com Ping_Zhu@h3biomedicine.com.,H3 Biomedicine, Inc., Cambridge, Massachusetts.,Breast Cancer Now, Toby Robins Research Centre, The Institute of Cancer Research, London, UK.,START, Preclinical Research, San Antonio, Texas.,Duke University, Durham, North Carolina.,Eisai Inc., Andover, Massachusetts.,PamGene International, Den Bosch, the Netherlands.,Aurigene Discovery Technologies Ltd., Bangalore, Karnataka, India.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Estrogen receptor
A
263Homo sapiensMutation(s): 3 
Gene Names: ESR1 (ESR, NR3A1)
Find proteins for P03372 (Homo sapiens)
Go to Gene View: ESR1
Go to UniProtKB:  P03372
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
F3D
Query on F3D

Download SDF File 
Download CCD File 
A
4-[(2-{4-[(1E)-1-(1H-indazol-5-yl)-2-phenylbut-1-en-1-yl]phenoxy}ethyl)amino]-N,N-dimethylbutanamide
C31 H36 N4 O2
MWRRXSSGLMVYRJ-CCFHIKDMSA-N
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.212 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 58.608α = 90.00
b = 58.608β = 90.00
c = 276.303γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2018-02-23 
  • Released Date: 2018-03-21 
  • Deposition Author(s): Larsen, N.A.

Revision History 

  • Version 1.0: 2018-03-21
    Type: Initial release
  • Version 1.1: 2018-07-25
    Type: Data collection, Database references
  • Version 1.2: 2018-08-29
    Type: Data collection, Database references
  • Version 1.3: 2018-09-12
    Type: Data collection, Database references