ChEMBL ligand: CHEMBL1230314 (15.alpha.-hydroxyestriol, E-4, E4, Estetrol, Estetrol (anhydrous), Estetrol anhydrous, Estetrol (e4), Estetrol hydrate, Estetrol (hydrous), Estetrol monohydrate)
Estrogen receptor-α/Estrogen receptor alpha in Human [ChEMBL: CHEMBL206] [GtoPdb: 620] [UniProtKB: P03372] There should be some charts here, you may need to enable JavaScript!
Estrogen receptor-β/Estrogen receptor beta in Human [ChEMBL: CHEMBL242] [GtoPdb: 621] [UniProtKB: Q92731] There should be some charts here, you may need to enable JavaScript!

DB	Assay description	Assay Type	Standard value	Standard parameter	Original value	Original units	Original parameter	Reference
Estrogen receptor-α/Estrogen receptor alpha in Human (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL206] [GtoPdb: 620] [UniProtKB: P03372]
ChEMBL	Inhibition Assay: The method employed was adapted from the scientific literature and described in detail by Osboum et al. (1993, Biochemistry, 32, 6229-6236). Recombinant human ERalpha and ERbeta proteins were purified from transfected Sf9-cells. The in vitro assays involved the use of either ERalpha or ERbeta proteins and [3H]E2, at a fixed concentration of 0.5 nM, as the labeled ligand. Recombinant human ERalpha or ERbeta proteins were dissolved in binding buffer (10 mM Tris-HCL, pH 7.5, 10% glycerol, 1 mM DTT, 1 mg/ml BSA) and duplicate aliquots were then incubated with [3H]E2 at a final concentration of 0.5 nM, together with a vehicle control (0.4% DMSO), or the same amount of vehicle containing increasing concentrations of unlabeled steroid ligands as competitors. After incubation for 2 h at 25 C., the unbound ligands were removed and the amounts of [3H]E2 bound to either ERalpha or ERbeta proteins were measured.	B	8.31	pKi	4.9	nM	Ki	US-9040509-B2. Method of treating human skin and a skin care composition for use in such a method (2015)
ChEMBL	Binding Assay: The method employed was adapted from the scientific literature and described in detail by Osbourn et al. (1993, Biochemistry, 32, 6229-6236). Recombinant human ERalpha and ERR proteins were purified from transfected Sf9-cells. The in vitro assays involved the use of either ERalpha or ERbeta proteins and [3H]E2, at a fixed concentration of 0.5 nM, as the labeled ligand. Recombinant human ERalpha or ERbeta proteins were dissolved in binding buffer (10 mM Tris-HCL, pH 7.5, 10% glycerol, 1 mM DTT, 1 mg/ml BSA) and duplicate aliquots were then incubated with [3H]E2 at a final concentration of 0.5 nM, together with a vehicle control (0.4% DMSO), or the same amount of vehicle containing increasing concentrations of unlabeled steroid ligands as competitors. After incubation for 2 h at 25 C., the unbound ligands were removed and the amounts of [3H]E2 bound to either ERalpha or ERbeta proteins were measured.	B	8.31	pKi	4.9	nM	Ki	US-9034854-B2. Pharmaceutical composition comprising estetrol derivatives for use in cancer therapy (2015)
Estrogen receptor-β/Estrogen receptor beta in Human (target type: SINGLE PROTEIN) [ChEMBL: CHEMBL242] [GtoPdb: 621] [UniProtKB: Q92731]
ChEMBL	Binding Assay: The method employed was adapted from the scientific literature and described in detail by Osbourn et al. (1993, Biochemistry, 32, 6229-6236). Recombinant human ERalpha and ERR proteins were purified from transfected Sf9-cells. The in vitro assays involved the use of either ERalpha or ERbeta proteins and [3H]E2, at a fixed concentration of 0.5 nM, as the labeled ligand. Recombinant human ERalpha or ERbeta proteins were dissolved in binding buffer (10 mM Tris-HCL, pH 7.5, 10% glycerol, 1 mM DTT, 1 mg/ml BSA) and duplicate aliquots were then incubated with [3H]E2 at a final concentration of 0.5 nM, together with a vehicle control (0.4% DMSO), or the same amount of vehicle containing increasing concentrations of unlabeled steroid ligands as competitors. After incubation for 2 h at 25 C., the unbound ligands were removed and the amounts of [3H]E2 bound to either ERalpha or ERbeta proteins were measured.	B	7.72	pKi	19	nM	Ki	US-9034854-B2. Pharmaceutical composition comprising estetrol derivatives for use in cancer therapy (2015)
ChEMBL	Inhibition Assay: The method employed was adapted from the scientific literature and described in detail by Osboum et al. (1993, Biochemistry, 32, 6229-6236). Recombinant human ERalpha and ERbeta proteins were purified from transfected Sf9-cells. The in vitro assays involved the use of either ERalpha or ERbeta proteins and [3H]E2, at a fixed concentration of 0.5 nM, as the labeled ligand. Recombinant human ERalpha or ERbeta proteins were dissolved in binding buffer (10 mM Tris-HCL, pH 7.5, 10% glycerol, 1 mM DTT, 1 mg/ml BSA) and duplicate aliquots were then incubated with [3H]E2 at a final concentration of 0.5 nM, together with a vehicle control (0.4% DMSO), or the same amount of vehicle containing increasing concentrations of unlabeled steroid ligands as competitors. After incubation for 2 h at 25 C., the unbound ligands were removed and the amounts of [3H]E2 bound to either ERalpha or ERbeta proteins were measured.	B	7.72	pKi	19	nM	Ki	US-9040509-B2. Method of treating human skin and a skin care composition for use in such a method (2015)

ChEMBL data shown on this page come from version 34:

Zdrazil B, Felix E, Hunter F, Manners EJ, Blackshaw J, Corbett S, de Veij M, Ioannidis H, Lopez DM, Mosquera JF, Magarinos MP, Bosc N, Arcila R, Kizilören T, Gaulton A, Bento AP, Adasme MF, Monecke P, Landrum GA, Leach AR. (2024). The ChEMBL Database in 2023: a drug discovery platform spanning multiple bioactivity data types and time periods. Nucleic Acids Res., 52(D1). DOI: 10.1093/nar/gkad1004. [EPMCID:10767899] [PMID:37933841]
Davies M, Nowotka M, Papadatos G, Dedman N, Gaulton A, Atkinson F, Bellis L, Overington JP. (2015) 'ChEMBL web services: streamlining access to drug discovery data and utilities.' Nucleic Acids Res., 43(W1). DOI: 10.1093/nar/gkv352. [EPMCID:25883136]