5DXP

Crystal Structure of the ER-alpha Ligand-binding Domain in Complex with the Cyclofenil Derivative 4-[(E)-(1s,5s)-bicyclo[3.3.1]non-9-ylidene(phenyl)methyl]phenol

Summary for 5DXP

• Entry DOI: 10.2210/pdb5dxp/pdb
• Related: 5DXK
• Descriptor: Estrogen receptor, Nuclear receptor coactivator 2, 4-[(E)-(1s,5s)-bicyclo[3.3.1]non-9-ylidene(phenyl)methyl]phenol, ... (4 entities in total)
• Functional Keywords: nuclear receptor, transcription factor, ligand binding, protein-ligand complex, transcription
• Biological source: Homo sapiens (Human); More
• Cellular location: Isoform 1: Nucleus . Isoform 3: Nucleus. Nucleus: P03372; Nucleus: Q15596
• Total number of polymer chains: 4
• Total formula weight: 62541.81

Authors

Nwachukwu, J.C.,Srinivasan, S.,Zheng, Y.,Wang, S.,Min, J.,Dong, C.,Liao, Z.,Cavett, V.,Nowak, J.,Houtman, R.,Carlson, K.E.,Josan, J.S.,Elemento, O.,Katzenellenbogen, J.A.,Zhou, H.B.,Nettles, K.W. (deposition date: 2015-09-23, release date: 2016-05-04, Last modification date: 2023-09-27)

Primary citation

Nwachukwu, J.C.,Srinivasan, S.,Zheng, Y.,Wang, S.,Min, J.,Dong, C.,Liao, Z.,Nowak, J.,Wright, N.J.,Houtman, R.,Carlson, K.E.,Josan, J.S.,Elemento, O.,Katzenellenbogen, J.A.,Zhou, H.B.,Nettles, K.W.
Predictive features of ligand-specific signaling through the estrogen receptor.
Mol.Syst.Biol., 12:864-864, 2016

PubMed Abstract: Some estrogen receptor-α (ERα)-targeted breast cancer therapies such as tamoxifen have tissue-selective or cell-specific activities, while others have similar activities in different cell types. To identify biophysical determinants of cell-specific signaling and breast cancer cell proliferation, we synthesized 241 ERα ligands based on 19 chemical scaffolds, and compared ligand response using quantitative bioassays for canonical ERα activities and X-ray crystallography. Ligands that regulate the dynamics and stability of the coactivator-binding site in the C-terminal ligand-binding domain, called activation function-2 (AF-2), showed similar activity profiles in different cell types. Such ligands induced breast cancer cell proliferation in a manner that was predicted by the canonical recruitment of the coactivators NCOA1/2/3 and induction of the GREB1 proliferative gene. For some ligand series, a single inter-atomic distance in the ligand-binding domain predicted their proliferative effects. In contrast, the N-terminal coactivator-binding site, activation function-1 (AF-1), determined cell-specific signaling induced by ligands that used alternate mechanisms to control cell proliferation. Thus, incorporating systems structural analyses with quantitative chemical biology reveals how ligands can achieve distinct allosteric signaling outcomes through ERα.

PubMed: 27107013
DOI: 10.15252/msb.20156701

Experimental method

X-RAY DIFFRACTION (2.201 Å)