4mga | pdb_00004mga

Crystal structure of hERa-LBD (Y537S) in complex with 4-tert-octylphenol

spinqualitylabelsall models 4mga, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4mga is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: 27L, CSO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ESR1_HUMAN Nuclear hormone receptor. The steroid hormones and their receptors are involved in the regulation of eukaryotic gene expression and affect cellular proliferation and differentiation in target tissues. Ligand-dependent nuclear transactivation involves either direct homodimer binding to a palindromic estrogen response element (ERE) sequence or association with other DNA-binding transcription factors, such as AP-1/c-Jun, c-Fos, ATF-2, Sp1 and Sp3, to mediate ERE-independent signaling. Ligand binding induces a conformational change allowing subsequent or combinatorial association with multiprotein coactivator complexes through LXXLL motifs of their respective components. Mutual transrepression occurs between the estrogen receptor (ER) and NF-kappa-B in a cell-type specific manner. Decreases NF-kappa-B DNA-binding activity and inhibits NF-kappa-B-mediated transcription from the IL6 promoter and displace RELA/p65 and associated coregulators from the promoter. Recruited to the NF-kappa-B response element of the CCL2 and IL8 promoters and can displace CREBBP. Present with NF-kappa-B components RELA/p65 and NFKB1/p50 on ERE sequences. Can also act synergistically with NF-kappa-B to activate transcription involving respective recruitment adjacent response elements; the function involves CREBBP. Can activate the transcriptional activity of TFF1. Also mediates membrane-initiated estrogen signaling involving various kinase cascades. Isoform 3 is involved in activation of NOS3 and endothelial nitric oxide production. Isoforms lacking one or several functional domains are thought to modulate transcriptional activity by competitive ligand or DNA binding and/or heterodimerization with the full length receptor. Isoform 3 can bind to ERE and inhibit isoform 1. Publication Abstract from PubMed BACKGROUND: Individuals are exposed daily to environmental pollutants which may act as endocrine-disrupting chemicals (EDCs) causing a range of developmental, reproductive, metabolic or neoplastic diseases. With their mostly hydrophobic pocket that serves as a docking site for endogenous and exogenous ligands, nuclear receptors (NRs) can be primary targets of small molecule environmental contaminants. However, most of these compounds are chemically unrelated to natural hormones so their binding modes and associated hormonal activities are hardly predictable. OBJECTIVES: We conducted a correlative analysis of structural and functional data to gain insight into the mechanisms by which twelve members of representative families of pollutants bind to and activate the estrogen receptors ERalpha and ERbeta. METHODS: We have used a battery of biochemical, structural, biophysical and cell-based approaches to characterize the interaction between ERs and their environmental ligands. RESULTS: Our study reveals that the chemically diverse compounds bind to ERs via varied sets of protein ligand interactions reflecting their differential activities, binding affinities and specificities. We show that xenoestrogens bind to both ERs with affinities ranging from sub nanomolar to micromolar values and act in a subtype-dependent fashion as full agonists or partial agonists/antagonists by using different combinations of the activation functions 1 and 2 of ERalpha and ERbeta. CONCLUSIONS: The precise characterization of the interactions between major environmental pollutants and two of their primary biological targets provides rational guidelines for the design of safer chemicals and will increase the accuracy and usefulness of structure-based computational methods, allowing for activity prediction of chemicals in risk assessment. Structural and Functional Profiling of Environmental Ligands for Estrogen Receptors.,Delfosse V, Grimaldi M, Cavailles V, Balaguer P, Bourguet W Environ Health Perspect. 2014 Sep 26. PMID:25260197 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Estrogen receptor 3D structures

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