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Estrogen receptor alpha and beta show significant overall sequence homology, and both are composed of five domains designated A/B through F (listed from the N- to C-terminus; amino acid sequence numbers refer to human ER). [citation needed]
Estrogen receptor alpha (ERα), also known as NR3A1 (nuclear receptor subfamily 3, group A, member 1), is one of two main types of estrogen receptor, a nuclear receptor (mainly found as a chromatin-binding protein [5]) that is activated by the sex hormone estrogen. In humans, ERα is encoded by the gene ESR1 (EStrogen Receptor 1). [6] [7] [8]
Estrogen+Receptor+beta at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Overview of all the structural information available in the PDB for UniProt: Q92731 (Estrogen receptor beta) at the PDBe-KB. This article incorporates text from the United States National Library of Medicine, which is in the public domain
The ERRs are orphan nuclear receptors, meaning the identity of their endogenous ligand has yet to be unambiguously determined. They are named because of sequence homology with estrogen receptors, but do not appear to bind estrogens or other tested steroid hormones. There are three human estrogen related receptors: ERRα ; ERRβ ; ERRγ
Estradiol affects target tissues mainly by interacting with two nuclear receptors called estrogen receptor α (ERα) and estrogen receptor β (ERβ). [36] [37] One of the functions of these estrogen receptors is the modulation of gene expression.
There are two main types of estrogen receptor (ER): estrogen receptor alpha (ERα), and estrogen receptor beta (ER-β), also known as NR3A2. Both are nuclear receptors activated by the sex hormone estrogen. Estrogen signaling can be selectively stimulated or inhibited, dependent on the equilibrium of these two receptor types in target organs. [4]
Estradiol is an estrogen, or an agonist of the nuclear estrogen receptors (ERs), the estrogen receptor alpha (ERα) and the estrogen receptor beta (ERβ). [1] [2] [6] In one study, the EC 50 Tooltip half-maximal effective concentration value of estradiol for the human ERα was 50 pM (0.05 nM) and for the human ERβ was 200 pM (0.2 nM).
Estetrol is a major estrogen in the body. [1] [2] In contrast to estrone and estradiol, estetrol is a native estrogen of fetal life. Estetrol is produced exclusively by the fetal liver [1] and is found in detectable levels only during pregnancy, with relatively high levels in the fetus and lower levels in the maternal circulation. [1] [2]
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