孕酮受体(英語:progesterone receptor,缩写PR,也被称为NR3C3 ,nuclear receptor subfamily 3, group C, member 3,即核受体第三亚族C组成员3)是一种细胞内蛋白质,由甾体激素孕酮激活。
In humans, PR is encoded by a single PGRgene residing on chromosome 11q22,[1][2][3] it has two main forms, A and B, that differ in their molecular weight.[4][5][6]
功能
Progesterone is necessary to induce the progesterone receptors. When no binding hormone is present the carboxyl terminal inhibits transcription. Binding to a hormone induces a structural change that removes the inhibitory action. Progesterone antagonists prevent the structural reconfiguration.
After progesterone binds to the receptor, restructuring with dimerization follows and the complex enters the nucleus and binds to DNA. There transcription takes place, resulting in formation of messenger RNA that is translated by ribosomes to produce specific proteins.
In common with other steroid receptors, the progesterone receptor has a N-terminal regulatory domain, a DNA binding domain, a hinge section, and a C-terminal ligand binding domain. A special transcription activation function (TAF), called TAF-3, is present in the progesterone receptor-B, in a B-upstream segment (BUS) at the amino acid terminal. This segment is not present in the receptor-A.
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