|Detection of Human Progesterone R/NR3C3 by Western Blot. Western blot shows lysates of T47D human breast cancer cell line. PVDF membrane was probed with 1 µg/mL of Human Progesterone R/NR3C3 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF5415) followed by HRP‑conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). Specific bands were detected for PR-A and PR-B at approximately 90 and 118 kDa, respectively (as indicated). This experiment was conducted using Immunoblot Buffer Group 1.|
Progesterone Receptor B (PR-B) is a 118 kDa member of the NR3 subfamily within the nuclear hormone receptor family of proteins. It is expressed in female reproductive tissues as well as neurons throughout the CNS. PR-B is particularly important in the mammary gland where it mediates proliferative responses to progesterone. Human PR-B is 933 amino acids (aa) in length. It contains an N-terminal regulatory region (aa 1‑566), a DNA binding domain (aa 567‑639), and a steroid‑binding region (aa 681‑933). Ligand binding induces a key phosphorylation event at Ser294 by ERK1/2. An alternate start site at Met165 generates 90 kDa PR‑A, an isoform particularly important in the ovary and uterus that insures fertility. Other isoforms show a deletion of either aa 637‑738 or 598‑636, or a 17 aa substitution for aa 787‑933.
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