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Steroid receptors are ligand-dependent intracellular proteins that stimulate transcription of specific genes by binding to specific DNA sequences following activation by the appropriate hormone. Prior to activation, steroid receptors associate with a number of different proteins in both a stable and transient fashion. Steroid receptor complex proteins include heat shock proteins (HSP70 and HSP90), immunosuppressant binding proteins called immunophilins (the FK506 binding proteins, FKBP52 & FKBP54 and the cyclosporin binding protein, CyP-40) and at least three other proteins termed p23, p60 and p48. p23 along with HSP70, HSP90 and p60, combine with progesterone receptor (PR) as members of a transient intermediate complex. Cloned human p23 encodes a protein of 160 amino acids that is highly conserved between species and shows no homology to previously identified proteins. p23 is a highly acidic phosphoprotein with an aspartic acid-rich C-terminal domain and multiple potential phosphorylation sites. In vitro studies have suggested that p23 binds to HSP90 and is necessary for the binding of HSP90 and CyP-40 to PR. While neither its exact function nor mechanism of action have been identified, p23 appears to be an important factor in PR function.
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Protein Aliases: Co chaperone p23; cPGES; cytosolic prostaglandin E synthase; Cytosolic prostaglandin E2 synthase; Hsp90 co chaperone; Hsp90 co-chaperone; p23 cochaperone; Progesterone receptor complex p23; Prostaglandin E synthase 3; prostaglandin E synthase 3 (cytosolic); prostaglandin-E synthase 3; ptges3 {ECO:0000250|UniProtKB:Q15185}; Sid 3177; telomerase binding protein, p23; Telomerase-binding protein p23; unactive progesterone receptor, 23 kD
Gene Aliases: 5730442A20Rik; cPGES; P23; Ptges; PTGES3; RGD1561913; Sid3177; TEBP
UniProt ID: (Human) Q15185, (Rat) P83868, (Mouse) Q9R0Q7
Entrez Gene ID: (Pig) 100155956, (Human) 10728, (Rat) 362809, (Mouse) 56351
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