Estrone sulfotransferase (EST) (EC 2.8.2.4), also known as estrogen sulfotransferase, is an enzyme that catalyzes the transformation of an unconjugated estrogen like estrone into a sulfated estrogen like estrone sulfate. It is a steroid sulfotransferase and belongs to the family of transferases, to be specific, the sulfotransferases, which transfer sulfur-containing groups. This enzyme participates in androgen and estrogen metabolism and sulfur metabolism. Steroid sulfatase is an enzyme that catalyzes the reverse reaction, the transfer of a sulfate to an unconjugated estrogen. Sulfotransferase that utilizes 3'-phospho-5'-adenylyl sulfate (PAPS) as sulfonate donor to catalyze the sulfate conjugation of estradiol and estrone . Is a key enzyme in estrogen homeostasis, the sulfation of estrogens leads to their inactivation. Also sulfates dehydroepiandrosterone (DHEA), pregnenolone, (24S)-hydroxycholesterol and xenobiotic compounds like ethinylestradiol, equalenin, diethyl stilbesterol and 1-naphthol at significantly lower efficiency . Does not sulfonate cortisol, testosterone and dopamine .
Background References
1. Falany C.N. et. al. Bacterial expression and characterization of a cDNA for human liver estrogen sulfotransferase. J. Steroid Biochem. Mol. Biol. 52:529-539(1995).
Western blot analysis of Estrogen Sulfotransferase on Mouse kidney tissue lysates with Rabbit anti-Estrogen Sulfotransferase antibody (HA500065) at 1/2,000 dilution.
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: HA500065, 1/2,000 in primary antibody dilution buffer (K1803), overnight at 4 ℃ Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 35.1 kDa Observed band size: 35.1 kDa
Immunohistochemical analysis of paraffin-embedded human small intestine tissue using anti-Estrogen Sulfotransferase antibody. The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 8.0-8.4) for 20 minutes.The tissues were blocked in 5% BSA for 30 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (HA500065, 1/200) for 30 minutes at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
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