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.
Estrone sulfotransferase | |||||||||
---|---|---|---|---|---|---|---|---|---|
Identifiers | |||||||||
EC no. | 2.8.2.4 | ||||||||
CAS no. | 9026-06-6 | ||||||||
Alt. names | Estrogen sulfotransferase; EST | ||||||||
Databases | |||||||||
IntEnz | IntEnz view | ||||||||
BRENDA | BRENDA entry | ||||||||
ExPASy | NiceZyme view | ||||||||
KEGG | KEGG entry | ||||||||
MetaCyc | metabolic pathway | ||||||||
PRIAM | profile | ||||||||
PDB structures | RCSB PDB PDBe PDBsum | ||||||||
Gene Ontology | AmiGO / QuickGO | ||||||||
|
Steroid sulfatase is an enzyme that catalyzes the reverse reaction, the transfer of a sulfate to an unconjugated estrogen.
In enzymology, an EST is an enzyme that catalyzes the following chemical reaction:
Thus, the two substrates of this enzyme are 3'-phosphoadenylyl sulfate and estrone, whereas its two products are adenosine 3',5'-bisphosphate and estrone 3-sulfate.
The enzyme also catalyzes the same reaction for estradiol, with estradiol sulfate as the product.
Two enzymes have been identified that together are thought to represent estrone sulfotransferase (EST):[1][2]
As of late 2007, 5 structures have been solved for this class of enzymes, with PDB accession codes 1AQU, 1AQY, 1BO6, 1G3M, and 1HY3.
The systematic name of this enzyme class is 3'-phosphoadenylyl-sulfate:estrone 3-sulfotransferase. Other names in common use include 3'-phosphoadenylyl sulfate-estrone 3-sulfotransferase, estrogen sulfotransferase, estrogen sulphotransferase, oestrogen sulphotransferase, and 3'-phosphoadenylylsulfate:oestrone sulfotransferase.
Substrate: 3'-phosphoadenylyl sulfate + estrone
Product: adenosine 3',5'-bisphosphate + estrone 3-sulfate
Organism: Homo sapiens
Commentary (substrate): high activity by SULT1E1, low activity by phenol sulfotransferase SULT1A1, EC 2.8.2.1
{{cite encyclopedia}}
: |website=
ignored (help)