First time at Proteopedia? Click on the green links, they change the 3D image. Click and drag the molecules. Proteopedia is a 3D, interactive encyclopedia of proteins, RNA, DNA and other molecules. With a free user account, you can edit pages in Proteopedia. Visit the Main Page to learn more.
1p49
From Proteopedia
| 1p49, resolution 2.60Å () | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ligands: | , , , | ||||||||
| Non-Standard Residues: | |||||||||
| Activity: | Steryl-sulfatase, with EC number 3.1.6.2 | ||||||||
| Domains: | Sulfatase | ||||||||
| |||||||||
| |||||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||
Structure of Human Placental Estrone/DHEA Sulfatase
Estrone sulfatase (ES; 562 amino acids), one of the key enzymes responsible for maintaining high levels of estrogens in breast tumor cells, is associated with the membrane of the endoplasmic reticulum (ER). The structure of ES, purified from the microsomal fraction of human placentas, has been determined at 2.60-A resolution by x-ray crystallography. This structure shows a domain consisting of two antiparallel alpha-helices that protrude from the roughly spherical molecule, thereby giving the molecule a "mushroom-like" shape. These highly hydrophobic helices, each about 40 A long, are capable of traversing the membrane, thus presumably anchoring the functional domain on the membrane surface facing the ER lumen. The location of the transmembrane domain is such that the opening to the active site, buried deep in a cavity of the "gill" of the "mushroom," rests near the membrane surface, thereby suggesting a role of the lipid bilayer in catalysis. This simple architecture could be a prototype utilized by the ER membrane in dictating the form and the function of ER-resident enzymes.
Structure of human estrone sulfatase suggests functional roles of membrane association., Hernandez-Guzman FG, Higashiyama T, Pangborn W, Osawa Y, Ghosh D, J Biol Chem. 2003 Jun 20;278(25):22989-97. Epub 2003 Mar 25. PMID:12657638
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1P49 is a 1 chain structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
- Hernandez-Guzman FG, Higashiyama T, Pangborn W, Osawa Y, Ghosh D. Structure of human estrone sulfatase suggests functional roles of membrane association. J Biol Chem. 2003 Jun 20;278(25):22989-97. Epub 2003 Mar 25. PMID:12657638 doi:10.1074/jbc.M211497200
Page seeded by OCA on Tue Feb 17 14:01:40 2009
