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1d2s
From Proteopedia
| 1d2s, resolution 1.55Å () | |||||||||
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| Sites: | , and | ||||||||
| Ligands: | , | ||||||||
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||
CRYSTAL STRUCTURE OF THE N-TERMINAL LAMININ G-LIKE DOMAIN OF SHBG IN COMPLEX WITH DIHYDROTESTOSTERONE
Human sex hormone-binding globulin (SHBG) transports sex steroids in blood and regulates their access to target tissues. In biological fluids, SHBG exists as a homodimer and each monomer comprises two laminin G-like domains (G domains). The crystal structure of the N-terminal G domain of SHBG in complex with 5alpha-dihydrotestosterone at 1.55 A resolution reveals both the architecture of the steroid-binding site and the quaternary structure of the dimer. We also show that G domains have jellyroll topology and are structurally related to pentraxin. In each SHBG monomer, the steroid intercalates into a hydrophobic pocket within the beta-sheet sandwich. The steroid and a 20 A distant calcium ion are not located at the dimer interface. Instead, two separate steroid-binding pockets and calcium-binding sites exist per dimer. The structure displays intriguing disorder for loop segment Pro130-Arg135. In all other jellyroll proteins, this loop is well ordered. If modelled accordingly, it covers the steroid-binding site and could thereby regulate access of ligands to the binding pocket.
Crystal structure of human sex hormone-binding globulin: steroid transport by a laminin G-like domain., Grishkovskaya I, Avvakumov GV, Sklenar G, Dales D, Hammond GL, Muller YA, EMBO J. 2000 Feb 15;19(4):504-12. PMID:10675319
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1D2S is a 1 chain structure with sequence from Homo sapiens. The August 2007 RCSB PDB Molecule of the Month feature on Anabolic Steroids by David S. Goodsell is 10.2210/rcsb_pdb/mom_2007_8. Full crystallographic information is available from OCA.
Reference
- Grishkovskaya I, Avvakumov GV, Sklenar G, Dales D, Hammond GL, Muller YA. Crystal structure of human sex hormone-binding globulin: steroid transport by a laminin G-like domain. EMBO J. 2000 Feb 15;19(4):504-12. PMID:10675319
Page seeded by OCA on Thu Jan 21 08:55:30 2010
