1d2s
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| , resolution 1.55Å | |||||||
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| Ligands: | and | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF THE N-TERMINAL LAMININ G-LIKE DOMAIN OF SHBG IN COMPLEX WITH DIHYDROTESTOSTERONE
OverviewOverview
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.
About this StructureAbout this Structure
1D2S is a Single protein structure of sequence from Homo sapiens. The following page contains interesting information on the relation of 1D2S with [Anabolic Steroids]. Full crystallographic information is available from OCA.
ReferenceReference
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
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