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1f5f

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[[Image:1f5f.gif|left|200px]]<br /><applet load="1f5f" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1f5f, resolution 1.7&Aring;" />
 
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'''CRYSTAL STRUCTURE OF THE N-TERMINAL G-DOMAIN OF SHBG IN COMPLEX WITH ZINC'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF THE N-TERMINAL G-DOMAIN OF SHBG IN COMPLEX WITH ZINC==
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One calcium-binding site (site I) and a second poorly defined metal-binding site (site II) have been observed previously within the amino-terminal laminin G-like domain (G domain) of human sex hormone-binding globulin (SHBG). By soaking crystals of this structure in 2.5 mm ZnCl(2), site II and a new metal-binding site (site III) were found to bind Zn(2+). Site II is located close to the steroid-binding site, and Zn(2+) is coordinated by the side chains of His(83) and His(136) and the carboxylate group of Asp(65). In this site, Zn(2+) prevents Asp(65) from interacting with the steroid 17beta-hydroxy group and alters the conformations of His(83) and His(136), as well as a disordered region over the steroid-binding site. Site III is formed by the side chains of His(101) and the carboxylate group of Asp(117), and the distance between them (2.7 A) is increased to 3.7 A in the presence of Zn(2+). The affinity of SHBG for estradiol is reduced in the presence of 0. 1-1 mm Zn(2+), whereas its affinity for androgens is unchanged, and chemically-related metal ions (Cd(2+) and Hg(2+)) have similar but less pronounced effects. This is not observed when Zn(2+) coordination at site II is modified by substituting Gln for His(136). An alteration in the steroid-binding specificity of human SHBG by Zn(2+) occupancy of site II may be relevant in male reproductive tissues where zinc concentrations are very high.
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<StructureSection load='1f5f' size='340' side='right'caption='[[1f5f]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1f5f]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F5F OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1F5F FirstGlance]. <br>
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1F5F is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=CA:'>CA</scene>, <scene name='pdbligand=ZN:'>ZN</scene>, <scene name='pdbligand=DHT:'>DHT</scene> and <scene name='pdbligand=IPA:'>IPA</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F5F OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=DHT:5-ALPHA-DIHYDROTESTOSTERONE'>DHT</scene>, <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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==Reference==
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1f5f FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f5f OCA], [https://pdbe.org/1f5f PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1f5f RCSB], [https://www.ebi.ac.uk/pdbsum/1f5f PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1f5f ProSAT]</span></td></tr>
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Steroid-binding specificity of human sex hormone-binding globulin is influenced by occupancy of a zinc-binding site., Avvakumov GV, Muller YA, Hammond GL, J Biol Chem. 2000 Aug 25;275(34):25920-5. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10859323 10859323]
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/SHBG_HUMAN SHBG_HUMAN] Functions as an androgen transport protein, but may also be involved in receptor mediated processes. Each dimer binds one molecule of steroid. Specific for 5-alpha-dihydrotestosterone, testosterone, and 17-beta-estradiol. Regulates the plasma metabolic clearance rate of steroid hormones by controlling their plasma concentration.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/f5/1f5f_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1f5f ConSurf].
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<div style="clear:both"></div>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Avvakumov, V A.]]
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[[Category: Avvakumov VA]]
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[[Category: Hammond, G L.]]
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[[Category: Hammond GL]]
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[[Category: Muller, Y A.]]
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[[Category: Muller YA]]
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[[Category: CA]]
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[[Category: DHT]]
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[[Category: IPA]]
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[[Category: ZN]]
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[[Category: jellyroll]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:35:06 2008''
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Current revision

CRYSTAL STRUCTURE OF THE N-TERMINAL G-DOMAIN OF SHBG IN COMPLEX WITH ZINC

PDB ID 1f5f

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