View source for 4hkr


==Calcium release-activated calcium (CRAC) channel ORAI==
<StructureSection load='4hkr' size='340' side='right'caption='[[4hkr]], [[Resolution|resolution]] 3.35&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4hkr]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4HKR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4HKR FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.3511&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BA:BARIUM+ION'>BA</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4hkr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4hkr OCA], [https://pdbe.org/4hkr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4hkr RCSB], [https://www.ebi.ac.uk/pdbsum/4hkr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4hkr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CRCM1_DROME CRCM1_DROME] Ca(2+) release-activated Ca(2+) (CRAC) channel subunit which mediates Ca(2+) influx following depletion of intracellular Ca(2+) stores. Regulates transcription factor NFAT nuclear import.<ref>PMID:16582901</ref> <ref>PMID:16645049</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The plasma membrane protein Orai forms the pore of the calcium release-activated calcium (CRAC) channel and generates sustained cytosolic calcium signals when triggered by depletion of calcium from the endoplasmic reticulum. The crystal structure of Orai from Drosophila melanogaster, determined at 3.35 angstrom resolution, reveals that the calcium channel is composed of a hexameric assembly of Orai subunits arranged around a central ion pore. The pore traverses the membrane and extends into the cytosol. A ring of glutamate residues on its extracellular side forms the selectivity filter. A basic region near the intracellular side can bind anions that may stabilize the closed state. The architecture of the channel differs markedly from other ion channels and gives insight into the principles of selective calcium permeation and gating.

Crystal structure of the calcium release-activated calcium channel Orai.,Hou X, Pedi L, Diver MM, Long SB Science. 2012 Dec 7;338(6112):1308-13. doi: 10.1126/science.1228757. Epub 2012, Nov 22. PMID:23180775<ref>PMID:23180775</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4hkr" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Drosophila melanogaster]]
[[Category: Large Structures]]
[[Category: Hou X]]
[[Category: Long SB]]