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==Solution Structure of the STIM1 CC1-CC2 homodimer.==
==Solution Structure of the STIM1 CC1-CC2 homodimer.==
<StructureSection load='2maj' size='340' side='right' caption='[[2maj]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
<StructureSection load='2maj' size='340' side='right'caption='[[2maj]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2maj]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MAJ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2MAJ FirstGlance]. <br>
<table><tr><td colspan='2'>[[2maj]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2MAJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2MAJ FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2mak|2mak]]</td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">STIM1, GOK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=2maj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2maj OCA], [https://pdbe.org/2maj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2maj RCSB], [https://www.ebi.ac.uk/pdbsum/2maj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2maj ProSAT]</span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2maj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2maj OCA], [http://pdbe.org/2maj PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2maj RCSB], [http://www.ebi.ac.uk/pdbsum/2maj PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2maj ProSAT]</span></td></tr>
</table>
</table>
== Disease ==
== Disease ==
[[http://www.uniprot.org/uniprot/STIM1_HUMAN STIM1_HUMAN]] Defects in STIM1 are the cause of immune dysfunction with T-cell inactivation due to calcium entry defect type 2 (IDTICED2) [MIM:[http://omim.org/entry/612783 612783]]. IDTICED2 is an immune disorder characterized by recurrent infections, impaired T-cell activation and proliferative response, decreased T-cell production of cytokines, lymphadenopathy, and normal lymphocytes counts and serum immunoglobulin levels. Additional features include thrombocytopenia, autoimmune hemolytic anemia, non-progressive myopathy, partial iris hypoplasia, hepatosplenomegaly and defective enamel dentition.<ref>PMID:19420366</ref>
[https://www.uniprot.org/uniprot/STIM1_HUMAN STIM1_HUMAN] Defects in STIM1 are the cause of immune dysfunction with T-cell inactivation due to calcium entry defect type 2 (IDTICED2) [MIM:[https://omim.org/entry/612783 612783]. IDTICED2 is an immune disorder characterized by recurrent infections, impaired T-cell activation and proliferative response, decreased T-cell production of cytokines, lymphadenopathy, and normal lymphocytes counts and serum immunoglobulin levels. Additional features include thrombocytopenia, autoimmune hemolytic anemia, non-progressive myopathy, partial iris hypoplasia, hepatosplenomegaly and defective enamel dentition.<ref>PMID:19420366</ref>  
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/STIM1_HUMAN STIM1_HUMAN]] Plays a role in mediating store-operated Ca(2+) entry (SOCE), a Ca(2+) influx following depletion of intracellular Ca(2+) stores. Acts as Ca(2+) sensor in the endoplasmic reticulum via its EF-hand domain. Upon Ca(2+) depletion, translocates from the endoplasmic reticulum to the plasma membrane where it activates the Ca(2+) release-activated Ca(2+) (CRAC) channel subunit, TMEM142A/ORAI1.<ref>PMID:9377559</ref> <ref>PMID:16005298</ref> <ref>PMID:15866891</ref> <ref>PMID:16208375</ref> <ref>PMID:16807233</ref> <ref>PMID:16766533</ref> <ref>PMID:16733527</ref> <ref>PMID:16537481</ref> <ref>PMID:22464749</ref> 
[https://www.uniprot.org/uniprot/STIM1_HUMAN STIM1_HUMAN] Plays a role in mediating store-operated Ca(2+) entry (SOCE), a Ca(2+) influx following depletion of intracellular Ca(2+) stores. Acts as Ca(2+) sensor in the endoplasmic reticulum via its EF-hand domain. Upon Ca(2+) depletion, translocates from the endoplasmic reticulum to the plasma membrane where it activates the Ca(2+) release-activated Ca(2+) (CRAC) channel subunit, TMEM142A/ORAI1.<ref>PMID:9377559</ref> <ref>PMID:16005298</ref> <ref>PMID:15866891</ref> <ref>PMID:16208375</ref> <ref>PMID:16807233</ref> <ref>PMID:16766533</ref> <ref>PMID:16733527</ref> <ref>PMID:16537481</ref> <ref>PMID:22464749</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Orai1 calcium channels in the plasma membrane are activated by stromal interaction molecule-1 (STIM1), an endoplasmic reticulum calcium sensor, to mediate store-operated calcium entry (SOCE). The cytosolic region of STIM1 contains a long putative coiled-coil (CC)1 segment and shorter CC2 and CC3 domains. Here we present solution nuclear magnetic resonance structures of a trypsin-resistant CC1-CC2 fragment in the apo and Orai1-bound states. Each CC1-CC2 subunit forms a U-shaped structure that homodimerizes through antiparallel interactions between equivalent alpha-helices. The CC2:CC2' helix pair clamps two identical acidic Orai1 C-terminal helices at opposite ends of a hydrophobic/basic STIM-Orai association pocket. STIM1 mutants disrupting CC1:CC1' interactions attenuate, while variants promoting CC1 stability spontaneously activate Orai1 currents. CC2 mutations cause remarkable variability in Orai1 activation because of a dual function in binding Orai1 and autoinhibiting STIM1 oligomerization via interactions with CC3. We conclude that SOCE is activated through dynamic interplay between STIM1 and Orai1 helices.
 
STIM1/Orai1 coiled-coil interplay in the regulation of store-operated calcium entry.,Stathopulos PB, Schindl R, Fahrner M, Zheng L, Gasmi-Seabrook GM, Muik M, Romanin C, Ikura M Nat Commun. 2013 Dec 19;4:2963. doi: 10.1038/ncomms3963. PMID:24351972<ref>PMID:24351972</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2maj" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Human]]
[[Category: Homo sapiens]]
[[Category: Ikura, M]]
[[Category: Large Structures]]
[[Category: Stathopulos, P B]]
[[Category: Ikura M]]
[[Category: Coiled-coil]]
[[Category: Stathopulos PB]]
[[Category: Signaling protein]]
[[Category: Stim1]]
[[Category: Transport protein]]
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