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==Crystal structure of SOAR domain with Inhibition helix from C. elegans==
==Crystal structure of SOAR domain with Inhibition helix from C. elegans==
<StructureSection load='3ter' size='340' side='right' caption='[[3ter]], [[Resolution|resolution]] 2.55&Aring;' scene=''>
<StructureSection load='3ter' size='340' side='right'caption='[[3ter]], [[Resolution|resolution]] 2.55&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[3ter]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Caeel Caeel]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TER OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3TER FirstGlance]. <br>
<table><tr><td colspan='2'>[[3ter]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Caenorhabditis_elegans Caenorhabditis elegans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3TER OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3TER FirstGlance]. <br>
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">stim-1, Y55B1BM.1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=6239 CAEEL])</td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.551&#8491;</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=3ter FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ter OCA], [http://pdbe.org/3ter PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3ter RCSB], [http://www.ebi.ac.uk/pdbsum/3ter PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3ter ProSAT]</span></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=3ter FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ter OCA], [https://pdbe.org/3ter PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3ter RCSB], [https://www.ebi.ac.uk/pdbsum/3ter PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3ter ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Function ==
== Publication Abstract from PubMed ==
[https://www.uniprot.org/uniprot/STIM1_CAEEL STIM1_CAEEL] 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 which upon Ca(2+) depletion, activates the Ca(2+) release-activated Ca(2+) (CRAC) channel subunit, orai-1. Essential for Ca (2+) and IP3-dependent contractile activity of gonad sheath cells and spermatheca. Essential for fertility. Does not play a role in posterior body wall muscle contraction (pBoc) rhythmicity, intestinal cell oscillatory Ca(2+) signaling or intestinal ER Ca(2+) hemeostasis.<ref>PMID:16966474</ref> <ref>PMID:17218360</ref>  
Calcium influx through the Ca(2+) release-activated Ca(2+) (CRAC) channel is an essential process in many types of cells. Upon store depletion, the calcium sensor in the endoplasmic reticulum, STIM1, activates Orai1, a CRAC channel in the plasma membrane. We have determined the structures of SOAR from Homo sapiens (hSOAR), which is part of STIM1 and is capable of constitutively activating Orai1, and the entire coiled coil region of STIM1 from Caenorhabditis elegans (ceSTIM1-CCR) in an inactive state. Our studies reveal that the formation of a SOAR dimer is necessary to activate the Orai1 channel. Mutations that disrupt SOAR dimerization or remove the cluster of positive residues abolish STIM1 activation of Orai1. We identified a possible inhibitory helix within the structure of ceSTIM1-CCR that tightly interacts with SOAR. Functional studies suggest that the inhibitory helix may keep the C-terminus of STIM1 in an inactive state. Our data allowed us to propose a model for STIM1 activation.
 
Structural and mechanistic insights into the activation of Stromal interaction molecule 1 (STIM1).,Yang X, Jin H, Cai X, Li S, Shen Y Proc Natl Acad Sci U S A. 2012 Mar 26. PMID:22451904<ref>PMID:22451904</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3ter" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Caeel]]
[[Category: Caenorhabditis elegans]]
[[Category: Cai, X]]
[[Category: Large Structures]]
[[Category: Jin, H]]
[[Category: Cai X]]
[[Category: Shen, Y]]
[[Category: Jin H]]
[[Category: Yang, X]]
[[Category: Shen Y]]
[[Category: Dimer]]
[[Category: Yang X]]
[[Category: Metal binding protein]]

Latest revision as of 11:37, 20 March 2024

Crystal structure of SOAR domain with Inhibition helix from C. elegansCrystal structure of SOAR domain with Inhibition helix from C. elegans

Structural highlights

3ter is a 2 chain structure with sequence from Caenorhabditis elegans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.551Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

STIM1_CAEEL 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 which upon Ca(2+) depletion, activates the Ca(2+) release-activated Ca(2+) (CRAC) channel subunit, orai-1. Essential for Ca (2+) and IP3-dependent contractile activity of gonad sheath cells and spermatheca. Essential for fertility. Does not play a role in posterior body wall muscle contraction (pBoc) rhythmicity, intestinal cell oscillatory Ca(2+) signaling or intestinal ER Ca(2+) hemeostasis.[1] [2]

References

  1. ↑ Yan X, Xing J, Lorin-Nebel C, Estevez AY, Nehrke K, Lamitina T, Strange K. Function of a STIM1 homologue in C. elegans: evidence that store-operated Ca2+ entry is not essential for oscillatory Ca2+ signaling and ER Ca2+ homeostasis. J Gen Physiol. 2006 Oct;128(4):443-59. doi: 10.1085/jgp.200609611. Epub 2006 Sep , 11. PMID:16966474 doi:http://dx.doi.org/10.1085/jgp.200609611
  2. ↑ Lorin-Nebel C, Xing J, Yan X, Strange K. CRAC channel activity in C. elegans is mediated by Orai1 and STIM1 homologues and is essential for ovulation and fertility. J Physiol. 2007 Apr 1;580(Pt 1):67-85. Epub 2007 Jan 11. PMID:17218360 doi:http://dx.doi.org/jphysiol.2006.124883

3ter, resolution 2.55Å

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