View source for 8ymq


==OSCA1.1-F516A nanodisc==
<StructureSection load='8ymq' size='340' side='right'caption='[[8ymq]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8ymq]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8YMQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8YMQ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PEE:1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOETHANOLAMINE'>PEE</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=8ymq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8ymq OCA], [https://pdbe.org/8ymq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8ymq RCSB], [https://www.ebi.ac.uk/pdbsum/8ymq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8ymq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CSCL5_ARATH CSCL5_ARATH] Acts as a hyperosmolarity-gated non-selective cation channel that permeates Ca(2+) ions. Shows the following permeability sequence: K(+) > Ba(2+) = Ca(2+) > Na(+) = Mg(2+) = Cs(+).<ref>PMID:25162526</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
OSCA/TMEM63 channels, which have transporter-like architectures, are bona fide mechanosensitive (MS) ion channels that sense high-threshold mechanical forces in eukaryotic cells. The activation mechanism of these transporter-like channels is not fully understood. Here we report cryo-EM structures of a dimeric OSCA/TMEM63 pore mutant OSCA1.1-F516A with a sequentially extracellular dilated pore in a detergent environment. These structures suggest that the extracellular pore sequential dilation resembles a flower blooming and couples to a sequential contraction of each monomer subunit towards the dimer interface and subsequent extrusion of the dimer interface lipids. Interestingly, while OSCA1.1-F516A remains non-conducting in the native lipid environment, it can be directly activated by lyso-phosphatidylcholine (Lyso-PC) with reduced single-channel conductance. Structural analysis of OSCA1.1-F516A in lyso-PC-free and lyso-PC-containing lipid nanodiscs indicates that lyso-PC induces intracellular pore dilation by attracting the M6b to upward movement away from the intracellular side thus extending the intracellular pore. Further functional studies indicate that full activation of MS OSCA/TMEM63 dimeric channels by high-threshold mechanical force also involves the opening of both intercellular and extracellular pores. Our results provide the fundamental activation paradigm of the unique transporter-like MS OSCA/TMEM63 channels, which is likely applicable to functional branches of the TMEM63/TMEM16/TMC superfamilies.

Activation mechanisms of dimeric mechanosensitive OSCA/TMEM63 channels.,Shan Y, Zhang M, Chen M, Guo X, Li Y, Zhang M, Pei D Nat Commun. 2024 Aug 29;15(1):7504. doi: 10.1038/s41467-024-51800-0. PMID:39209849<ref>PMID:39209849</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8ymq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Arabidopsis thaliana]]
[[Category: Large Structures]]
[[Category: Zhang MF]]