View source for 7qeq


==human Connexin 26 dodecamer at 90mmHg PCO2, pH7.4==
<StructureSection load='7qeq' size='340' side='right'caption='[[7qeq]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7QEQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7QEQ 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=PTY:PHOSPHATIDYLETHANOLAMINE'>PTY</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=7qeq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7qeq OCA], [https://pdbe.org/7qeq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7qeq RCSB], [https://www.ebi.ac.uk/pdbsum/7qeq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7qeq ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Connexins form large-pore channels that function either as dodecameric gap junctions or hexameric hemichannels to allow the regulated movement of small molecules and ions across cell membranes. Opening or closing of the channels is controlled by a variety of stimuli, and dysregulation leads to multiple diseases. An increase in the partial pressure of carbon dioxide (PCO2) has been shown to cause connexin26 (Cx26) gap junctions to close. Here, we use cryoelectron microscopy (cryo-EM) to determine the structure of human Cx26 gap junctions under increasing levels of PCO2. We show a correlation between the level of PCO2 and the size of the aperture of the pore, governed by the N-terminal helices that line the pore. This indicates that CO2 alone is sufficient to cause conformational changes in the protein. Analysis of the conformational states shows that movements at the N terminus are linked to both subunit rotation and flexing of the transmembrane helices.

Conformational changes and CO2-induced channel gating in connexin26.,Brotherton DH, Savva CG, Ragan TJ, Dale N, Cameron AD Structure. 2022 Mar 3. pii: S0969-2126(22)00046-6. doi:, 10.1016/j.str.2022.02.010. PMID:35276081<ref>PMID:35276081</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 7qeq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Connexin 3D structure|Connexin 3D structure]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Brotherton DH]]
[[Category: Cameron AD]]
[[Category: Ragan TJ]]
[[Category: Savva CG]]