View source for 7xqf


==Structure of C-terminal truncated connexin43/Cx43/GJA1 gap junction intercellular channel in POPE/CHS nanodiscs==
<StructureSection load='7xqf' size='340' side='right'caption='[[7xqf]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7xqf]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7XQF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7XQF 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=C14:TETRADECANE'>C14</scene>, <scene name='pdbligand=PTY:PHOSPHATIDYLETHANOLAMINE'>PTY</scene>, <scene name='pdbligand=Y01:CHOLESTEROL+HEMISUCCINATE'>Y01</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=7xqf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7xqf OCA], [https://pdbe.org/7xqf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7xqf RCSB], [https://www.ebi.ac.uk/pdbsum/7xqf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7xqf ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Connexin family proteins assemble into hexameric hemichannels in the cell membrane. The hemichannels dock together between two adjacent membranes to form gap junction intercellular channels (GJIChs). We report the cryo-electron microscopy structures of Cx43 GJICh, revealing the dynamic equilibrium state of various channel conformations in detergents and lipid nanodiscs. We identify three different N-terminal helix conformations of Cx43-gate-covering (GCN), pore-lining (PLN), and flexible intermediate (FIN)-that are randomly distributed in purified GJICh particles. The conformational equilibrium shifts to GCN by cholesteryl hemisuccinates and to PLN by C-terminal truncations and at varying pH. While GJIChs that mainly comprise GCN protomers are occluded by lipids, those containing conformationally heterogeneous protomers show markedly different pore sizes. We observe an alpha-to-pi-helix transition in the first transmembrane helix, which creates a side opening to the membrane in the FIN and PLN conformations. This study provides basic structural information to understand the mechanisms of action and regulation of Cx43 GJICh.

Conformational changes in the human Cx43/GJA1 gap junction channel visualized using cryo-EM.,Lee HJ, Cha HJ, Jeong H, Lee SN, Lee CW, Kim M, Yoo J, Woo JS Nat Commun. 2023 Feb 18;14(1):931. doi: 10.1038/s41467-023-36593-y. PMID:36805660<ref>PMID:36805660</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7xqf" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Cha HJ]]
[[Category: Jeong H]]
[[Category: Lee CW]]
[[Category: Lee HJ]]
[[Category: Lee SN]]
[[Category: Woo JS]]