View source for 4zzb


==The GLIC pentameric Ligand-Gated Ion Channel Locally-closed form complexed to xenon==
<StructureSection load='4zzb' size='340' side='right'caption='[[4zzb]], [[Resolution|resolution]] 3.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4zzb]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Gloeobacter_violaceus_PCC_8105 Gloeobacter violaceus PCC 8105]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZZB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ZZB FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=XE:XENON'>XE</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=4zzb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zzb OCA], [https://pdbe.org/4zzb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4zzb RCSB], [https://www.ebi.ac.uk/pdbsum/4zzb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4zzb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GLIC_GLOVI GLIC_GLOVI] Cationic channel with similar permeabilities for Na(+) and K(+), that is activated by an increase of the proton concentration on the extracellular side. Displays no permeability for chloride ions. Shows slow kinetics of activation, no desensitization and a single channel conductance of 8 pS. Might contribute to adaptation to external pH change.<ref>PMID:17167423</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
GLIC receptor is a bacterial pentameric ligand-gated ion channel whose action is inhibited by xenon. Xenon has been used in clinical practice as a potent gaseous anaesthetic for decades, but the molecular mechanism of interactions with its integral membrane receptor targets remains poorly understood. Here we characterize by X-ray crystallography the xenon-binding sites within both the open and "locally-closed" (inactive) conformations of GLIC. Major binding sites of xenon, which differ between the two conformations, were identified in three distinct regions that all belong to the trans-membrane domain of GLIC: 1) in an intra-subunit cavity, 2) at the interface between adjacent subunits, and 3) in the pore. The pore site is unique to the locally-closed form where the binding of xenon effectively seals the channel. A putative mechanism of the inhibition of GLIC by xenon is proposed, which might be extended to other pentameric cationic ligand-gated ion channels.

Structural Basis for Xenon Inhibition in a Cationic Pentameric Ligand-Gated Ion Channel.,Sauguet L, Fourati Z, Prange T, Delarue M, Colloc'h N PLoS One. 2016 Feb 24;11(2):e0149795. doi: 10.1371/journal.pone.0149795., eCollection 2016. PMID:26910105<ref>PMID:26910105</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4zzb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ion channels 3D structures|Ion channels 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Gloeobacter violaceus PCC 8105]]
[[Category: Large Structures]]
[[Category: Colloc'h N]]
[[Category: Delarue M]]
[[Category: Fourati Z]]
[[Category: Prange T]]
[[Category: Sauguet L]]