View source for 5mzq


==X-ray structure of the M205W mutant of GLIC in complex with bromoform==
<StructureSection load='5mzq' size='340' side='right'caption='[[5mzq]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5mzq]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Gloeobacter_violaceus_PCC_7421 Gloeobacter violaceus PCC 7421]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5MZQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5MZQ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=2IL:(3R)-3-(dodecanoyloxy)tetradecanoic+acid'>2IL</scene>, <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=D12:DODECANE'>D12</scene>, <scene name='pdbligand=MBR:TRIBROMOMETHANE'>MBR</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PC8:1,2-DIOCTANOYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>PC8</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=5mzq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mzq OCA], [https://pdbe.org/5mzq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5mzq RCSB], [https://www.ebi.ac.uk/pdbsum/5mzq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5mzq 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 ==
Ion channel modulation by general anesthetics is a vital pharmacological process with implications for receptor biophysics and drug development. Functional studies have implicated conserved sites of both potentiation and inhibition in pentameric ligand-gated ion channels, but a detailed structural mechanism for these bimodal effects is lacking. The prokaryotic model protein GLIC recapitulates anesthetic modulation of human ion channels, and it is accessible to structure determination in both apparent open and closed states. Here, we report ten X-ray structures and electrophysiological characterization of GLIC variants in the presence and absence of general anesthetics, including the surgical agent propofol. We show that general anesthetics can allosterically favor closed channels by binding in the pore or favor open channels via various subsites in the transmembrane domain. Our results support an integrated, multi-site mechanism for allosteric modulation, and they provide atomic details of both potentiation and inhibition by one of the most common general anesthetics.

Structural Basis for a Bimodal Allosteric Mechanism of General Anesthetic Modulation in Pentameric Ligand-Gated Ion Channels.,Fourati Z, Howard RJ, Heusser SA, Hu H, Ruza RR, Sauguet L, Lindahl E, Delarue M Cell Rep. 2018 Apr 24;23(4):993-1004. doi: 10.1016/j.celrep.2018.03.108. PMID:29694907<ref>PMID:29694907</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5mzq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ion channels 3D structures|Ion channels 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Gloeobacter violaceus PCC 7421]]
[[Category: Large Structures]]
[[Category: Delarue M]]
[[Category: Fourati Z]]