View source for 8trk


==Cryo-EM structure of the rat P2X7 receptor in complex with the allosteric antagonist methyl blue==
<StructureSection load='8trk' size='340' side='right'caption='[[8trk]], [[Resolution|resolution]] 2.69&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8trk]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus Rattus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8TRK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8TRK 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]] 2.69&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=KFM:4-[[4-[bis[4-[(4-sulfophenyl)amino]phenyl]methyl]phenyl]amino]benzenesulfonic+acid'>KFM</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PLM:PALMITIC+ACID'>PLM</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=8trk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8trk OCA], [https://pdbe.org/8trk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8trk RCSB], [https://www.ebi.ac.uk/pdbsum/8trk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8trk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/P2RX7_RAT P2RX7_RAT] Receptor for ATP that acts as a ligand-gated ion channel. Responsible for ATP-dependent lysis of macrophages through the formation of membrane pores permeable to large molecules. Could function in both fast synaptic transmission and the ATP-mediated lysis of antigen-presenting cells.
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== Publication Abstract from PubMed ==
P2X receptors are trimeric ion channels activated by adenosine triphosphate (ATP) that contribute to pathophysiological processes ranging from asthma to neuropathic pain and neurodegeneration. A number of small-molecule antagonists have been identified for these important pharmaceutical targets. However, the molecular pharmacology of P2X receptors is poorly understood because of the chemically disparate nature of antagonists and their differential actions on the seven constituent subtypes. Here, we report high-resolution cryo-electron microscopy structures of the homomeric rat P2X(7) receptor bound to five previously known small-molecule allosteric antagonists and a sixth antagonist that we identify. Our structural, biophysical, and electrophysiological data define the molecular determinants of allosteric antagonism in this pharmacologically relevant receptor, revealing three distinct classes of antagonists that we call shallow, deep, and starfish. Starfish binders, exemplified by the previously unidentified antagonist methyl blue, represent a unique class of inhibitors with distinct functional properties that could be exploited to develop potent P2X(7) ligands with substantial clinical impact.

P2X(7) receptors exhibit at least three modes of allosteric antagonism.,Oken AC, Ditter IA, Lisi NE, Krishnamurthy I, Godsey MH, Mansoor SE Sci Adv. 2024 Oct 4;10(40):eado5084. doi: 10.1126/sciadv.ado5084. Epub 2024 Oct , 4. PMID:39365862<ref>PMID:39365862</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Rattus]]
[[Category: Ditter IA]]
[[Category: Godsey MH]]
[[Category: Krishnamurthy I]]
[[Category: Lisi NE]]
[[Category: Mansoor SE]]
[[Category: McCarthy AE]]
[[Category: Oken AC]]