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==Cryo-EM structure of zebrafish TRPM5 in the presence of 5 mM calcium and 0.5 mM NDNA==
<StructureSection load='7mbv' size='340' side='right'caption='[[7mbv]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7MBV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7MBV 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]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=YUS:N-[(E)-(3,4-dimethoxyphenyl)methylidene]-2-(naphthalen-1-yl)acetohydrazide'>YUS</scene>, <scene name='pdbligand=YUV:(25R)-14beta,17beta-spirost-5-en-3beta-ol'>YUV</scene>, <scene name='pdbligand=YUY:(2R)-2-(hydroxymethyl)-4-{[(25R)-10alpha,14beta,17beta-spirost-5-en-3beta-yl]oxy}butyl+4-O-alpha-D-glucopyranosyl-beta-D-glucopyranoside'>YUY</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=7mbv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7mbv OCA], [https://pdbe.org/7mbv PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7mbv RCSB], [https://www.ebi.ac.uk/pdbsum/7mbv PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7mbv ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The Ca(2+)-activated TRPM5 channel plays essential roles in taste perception and insulin secretion. However, the mechanism by which Ca(2+) regulates TRPM5 activity remains elusive. We report cryo-EM structures of the zebrafish TRPM5 in an apo closed state, a Ca(2+)-bound open state, and an antagonist-bound inhibited state. We define two novel ligand binding sites: a Ca(2+) site (CaICD) in the intracellular domain and an antagonist site in the transmembrane domain (TMD). The CaICD site is unique to TRPM5 and has two roles: modulating the voltage dependence and promoting Ca(2+) binding to the CaTMD site, which is conserved throughout TRPM channels. Conformational changes initialized from both Ca(2+) sites cooperatively open the ion-conducting pore. The antagonist NDNA wedges into the space between the S1-S4 domain and pore domain, stabilizing the transmembrane domain in an apo-like closed state. Our results lay the foundation for understanding the voltage-dependent TRPM channels and developing new therapeutic agents.

Structures of the TRPM5 channel elucidate mechanisms of activation and inhibition.,Ruan Z, Haley E, Orozco IJ, Sabat M, Myers R, Roth R, Du J, Lu W Nat Struct Mol Biol. 2021 Jun 24. pii: 10.1038/s41594-021-00607-4. doi:, 10.1038/s41594-021-00607-4. PMID:34168372<ref>PMID:34168372</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7mbv" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Du J]]
[[Category: Haley E]]
[[Category: Lu W]]
[[Category: Ruan Z]]