View source for 7l2k


==Cryo-EM structure of full-length TRPV1 at pH6b state==
<StructureSection load='7l2k' size='340' side='right'caption='[[7l2k]], [[Resolution|resolution]] 3.89&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7l2k]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7L2K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7L2K FirstGlance]. <br>
</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=7l2k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7l2k OCA], [https://pdbe.org/7l2k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7l2k RCSB], [https://www.ebi.ac.uk/pdbsum/7l2k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7l2k ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/TRPV1_RAT TRPV1_RAT]] Receptor-activated non-selective calcium permeant cation channel involved in detection of noxious chemical and thermal stimuli. Seems to mediate proton influx and may be involved in intracellular acidosis in nociceptive neurons. May be involved in mediation of inflammatory pain and hyperalgesia. Sensitized by a phosphatidylinositol second messenger system activated by receptor tyrosine kinases, which involves PKC isozymes and PCL. Activation by vanilloids, like capsaicin, and temperatures higher than 42 degrees Celsius, exhibits a time- and Ca(2+)-dependent outward rectification, followed by a long-lasting refractory state. Mild extracellular acidic pH (6.5) potentiates channel activation by noxious heat and vanilloids, whereas acidic conditions (pH <6) directly activate the channel. Can be activated by endogenous compounds, including 12-hydroperoxytetraenoic acid and bradykinin. Acts as ionotropic endocannabinoid receptor with central neuromodulatory effects. Triggers a form of long-term depression (TRPV1-LTD) mediated by the endocannabinoid anandamine in the hippocampus and nucleus accumbens by affecting AMPA receptors endocytosis.<ref>PMID:9349813</ref> <ref>PMID:10644739</ref> <ref>PMID:11140687</ref> <ref>PMID:11418861</ref> <ref>PMID:12095983</ref> <ref>PMID:12194871</ref> <ref>PMID:12808128</ref> <ref>PMID:14523239</ref> <ref>PMID:12764195</ref> <ref>PMID:14630912</ref> <ref>PMID:15173182</ref> <ref>PMID:21076423</ref>  
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== Publication Abstract from PubMed ==
Many transient receptor potential (TRP) channels respond to diverse stimuli and conditionally conduct small and large cations. Such functional plasticity is presumably enabled by a uniquely dynamic ion selectivity filter that is regulated by physiological agents. What is currently missing is a "photo series" of intermediate structural states that directly address this hypothesis and reveal specific mechanisms behind such dynamic channel regulation. Here, we exploit cryoelectron microscopy (cryo-EM) to visualize conformational transitions of the capsaicin receptor, TRPV1, as a model to understand how dynamic transitions of the selectivity filter in response to algogenic agents, including protons, vanilloid agonists, and peptide toxins, permit permeation by small and large organic cations. These structures also reveal mechanisms governing ligand binding substates, as well as allosteric coupling between key sites that are proximal to the selectivity filter and cytoplasmic gate. These insights suggest a general framework for understanding how TRP channels function as polymodal signal integrators.

Structural snapshots of TRPV1 reveal mechanism of polymodal functionality.,Zhang K, Julius D, Cheng Y Cell. 2021 Aug 31. pii: S0092-8674(21)00982-X. doi: 10.1016/j.cell.2021.08.012. PMID:34496225<ref>PMID:34496225</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Cheng, Y]]
[[Category: Julius, D]]
[[Category: Zhang, K]]
[[Category: Cryo-em]]
[[Category: Full length]]
[[Category: Nanodisc]]
[[Category: Proton]]
[[Category: Transport protein]]
[[Category: Trp channel]]