View source for 7rtj


==SthK Y26F Activated State==
<StructureSection load='7rtj' size='340' side='right'caption='[[7rtj]], [[Resolution|resolution]] 3.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7rtj]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Spirochaeta_thermophila Spirochaeta thermophila]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7RTJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7RTJ 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]] 3.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CMP:ADENOSINE-3,5-CYCLIC-MONOPHOSPHATE'>CMP</scene>, <scene name='pdbligand=PGW:(1R)-2-{[(S)-{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(HEXADECANOYLOXY)METHYL]ETHYL+(9Z)-OCTADEC-9-ENOATE'>PGW</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=7rtj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7rtj OCA], [https://pdbe.org/7rtj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7rtj RCSB], [https://www.ebi.ac.uk/pdbsum/7rtj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7rtj ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/G0GA88_SPITZ G0GA88_SPITZ] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Understanding how ion channels gate is important for elucidating their physiological roles and targeting them in pathophysiological states. Here, we used SthK, a cyclic nucleotide-modulated channel from Spirochaeta thermophila, to define a ligand-gating trajectory that includes multiple on-pathway intermediates. cAMP is a poor partial agonist for SthK and depolarization increases SthK activity. Tuning the energy landscape by gain-of-function mutations in the voltage sensor domain (VSD) allowed us to capture multiple intermediates along the ligand-activation pathway, highlighting the allosteric linkage between VSD, cyclic nucleotide-binding (CNBD) and pore domains. Small, lateral displacements of the VSD S4 segment were necessary to open the intracellular gate, pointing to an inhibitory VSD at rest. We propose that in wild-type SthK, depolarization leads to such VSD displacements resulting in release of inhibition. In summary, we report conformational transitions along the activation pathway that reveal allosteric couplings between key sites integrating to open the intracellular gate.

Gating intermediates reveal inhibitory role of the voltage sensor in a cyclic nucleotide-modulated ion channel.,Gao X, Schmidpeter PAM, Berka V, Durham RJ, Fan C, Jayaraman V, Nimigean CM Nat Commun. 2022 Nov 14;13(1):6919. doi: 10.1038/s41467-022-34673-z. PMID:36376326<ref>PMID:36376326</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7rtj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Spirochaeta thermophila]]
[[Category: Gao X]]
[[Category: Nimigean C]]