View source for 6mvx


==NavAb Voltage-gated Sodium Channel, I217C, in Complex with Class 1C Anti-arrhythmic Flecainide==
<StructureSection load='6mvx' size='340' side='right'caption='[[6mvx]], [[Resolution|resolution]] 3.46&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6mvx]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Aliarcobacter_butzleri_RM4018 Aliarcobacter butzleri RM4018]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MVX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6MVX 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]] 3.455&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=K4D:~{N}-[[(2~{R})-piperidin-2-yl]methyl]-2,5-bis[2,2,2-tris(fluoranyl)ethoxy]benzamide'>K4D</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=6mvx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6mvx OCA], [https://pdbe.org/6mvx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6mvx RCSB], [https://www.ebi.ac.uk/pdbsum/6mvx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6mvx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A8EVM5_ALIB4 A8EVM5_ALIB4] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Potency of drug action is usually determined by binding to a specific receptor site on target proteins. In contrast to this conventional paradigm, we show here that potency of local anesthetics (LAs) and antiarrhythmic drugs (AADs) that block sodium channels is controlled by fenestrations that allow drug access to the receptor site directly from the membrane phase. Voltage-gated sodium channels initiate action potentials in nerve and cardiac muscle, where their hyperactivity causes pain and cardiac arrhythmia, respectively. LAs and AADs selectively block sodium channels in rapidly firing nerve and muscle cells to relieve these conditions. The structure of the ancestral bacterial sodium channel NaVAb, which is also blocked by LAs and AADs, revealed fenestrations connecting the lipid phase of the membrane to the central cavity of the pore. We cocrystallized lidocaine and flecainide with NavAb, which revealed strong drug-dependent electron density in the central cavity of the pore. Mutation of the contact residue T206 greatly reduced drug potency, confirming this site as the receptor for LAs and AADs. Strikingly, mutations of the fenestration cap residue F203 changed fenestration size and had graded effects on resting-state block by flecainide, lidocaine, and benzocaine, the potencies of which were altered from 51- to 2.6-fold in order of their molecular size. These results show that conserved fenestrations in the pores of sodium channels are crucial pharmacologically and determine the level of resting-state block by widely used drugs. Fine-tuning drug access through fenestrations provides an unexpected avenue for structure-based design of ion-channel-blocking drugs.

Fenestrations control resting-state block of a voltage-gated sodium channel.,Gamal El-Din TM, Lenaeus MJ, Zheng N, Catterall WA Proc Natl Acad Sci U S A. 2018 Dec 5. pii: 1814928115. doi:, 10.1073/pnas.1814928115. PMID:30518562<ref>PMID:30518562</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6mvx" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Aliarcobacter butzleri RM4018]]
[[Category: Large Structures]]
[[Category: Catterall WA]]
[[Category: Lenaeus MJ]]