View source for 3rw0

==Crystal structure of the NavAb voltage-gated sodium channel (Met221Cys, 2.95 A)==
<StructureSection load='3rw0' size='340' side='right' caption='[[3rw0]], [[Resolution|resolution]] 2.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3rw0]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Arcobacter_butzleri Arcobacter butzleri]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3RW0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3RW0 FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PX4:1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>PX4</scene><br>
<tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3rvy|3rvy]], [[3rvz|3rvz]]</td></tr>
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Abu_1752 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=28197 Arcobacter butzleri])</td></tr>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3rw0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3rw0 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3rw0 RCSB], [http://www.ebi.ac.uk/pdbsum/3rw0 PDBsum]</span></td></tr>
<table>
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== Publication Abstract from PubMed ==
Voltage-gated sodium (Na(V)) channels initiate electrical signalling in excitable cells and are the molecular targets for drugs and disease mutations, but the structural basis for their voltage-dependent activation, ion selectivity and drug block is unknown. Here we report the crystal structure of a voltage-gated Na(+) channel from Arcobacter butzleri (NavAb) captured in a closed-pore conformation with four activated voltage sensors at 2.7 A resolution. The arginine gating charges make multiple hydrophilic interactions within the voltage sensor, including unanticipated hydrogen bonds to the protein backbone. Comparisons to previous open-pore potassium channel structures indicate that the voltage-sensor domains and the S4-S5 linkers dilate the central pore by pivoting together around a hinge at the base of the pore module. The NavAb selectivity filter is short, approximately 4.6 A wide, and water filled, with four acidic side chains surrounding the narrowest part of the ion conduction pathway. This unique structure presents a high-field-strength anionic coordination site, which confers Na(+) selectivity through partial dehydration via direct interaction with glutamate side chains. Fenestrations in the sides of the pore module are unexpectedly penetrated by fatty acyl chains that extend into the central cavity, and these portals are large enough for the entry of small, hydrophobic pore-blocking drugs. This structure provides the template for understanding electrical signalling in excitable cells and the actions of drugs used for pain, epilepsy and cardiac arrhythmia at the atomic level.

The crystal structure of a voltage-gated sodium channel.,Payandeh J, Scheuer T, Zheng N, Catterall WA Nature. 2011 Jul 10;475(7356):353-8. doi: 10.1038/nature10238. PMID:21743477<ref>PMID:21743477</ref>

From MEDLINEÂ®/PubMedÂ®, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Arcobacter butzleri]]
[[Category: Catterall, W A.]]
[[Category: Payandeh, J.]]
[[Category: Scheuer, T.]]
[[Category: Zheng, N.]]
[[Category: Membrane]]
[[Category: Metal transport]]
[[Category: Tetrameric ion channel]]
[[Category: Voltage-gated sodium-selective ion channel]]