View source for 2kav


==Solution structure of the human Voltage-gated Sodium Channel, brain isoform (Nav1.2)==
<StructureSection load='2kav' size='340' side='right'caption='[[2kav]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2kav]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2KAV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2KAV FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=2kav FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2kav OCA], [https://pdbe.org/2kav PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2kav RCSB], [https://www.ebi.ac.uk/pdbsum/2kav PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2kav ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/SCN2A_HUMAN SCN2A_HUMAN] Defects in SCN2A are the cause of seizures, benign familial infantile type 3 (BFIS3) [MIM:[https://omim.org/entry/607745 607745]. An autosomal dominant disorder in which afebrile seizures occur in clusters during the first year of life, without neurologic sequelae.<ref>PMID:11371648</ref> <ref>PMID:12243921</ref> <ref>PMID:15048894</ref> <ref>PMID:20371507</ref>   Defects in SCN2A are the cause of epileptic encephalopathy early infantile type 11 (EIEE11) [MIM:[https://omim.org/entry/613721 613721]. EIEE11 is an autosomal dominant seizure disorder characterized by infantile onset of refractory seizures with resultant delayed neurologic development and persistent neurologic abnormalities.<ref>PMID:19786696</ref> <ref>PMID:20956790</ref> 
== Function ==
[https://www.uniprot.org/uniprot/SCN2A_HUMAN SCN2A_HUMAN] Mediates the voltage-dependent sodium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a sodium-selective channel through which Na(+) ions may pass in accordance with their electrochemical gradient.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ka/2kav_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2kav ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Voltage-gated sodium channels initiate the rapid upstroke of action potentials in many excitable tissues. Mutations within intracellular C-terminal sequences of specific channels underlie a diverse set of channelopathies, including cardiac arrhythmias and epilepsy syndromes. The three-dimensional structure of the C-terminal residues 1777-1882 of the human NaV1.2 voltage-gated sodium channel has been determined in solution by NMR spectroscopy at pH 7.4 and 290.5 K. The ordered structure extends from residues Leu-1790 to Glu-1868 and is composed of four alpha-helices separated by two short anti-parallel beta-strands; a less well defined helical region extends from residue Ser-1869 to Arg-1882, and a disordered N-terminal region encompasses residues 1777-1789. Although the structure has the overall architecture of a paired EF-hand domain, the NaV1.2 C-terminal domain does not bind Ca2+ through the canonical EF-hand loops, as evidenced by monitoring 1H,15N chemical shifts during aCa2+ titration. Backbone chemical shift resonance assignments and Ca2+ titration also were performed for the NaV1.5 (1773-1878) isoform, demonstrating similar secondary structure architecture and the absence of Ca2+ binding by the EF-hand loops. Clinically significant mutations identified in the C-terminal region of NaV1 sodium channels cluster in the helix I-IV interface and the helix II-III interhelical segment or in helices III and IV of the NaV1.2 (1777-1882) structure.

Solution structure of the NaV1.2 C-terminal EF-hand domain.,Miloushev VZ, Levine JA, Arbing MA, Hunt JF, Pitt GS, Palmer AG 3rd J Biol Chem. 2009 Mar 6;284(10):6446-54. Epub 2009 Jan 7. PMID:19129176<ref>PMID:19129176</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2kav" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ion channels 3D structures|Ion channels 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Arbing MA]]
[[Category: Hunt JF]]
[[Category: Levine JA]]
[[Category: Miloushev VZ]]
[[Category: Palmer AG]]
[[Category: Pitt GS]]