View source for 1vnb


==PROTON NUCLEAR MAGNETIC RESONANCE AND DISTANCE GEOMETRY(SLASH)SIMULATED ANNEALING STUDIES ON THE VARIANT-1 NEUROTOXIN FROM THE NEW WORLD SCORPION CENTRUROIDES SCULPTURATUS EWING==
<StructureSection load='1vnb' size='340' side='right'caption='[[1vnb]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1vnb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Centruroides_sculpturatus Centruroides sculpturatus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VNB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VNB FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 1 model</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=1vnb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vnb OCA], [https://pdbe.org/1vnb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vnb RCSB], [https://www.ebi.ac.uk/pdbsum/1vnb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vnb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SCX1_CENSC SCX1_CENSC] Beta toxins bind voltage-independently at site-4 of sodium channels (Nav) and shift the voltage of activation toward more negative potentials thereby affecting sodium channel activation and promoting spontaneous and repetitive firing (By similarity). Induces immediate paralysis in crickets after injection, with a total paralysis occurring within 15-30 minutes and lasting for 1-2 hours. Is also lethal to vertebrate (chicks) when injected in very high dosages (more than 100 mg/kg).<ref>PMID:4460885</ref> 
== 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/vn/1vnb_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1vnb ConSurf].
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== Publication Abstract from PubMed ==
The sequence-specific proton resonance assignments for the variant-1 (CsE-v1) neurotoxin from the venom of the New World scorpion Centruroides sculpturatus Ewing (range Southwestern United States) have been performed by 2D 1H NMR spectroscopy at 600 MHz. The stereospecific assignments for the beta-methylene protons of 19 non-proline residues have been determined. A number of short-, medium-, and long-range NOESY contacts as well as the backbone and the side-chain vicinal coupling constants for several residues have been determined. Slowly exchanging amide hydrogens from a number of residues have been identified. On the basis of the NMR data, the solution structure of this protein has been determined by a hybrid procedure consisting of distance geometry and dynamical simulated annealing refinement calculations. Distance constraints from the NOESY data and torsion angle constraints from proton vicinal coupling constant data were used in the simulated annealing calculations. The three-dimensional structure of CsE-v1 is characterized by a three-stranded antiparallel beta-sheet, a short alpha-helix, a cis-proline, and intervening loops. A comparison with the solution NMR data of a homologous protein (CsE-v3) from the Centruroides venom, shows that the structures are essentially similar, except for some minor differences. Some of the NMR spectral perturbations are felt in regions far removed from sites of amino acid substitutions. The hydrophobic surface in CsE-v1 is slightly more extended than in CsE-v3.

Proton nuclear magnetic resonance and distance geometry/simulated annealing studies on the variant-1 neurotoxin from the New World scorpion Centruroides sculpturatus Ewing.,Lee W, Jablonsky MJ, Watt DD, Krishna NR Biochemistry. 1994 Mar 8;33(9):2468-75. PMID:8117707<ref>PMID:8117707</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Centruroides sculpturatus]]
[[Category: Large Structures]]
[[Category: Krishna NR]]
[[Category: Lee W]]