View source for 1qdp


==SOLUTION STRUCTURE OF ROBUSTOXIN, THE LETHAL NEUROTOXIN FROM THE FUNNEL WEB SPIDER ATRAX ROBUSTUS, NMR, 20 STRUCTURES==
<StructureSection load='1qdp' size='340' side='right'caption='[[1qdp]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qdp]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Atrax_robustus Atrax robustus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QDP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QDP FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=1qdp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qdp OCA], [https://pdbe.org/1qdp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qdp RCSB], [https://www.ebi.ac.uk/pdbsum/1qdp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qdp ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TXDT1_ATRRO TXDT1_ATRRO] Inhibits tetrodotoxin-sensitive voltage-gated sodium channels (Nav) by binding to site 3. It slows the inactivation, causes a prolongation of action potential duration resulting in repetitive firing in autonomic and motor nerve fibers. Does not depolarize the resting potential. Does not affect tetrodotoxin-resistant sodium channels. This lethal neurotoxin is active on both insect and mammalian voltage-gated sodium channels.<ref>PMID:2728033</ref> <ref>PMID:14596608</ref> <ref>PMID:9845331</ref> <ref>PMID:9560455</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/qd/1qdp_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=1qdp ConSurf].
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== Publication Abstract from PubMed ==
The solution structure of robustoxin, the lethal neurotoxin from the Sydney funnel-web spider Atrax robustus, has been determined from 2D 1H NMR data. Robustoxin is a polypeptide of 42 residues cross-linked by four disulphide bonds, the connectivities of which were determined from NMR data and trial structure calculations to be 1-15, 8-20, 14-31 and 16-42 (a 1-4/2-6/3-7/5-8 pattern). The structure consists of a small three-stranded, anti-parallel beta-sheet and a series of interlocking gamma-turns at the C-terminus. It also contains a cystine knot, thus placing it in the inhibitor cystine knot motif family of structures, which includes the omega-conotoxins and a number of plant and animal toxins and protease inhibitors. Robustoxin contains three distinct charged patches on its surface, and an extended loop that includes several aromatic and non-polar residues. Both of these structural features may play a role in its binding to the voltage-gated sodium channel.

Solution structure of robustoxin, the lethal neurotoxin from the funnel-web spider Atrax robustus.,Pallaghy PK, Alewood D, Alewood PF, Norton RS FEBS Lett. 1997 Dec 15;419(2-3):191-6. PMID:9428632<ref>PMID:9428632</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: Atrax robustus]]
[[Category: Large Structures]]
[[Category: Alewood D]]
[[Category: Alewood PF]]
[[Category: Norton RS]]
[[Category: Pallaghy PK]]