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New page: left|200px<br /><applet load="1qdp" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qdp" /> '''SOLUTION STRUCTURE OF ROBUSTOXIN, THE LETHAL... |
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== | ==SOLUTION STRUCTURE OF ROBUSTOXIN, THE LETHAL NEUROTOXIN FROM THE FUNNEL WEB SPIDER ATRAX ROBUSTUS, NMR, 20 STRUCTURES== | ||
The solution structure of robustoxin, the lethal neurotoxin from the | <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]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== 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®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1qdp" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Atrax robustus]] | [[Category: Atrax robustus]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Alewood | [[Category: Alewood D]] | ||
[[Category: Alewood | [[Category: Alewood PF]] | ||
[[Category: Norton | [[Category: Norton RS]] | ||
[[Category: Pallaghy | [[Category: Pallaghy PK]] | ||
Latest revision as of 03:24, 21 November 2024
SOLUTION STRUCTURE OF ROBUSTOXIN, THE LETHAL NEUROTOXIN FROM THE FUNNEL WEB SPIDER ATRAX ROBUSTUS, NMR, 20 STRUCTURESSOLUTION STRUCTURE OF ROBUSTOXIN, THE LETHAL NEUROTOXIN FROM THE FUNNEL WEB SPIDER ATRAX ROBUSTUS, NMR, 20 STRUCTURES
Structural highlights
FunctionTXDT1_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.[1] [2] [3] [4] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe 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[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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