2ca7: Difference between revisions
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New page: left|200px<br /><applet load="2ca7" size="450" color="white" frame="true" align="right" spinBox="true" caption="2ca7" /> '''CONKUNITZIN-S1 IS THE FIRST MEMBER OF A NEW ... |
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== | ==Conkunitzin-S1 Is The First Member Of A New Kunitz-Type Neurotoxin Family- Structural and Functional Characterization== | ||
Conkunitzin-S1 (Conk-S1) is a 60-residue neurotoxin from the venom of the | <StructureSection load='2ca7' size='340' side='right'caption='[[2ca7]]' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2ca7]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Conus_striatus Conus striatus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1yl2 1yl2]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2CA7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2CA7 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=2ca7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ca7 OCA], [https://pdbe.org/2ca7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ca7 RCSB], [https://www.ebi.ac.uk/pdbsum/2ca7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ca7 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/VKTS1_CONST VKTS1_CONST] Blocks specifically voltage-activated potassium channels (Kv) of the Shaker family (IC(50)=1.33 nM).<ref>PMID:15833744</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/ca/2ca7_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=2ca7 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Conkunitzin-S1 (Conk-S1) is a 60-residue neurotoxin from the venom of the cone snail Conus striatus that interacts with voltage-gated potassium channels. Conk-S1 shares sequence homology with Kunitz-type proteins but contains only two out of the three highly conserved cysteine bridges, which are typically found in these small, basic protein modules. In this study the three-dimensional structure of Conk-S1 has been solved by multidimensional NMR spectroscopy. The solution structure of recombinant Conk-S1 shows that a Kunitz fold is present, even though one of the highly conserved disulfide cross-links is missing. Introduction of a third, homologous disulfide bond into Conk-S1 results in a functional toxin with similar affinity for Shaker potassium channels. The affinity of Conk-S1 can be enhanced by a pore mutation within the Shaker channel pore indicating an interaction of Conk-S1 with the vestibule of potassium channels. | |||
Conkunitzin-S1 is the first member of a new Kunitz-type neurotoxin family. Structural and functional characterization.,Bayrhuber M, Vijayan V, Ferber M, Graf R, Korukottu J, Imperial J, Garrett JE, Olivera BM, Terlau H, Zweckstetter M, Becker S J Biol Chem. 2005 Jun 24;280(25):23766-70. Epub 2005 Apr 15. PMID:15833744<ref>PMID:15833744</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2ca7" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Conus striatus]] | [[Category: Conus striatus]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Bayrhuber | [[Category: Bayrhuber M]] | ||
[[Category: Becker | [[Category: Becker S]] | ||
[[Category: Ferber | [[Category: Ferber M]] | ||
[[Category: Garrett | [[Category: Garrett JE]] | ||
[[Category: Graf | [[Category: Graf R]] | ||
[[Category: Imperial | [[Category: Imperial J]] | ||
[[Category: Korukottu | [[Category: Korukottu J]] | ||
[[Category: Olivera | [[Category: Olivera BM]] | ||
[[Category: Terlau | [[Category: Terlau H]] | ||
[[Category: Vijayan | [[Category: Vijayan V]] | ||
[[Category: Zweckstetter | [[Category: Zweckstetter M]] | ||
Latest revision as of 11:25, 22 May 2024
Conkunitzin-S1 Is The First Member Of A New Kunitz-Type Neurotoxin Family- Structural and Functional Characterization
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