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{{Seed}}
[[Image:1ne5.png|left|200px]]


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==Solution Structure of HERG Specific Scorpion Toxin CnErg1==
The line below this paragraph, containing "STRUCTURE_1ne5", creates the "Structure Box" on the page.
<StructureSection load='1ne5' size='340' side='right'caption='[[1ne5]]' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)  
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1ne5]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Centruroides_noxius Centruroides noxius]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NE5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NE5 FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</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>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ne5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ne5 OCA], [https://pdbe.org/1ne5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ne5 RCSB], [https://www.ebi.ac.uk/pdbsum/1ne5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ne5 ProSAT]</span></td></tr>
{{STRUCTURE_1ne5|  PDB=1ne5  |  SCENE= }}
</table>
== Function ==
[https://www.uniprot.org/uniprot/KGX11_CENNO KGX11_CENNO] Blocks human and rat Kv11.1/KCNH2/ERG1 and Kv11.3/KCNH7/ERG3, as well as rat (but not human) Kv11.2/KCNH6/ERG2 (PubMed:11755529, PubMed:11864985, PubMed:16497878, PubMed:17369411, PubMed:20600425) by binding to channel outer vestibule (S5P domain) with a 1:1 stoichiometry (PubMed:11755529, PubMed:11864985, PubMed:17369411, PubMed:20600425). Inhibition data are the following: hERG1 (reversible, IC(50)~7 nM) (PubMed:11755529, PubMed:11864985, PubMed:16497878, PubMed:17369411, PubMed:20600425), rERG1 (reversible, Kd=6.8 nM) (PubMed:16497878), rERG2 (irreversible, Kd=2.8 nM) (PubMed:16497878), hERG3 (irreversible, Kd=4.05 nM) (PubMed:16497878) and rERG3 (reversible, Kd=38.1 nM) (PubMed:16497878) potassium channels. The toxin potency is not affected by elevating potassium ion concentration from 2 to 98 mM (PubMed:11864985). This toxin only blocks channels in a closed state (PubMed:12860380). At high toxin concentrations, block of Kv11.1/KCNH2/ERG1 macroscopic current is incomplete (93.5%). This suggests a kinetic mechanism model with two different states of toxin-channel binding (T+C=TC*=TC; in the TC* state, the toxin binds the channel but does not occlude the pore, whereas in the TC state the toxin binds and occludes the pore). In this model, incomplete block is explained by the relatively fast dissociation rate from the blocked channel conformation (TC) relative to the rate of conversion of the toxin-channel encounter complex (TC*) to the blocked channel conformation (TC) (PubMed:17369411).<ref>PMID:10224238</ref> <ref>PMID:11755529</ref> <ref>PMID:11864985</ref> <ref>PMID:12860380</ref> <ref>PMID:16497878</ref> <ref>PMID:17369411</ref> <ref>PMID:20600425</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/ne/1ne5_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=1ne5 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The three-dimensional structure of chemically synthesized CnErg1 (Ergtoxin), which specifically blocks HERG (human ether-a-go-go-related gene) K+ channels, was determined by nuclear magnetic resonance spectroscopy. CnErg1 consists of a triple-stranded beta-sheet and an alpha-helix, as is typical of K+ channel scorpion toxins. The peptide structure differs from the canonical structures in that the first beta-strand is shorter and is nearer to the second beta-strand rather than to the third beta-strand on the C-terminus. There is also a large hydrophobic patch on the surface of the toxin, surrounding a central lysine residue, Lys13. We postulate that this hydrophobic patch is likely to form part of the binding surface of the toxin.


===Solution Strucuture of HERG Specific Scorpion Toxin CnErg1===
Solution structure of CnErg1 (Ergtoxin), a HERG specific scorpion toxin.,Torres AM, Bansal P, Alewood PF, Bursill JA, Kuchel PW, Vandenberg JI FEBS Lett. 2003 Mar 27;539(1-3):138-42. PMID:12650941<ref>PMID:12650941</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ne5" style="background-color:#fffaf0;"></div>


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==See Also==
The line below this paragraph, {{ABSTRACT_PUBMED_12650941}}, adds the Publication Abstract to the page
*[[Potassium channel toxin 3D structures|Potassium channel toxin 3D structures]]
(as it appears on PubMed at http://www.pubmed.gov), where 12650941 is the PubMed ID number.
== References ==
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<references/>
{{ABSTRACT_PUBMED_12650941}}
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</StructureSection>
==About this Structure==
[[Category: Centruroides noxius]]
1NE5 is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NE5 OCA].
[[Category: Large Structures]]
 
[[Category: Alewood P]]
==Reference==
[[Category: Kuchel PW]]
<ref group="xtra">PMID:12650941</ref><references group="xtra"/>
[[Category: Paramjit B]]
[[Category: Alewood, P.]]
[[Category: Torres AM]]
[[Category: Kuchel, P W.]]
[[Category: Vandenberg JI]]
[[Category: Paramjit, B.]]
[[Category: Torres, A M.]]
[[Category: Vandenberg, J I.]]
[[Category: Alpha-helix]]
[[Category: Triple-stranded beta-sheet]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Feb 18 00:06:56 2009''

Latest revision as of 11:39, 6 November 2024

Solution Structure of HERG Specific Scorpion Toxin CnErg1Solution Structure of HERG Specific Scorpion Toxin CnErg1

Structural highlights

1ne5 is a 1 chain structure with sequence from Centruroides noxius. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR, 20 models
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

KGX11_CENNO Blocks human and rat Kv11.1/KCNH2/ERG1 and Kv11.3/KCNH7/ERG3, as well as rat (but not human) Kv11.2/KCNH6/ERG2 (PubMed:11755529, PubMed:11864985, PubMed:16497878, PubMed:17369411, PubMed:20600425) by binding to channel outer vestibule (S5P domain) with a 1:1 stoichiometry (PubMed:11755529, PubMed:11864985, PubMed:17369411, PubMed:20600425). Inhibition data are the following: hERG1 (reversible, IC(50)~7 nM) (PubMed:11755529, PubMed:11864985, PubMed:16497878, PubMed:17369411, PubMed:20600425), rERG1 (reversible, Kd=6.8 nM) (PubMed:16497878), rERG2 (irreversible, Kd=2.8 nM) (PubMed:16497878), hERG3 (irreversible, Kd=4.05 nM) (PubMed:16497878) and rERG3 (reversible, Kd=38.1 nM) (PubMed:16497878) potassium channels. The toxin potency is not affected by elevating potassium ion concentration from 2 to 98 mM (PubMed:11864985). This toxin only blocks channels in a closed state (PubMed:12860380). At high toxin concentrations, block of Kv11.1/KCNH2/ERG1 macroscopic current is incomplete (93.5%). This suggests a kinetic mechanism model with two different states of toxin-channel binding (T+C=TC*=TC; in the TC* state, the toxin binds the channel but does not occlude the pore, whereas in the TC state the toxin binds and occludes the pore). In this model, incomplete block is explained by the relatively fast dissociation rate from the blocked channel conformation (TC) relative to the rate of conversion of the toxin-channel encounter complex (TC*) to the blocked channel conformation (TC) (PubMed:17369411).[1] [2] [3] [4] [5] [6] [7]

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 PubMed

The three-dimensional structure of chemically synthesized CnErg1 (Ergtoxin), which specifically blocks HERG (human ether-a-go-go-related gene) K+ channels, was determined by nuclear magnetic resonance spectroscopy. CnErg1 consists of a triple-stranded beta-sheet and an alpha-helix, as is typical of K+ channel scorpion toxins. The peptide structure differs from the canonical structures in that the first beta-strand is shorter and is nearer to the second beta-strand rather than to the third beta-strand on the C-terminus. There is also a large hydrophobic patch on the surface of the toxin, surrounding a central lysine residue, Lys13. We postulate that this hydrophobic patch is likely to form part of the binding surface of the toxin.

Solution structure of CnErg1 (Ergtoxin), a HERG specific scorpion toxin.,Torres AM, Bansal P, Alewood PF, Bursill JA, Kuchel PW, Vandenberg JI FEBS Lett. 2003 Mar 27;539(1-3):138-42. PMID:12650941[8]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

See Also

References

  1. ↑ Gurrola GB, Rosati B, Rocchetti M, Pimienta G, Zaza A, Arcangeli A, Olivotto M, Possani LD, Wanke E. A toxin to nervous, cardiac, and endocrine ERG K+ channels isolated from Centruroides noxius scorpion venom. FASEB J. 1999 May;13(8):953-62. PMID:10224238
  2. ↑ Pardo-Lopez L, Garcia-Valdes J, Gurrola GB, Robertson GA, Possani LD. Mapping the receptor site for ergtoxin, a specific blocker of ERG channels. FEBS Lett. 2002 Jan 2;510(1-2):45-9. PMID:11755529
  3. ↑ Pardo-Lopez L, Zhang M, Liu J, Jiang M, Possani LD, Tseng GN. Mapping the binding site of a human ether-a-go-go-related gene-specific peptide toxin (ErgTx) to the channel's outer vestibule. J Biol Chem. 2002 May 10;277(19):16403-11. Epub 2002 Feb 25. PMID:11864985 doi:http://dx.doi.org/10.1074/jbc.M200460200
  4. ↑ Milnes JT, Dempsey CE, Ridley JM, Crociani O, Arcangeli A, Hancox JC, Witchel HJ. Preferential closed channel blockade of HERG potassium currents by chemically synthesised BeKm-1 scorpion toxin. FEBS Lett. 2003 Jul 17;547(1-3):20-6. PMID:12860380
  5. ↑ Restano-Cassulini R, Korolkova YV, Diochot S, Gurrola G, Guasti L, Possani LD, Lazdunski M, Grishin EV, Arcangeli A, Wanke E. Species diversity and peptide toxins blocking selectivity of ether-a-go-go-related gene subfamily K+ channels in the central nervous system. Mol Pharmacol. 2006 May;69(5):1673-83. Epub 2006 Feb 23. PMID:16497878 doi:http://dx.doi.org/10.1124/mol.105.019729
  6. ↑ Hill AP, Sunde M, Campbell TJ, Vandenberg JI. Mechanism of block of the hERG K+ channel by the scorpion toxin CnErg1. Biophys J. 2007 Jun 1;92(11):3915-29. Epub 2007 Mar 16. PMID:17369411 doi:http://dx.doi.org/10.1529/biophysj.106.101956
  7. ↑ Jimenez-Vargas JM, Restano-Cassulini R, Quintero-Hernandez V, Gurrola GB, Possani LD. Recombinant expression of the toxic peptide ErgTx1 and role of Met35 on its stability and function. Peptides. 2011 Mar;32(3):560-7. doi: 10.1016/j.peptides.2010.06.018. Epub 2010, Jun 30. PMID:20600425 doi:http://dx.doi.org/10.1016/j.peptides.2010.06.018
  8. ↑ Torres AM, Bansal P, Alewood PF, Bursill JA, Kuchel PW, Vandenberg JI. Solution structure of CnErg1 (Ergtoxin), a HERG specific scorpion toxin. FEBS Lett. 2003 Mar 27;539(1-3):138-42. PMID:12650941
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