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1quz

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Revision as of 23:30, 10 September 2015

Solution structure of the potassium channel scorpion toxin HSTX1

Structural highlights

1quz is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[KAX63_HETSP] Potently blocks voltage-gated potassium channels Kv1.1/KCNA1 and Kv1.3/KCNA3. Mildly blocks intermediate (IK) conductance calcium-activated potassium channels (KCa3.1/KCNN4) and ERG1/Kv11.1/KCNH2.^[1] ^[2] ^[3]

Publication Abstract from PubMed

We have determined the three-dimensional structure of the potassium channel inhibitor HsTX1, using nuclear magnetic resonance and molecular modeling. This protein belongs to the scorpion short toxin family, which essentially contains potassium channel blockers of 29 to 39 amino acids and three disulfide bridges. It is highly active on voltage-gated Kv1.3 potassium channels. Furthermore, it has the particularity to possess a fourth disulfide bridge. We show that HsTX1 has a fold similar to that of the three-disulfide-bridged toxins and conserves the hydrophobic core found in the scorpion short toxins. Thus, the fourth bridge has no influence on the global conformation of HsTX1. Most residues spatially analogous to those interacting with voltage-gated potassium channels in the three-disulfide-bridged toxins are conserved in HsTX1. Thus, we propose that Tyr21, Lys23, Met25, and Asn26 are involved in the biological activity of HsTX1. As an additional positively charged residue is always spatially close to the aromatic residue in toxins blocking the voltage-gated potassium channels, and as previous mutagenesis experiments have shown the critical role played by the C-terminus in HsTX1, we suggest that Arg33 is also important for the activity of the four disulfide-bridged toxin. Docking calculations confirm that, if Lys23 and Met25 interact with the GYGDMH motif of Kv1.3, Arg33 can contact Asp386 and, thus, play the role of the additional positively charged residue of the toxin functional site. This original configuration of the binding site of HsTX1 for Kv1.3, if confirmed experimentally, offers new structural possibilities for the construction of a molecule blocking the voltage-gated potassium channels.

Structural and functional consequences of the presence of a fourth disulfide bridge in the scorpion short toxins: solution structure of the potassium channel inhibitor HsTX1.,Savarin P, Romi-Lebrun R, Zinn-Justin S, Lebrun B, Nakajima T, Gilquin B, Menez A Protein Sci. 1999 Dec;8(12):2672-85. PMID:10631983^[4]

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

References

↑ Regaya I, Beeton C, Ferrat G, Andreotti N, Darbon H, De Waard M, Sabatier JM. Evidence for domain-specific recognition of SK and Kv channels by MTX and HsTx1 scorpion toxins. J Biol Chem. 2004 Dec 31;279(53):55690-6. Epub 2004 Oct 21. PMID:15498765 doi:M410055200
↑ Abdel-Mottaleb Y, Corzo G, Martin-Eauclaire MF, Satake H, Ceard B, Peigneur S, Nambaru P, Bougis PE, Possani LD, Tytgat J. A common "hot spot" confers hERG blockade activity to alpha-scorpion toxins affecting K+ channels. Biochem Pharmacol. 2008 Sep 15;76(6):805-15. doi: 10.1016/j.bcp.2008.07.008. Epub, 2008 Jul 18. PMID:18687312 doi:http://dx.doi.org/10.1016/j.bcp.2008.07.008
↑ Lebrun B, Romi-Lebrun R, Martin-Eauclaire MF, Yasuda A, Ishiguro M, Oyama Y, Pongs O, Nakajima T. A four-disulphide-bridged toxin, with high affinity towards voltage-gated K+ channels, isolated from Heterometrus spinnifer (Scorpionidae) venom. Biochem J. 1997 Nov 15;328 ( Pt 1):321-7. PMID:9359871
↑ Savarin P, Romi-Lebrun R, Zinn-Justin S, Lebrun B, Nakajima T, Gilquin B, Menez A. Structural and functional consequences of the presence of a fourth disulfide bridge in the scorpion short toxins: solution structure of the potassium channel inhibitor HsTX1. Protein Sci. 1999 Dec;8(12):2672-85. PMID:10631983

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1quz"

@@ Line 4: / Line 4: @@
 <table><tr><td colspan='2'>[[1quz]] is a 1 chain structure. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QUZ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1QUZ FirstGlance]. <br>
 </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1quz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1quz OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1quz RCSB], [http://www.ebi.ac.uk/pdbsum/1quz PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1quz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1quz OCA], [http://pdbe.org/1quz PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1quz RCSB], [http://www.ebi.ac.uk/pdbsum/1quz PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/KAX63_HETSP KAX63_HETSP]] Potently blocks voltage-gated potassium channels Kv1.1/KCNA1 and Kv1.3/KCNA3. Mildly blocks intermediate (IK) conductance calcium-activated potassium channels (KCa3.1/KCNN4) and ERG1/Kv11.1/KCNH2.<ref>PMID:15498765</ref> <ref>PMID:18687312</ref> <ref>PMID:9359871</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 14: / Line 16: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1quz" style="background-color:#fffaf0;"></div>
 ==See Also==

1quz

From Proteopedia

Revision as of 23:30, 10 September 2015

Solution structure of the potassium channel scorpion toxin HSTX1

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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