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1pvz

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Revision as of 06:51, 11 September 2015

Solution Structure of BmP07, A Novel Potassium Channel Blocker from Scorpion Buthus martensi Karsch, 15 structures

Structural highlights

1pvz is a 1 chain structure with sequence from Mesobuthus martensii. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1du9, 1pnh, 1acw, 1scy
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[KA142_MESMA] Inhibits potassium channels. May be active towards small conductance calcium-activated potassium channels (KCNN, SK), and less active towards voltage-gated potassium channels (Kv/KCN).^[1] ^[2]

Publication Abstract from PubMed

A natural K+ channel blocker, BmKK2 (a member of scorpion toxin subfamily alpha-KTx 14), which is composed of 31 amino acid residues and purified from the venom of the Chinese scorpion Buthus martensi Karsch, was characterized using whole-cell patch-clamp recording in rat hippocampal neurons. The three dimensional structure of BmKK2 was determined with two-dimensional NMR spectroscopy and molecular modelling techniques. In solution this toxin adopted a common alpha/beta-motif, but showed distinct local conformation in the loop between alpha-helix and beta-sheet in comparison with typical short-chain scorpion toxins (e.g., CTX and NTX). Also, the alpha helix is shorter and the beta-sheet element is smaller (each strand consisted only two residues). The unusual structural feature of BmKK2 was attributed to the shorter loop between the alpha-helix and beta-sheet and the presence of two consecutive Pro residues at position 21 and 22 in the loop. Moreover, two models of BmKK2/hKv1.3 channel and BmKK2/rSK2 channel complexes were simulated with docking calculations. The results demonstrated the existence of a alpha-mode binding between the toxin and the channels. The model of BmKK2/rSK2 channel complex exhibited favorable contacts both in electrostatic and hydrophobic, including a network of five hydrogen bonds and bigger interface containing seven pairs of inter-residue interactions. In contrast, the model of BmKK2/hKv1.3 channel complex, containing only three pairs of inter-residue interactions, exhibited poor contacts and smaller interface. The results well explained its lower activity towards Kv channel, and predicted that it may prefer a type of SK channel with a narrower entryway as its specific receptor.

Solution structure of BmKK2, a new potassium channel blocker from the venom of chinese scorpion Buthus martensi Karsch.,Zhang N, Li M, Chen X, Wang Y, Wu G, Hu G, Wu H Proteins. 2004 Jun 1;55(4):835-45. PMID:15146482^[3]

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

References

↑ Zhang N, Li M, Chen X, Wang Y, Wu G, Hu G, Wu H. Solution structure of BmKK2, a new potassium channel blocker from the venom of chinese scorpion Buthus martensi Karsch. Proteins. 2004 Jun 1;55(4):835-45. PMID:15146482 doi:http://dx.doi.org/10.1002/prot.20117
↑ Li MH, Zhang NX, Chen XQ, Wu G, Wu H, Hu GY. Purification and pharmacological characterization of BmKK2 (alpha-KTx 14.2), a novel potassium channel-blocking peptide, from the venom of Asian scorpion Buthus martensi Karsch. Toxicon. 2004 Jun 15;43(8):895-900. PMID:15208022 doi:http://dx.doi.org/10.1016/j.toxicon.2003.11.028
↑ Zhang N, Li M, Chen X, Wang Y, Wu G, Hu G, Wu H. Solution structure of BmKK2, a new potassium channel blocker from the venom of chinese scorpion Buthus martensi Karsch. Proteins. 2004 Jun 1;55(4):835-45. PMID:15146482 doi:http://dx.doi.org/10.1002/prot.20117

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/1pvz"

@@ Line 4: / Line 4: @@
 <table><tr><td colspan='2'>[[1pvz]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Mesobuthus_martensii Mesobuthus martensii]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PVZ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1PVZ FirstGlance]. <br>
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1du9|1du9]], [[1pnh|1pnh]], [[1acw|1acw]], [[1scy|1scy]]</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=1pvz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pvz OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1pvz RCSB], [http://www.ebi.ac.uk/pdbsum/1pvz 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=1pvz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pvz OCA], [http://pdbe.org/1pvz PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1pvz RCSB], [http://www.ebi.ac.uk/pdbsum/1pvz PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/KA142_MESMA KA142_MESMA]] Inhibits potassium channels. May be active towards small conductance calcium-activated potassium channels (KCNN, SK), and less active towards voltage-gated potassium channels (Kv/KCN).<ref>PMID:15146482</ref> <ref>PMID:15208022</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 1pvz" style="background-color:#fffaf0;"></div>
 ==See Also==

1pvz

From Proteopedia

Revision as of 06:51, 11 September 2015

Solution Structure of BmP07, A Novel Potassium Channel Blocker from Scorpion Buthus martensi Karsch, 15 structures

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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