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| | ==Solution Structure of BmP07, A Novel Potassium Channel Blocker from Scorpion Buthus martensi Karsch, 15 structures== | | ==Solution Structure of BmP07, A Novel Potassium Channel Blocker from Scorpion Buthus martensi Karsch, 15 structures== |
| - | <StructureSection load='1pvz' size='340' side='right' caption='[[1pvz]], [[NMR_Ensembles_of_Models | 15 NMR models]]' scene=''> | + | <StructureSection load='1pvz' size='340' side='right'caption='[[1pvz]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <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> | + | <table><tr><td colspan='2'>[[1pvz]] is a 1 chain structure with sequence from [https://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 [https://proteopedia.org/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> | + | </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'>[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], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1pvz ProSAT]</span></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=1pvz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pvz OCA], [https://pdbe.org/1pvz PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pvz RCSB], [https://www.ebi.ac.uk/pdbsum/1pvz PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pvz ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == 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> | + | [https://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;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | ==See Also== | | ==See Also== |
| - | *[[Potassium channel toxin|Potassium channel toxin]] | + | *[[Potassium channel toxin 3D structures|Potassium channel toxin 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| | + | [[Category: Large Structures]] |
| | [[Category: Mesobuthus martensii]] | | [[Category: Mesobuthus martensii]] |
| - | [[Category: Hu, G]] | + | [[Category: Hu G]] |
| - | [[Category: Li, M]] | + | [[Category: Li M]] |
| - | [[Category: Ou, L]] | + | [[Category: Ou L]] |
| - | [[Category: Wang, Y]] | + | [[Category: Wang Y]] |
| - | [[Category: Wu, H]] | + | [[Category: Wu H]] |
| - | [[Category: Zhang, N]] | + | [[Category: Zhang N]] |
| - | [[Category: Zhang, Q]] | + | [[Category: Zhang Q]] |
| - | [[Category: Alpha/beta scaffold]]
| + | |
| - | [[Category: Toxin]]
| + | |
| Structural highlights
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.
See Also
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
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