1hp2

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[[Image:1hp2.png|left|200px]]
 
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==SOLUTION STRUCTURE OF A TOXIN FROM THE SCORPION TITYUS SERRULATUS (TSTX-K ALPHA) DETERMINED BY NMR.==
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The line below this paragraph, containing "STRUCTURE_1hp2", creates the "Structure Box" on the page.
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<StructureSection load='1hp2' size='340' side='right'caption='[[1hp2]]' scene=''>
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1hp2]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Tityus_serrulatus Tityus serrulatus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HP2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HP2 FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1hp2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hp2 OCA], [https://pdbe.org/1hp2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hp2 RCSB], [https://www.ebi.ac.uk/pdbsum/1hp2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hp2 ProSAT]</span></td></tr>
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{{STRUCTURE_1hp2| PDB=1hp2 | SCENE= }}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/KAX41_TITSE KAX41_TITSE] Potently blocks Kv1.1/KCNA1 (85%), Kv1.2/KCNA2 (91%), Kv1.3/KCNA3 (89%), Kv1.6/KCNA6 (94%), and Shaker (97%).<ref>PMID:12871837</ref> <ref>PMID:24590385</ref> <ref>PMID:7509073</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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A toxin from the scorpion Tityus serrulatus (TsTX-Kalpha) blocks native squid K(+) channels and their cloned counterpart, sqKv1A, at pH 8 ((native)K(d) approximately 20 nM; (sqKv1A)K(d) approximately 10 nM). In both cases, decreasing the pH below 7.0 significantly diminishes the TsTX-Kalpha effect (pK = 6.6). In the cloned squid channel, the pH dependence of the block is abolished by a single point mutation (H351G), and no change in toxin affinity was observed at higher pH values (pH &gt; or =8.0). To further investigate the TsTX-Kalpha-sqKv1A interaction, the three-dimensional structure of TsTX-Kalpha was determined in solution by NMR spectroscopy, and a model of the TsTX-Kalpha-sqKv1A complex was generated. As found for other alpha-K toxins such as charybdotoxin (CTX), site-directed mutagenesis at toxin residue K27 (K27A, K27R, and K27E) significantly reduced the toxin's affinity for sqKv1A channels. This is consistent with the TsTX-Kalpha-sqKv1A model reported here, which has K27 of the toxin inserted into the ion conduction pathway of the K(+) channel. This toxin-channel model also illustrates a possible mechanism for the pH-dependent block whereby lysine residues from TsTX-Kalpha (K6 and K23) are repelled by protonated H351 on sqKv1A at low pH.
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===SOLUTION STRUCTURE OF A TOXIN FROM THE SCORPION TITYUS SERRULATUS (TSTX-K ALPHA) DETERMINED BY NMR.===
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Interaction of a toxin from the scorpion Tityus serrulatus with a cloned K+ channel from squid (sqKv1A).,Ellis KC, Tenenholz TC, Jerng H, Hayhurst M, Dudlak CS, Gilly WF, Blaustein MP, Weber DJ Biochemistry. 2001 May 22;40(20):5942-53. PMID:11352729<ref>PMID:11352729</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 1hp2" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_11352729}}, adds the Publication Abstract to the page
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*[[Potassium channel toxin 3D structures|Potassium channel toxin 3D structures]]
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(as it appears on PubMed at http://www.pubmed.gov), where 11352729 is the PubMed ID number.
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== References ==
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<references/>
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{{ABSTRACT_PUBMED_11352729}}
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__TOC__
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</StructureSection>
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==About this Structure==
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[[Category: Large Structures]]
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1HP2 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Tityus_serrulatus Tityus serrulatus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HP2 OCA].
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==Reference==
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Interaction of a toxin from the scorpion Tityus serrulatus with a cloned K+ channel from squid (sqKv1A)., Ellis KC, Tenenholz TC, Jerng H, Hayhurst M, Dudlak CS, Gilly WF, Blaustein MP, Weber DJ, Biochemistry. 2001 May 22;40(20):5942-53. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11352729 11352729]
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[[Category: Single protein]]
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[[Category: Tityus serrulatus]]
[[Category: Tityus serrulatus]]
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[[Category: Blaustein, M P.]]
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[[Category: Blaustein MP]]
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[[Category: Ellis, K C.]]
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[[Category: Ellis KC]]
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[[Category: Gilly, W F.]]
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[[Category: Gilly WF]]
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[[Category: Tenenholz, T C.]]
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[[Category: Tenenholz TC]]
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[[Category: Weber, D J.]]
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[[Category: Weber DJ]]
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[[Category: Alpha-k toxin]]
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[[Category: K+ channel]]
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[[Category: Scorpion toxin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 08:29:22 2008''
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Current revision

SOLUTION STRUCTURE OF A TOXIN FROM THE SCORPION TITYUS SERRULATUS (TSTX-K ALPHA) DETERMINED BY NMR.

PDB ID 1hp2

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