View source for 4jtc


==Crystal structure of Kv1.2-2.1 paddle chimera channel in complex with Charybdotoxin in Cs+==
<StructureSection load='4jtc' size='340' side='right'caption='[[4jtc]], [[Resolution|resolution]] 2.56&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4jtc]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Leiurus_hebraeus Leiurus hebraeus] and [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4JTC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4JTC FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.56&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CS:CESIUM+ION'>CS</scene>, <scene name='pdbligand=NAP:NADP+NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NAP</scene>, <scene name='pdbligand=PCA:PYROGLUTAMIC+ACID'>PCA</scene>, <scene name='pdbligand=PGW:(1R)-2-{[(S)-{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(HEXADECANOYLOXY)METHYL]ETHYL+(9Z)-OCTADEC-9-ENOATE'>PGW</scene></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=4jtc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4jtc OCA], [https://pdbe.org/4jtc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4jtc RCSB], [https://www.ebi.ac.uk/pdbsum/4jtc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4jtc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/KCAB2_RAT KCAB2_RAT] Accessory potassium channel protein which modulates the activity of the pore-forming alpha subunit.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Pore-blocking toxins inhibit voltage-dependent K(+) channels (Kv channels) by plugging the ion-conduction pathway. We have solved the crystal structure of paddle chimera, a Kv channel in complex with charybdotoxin (CTX), a pore-blocking toxin. The toxin binds to the extracellular pore entryway without producing discernable alteration of the selectivity filter structure and is oriented to project its Lys27 into the pore. The most extracellular K(+) binding site (S1) is devoid of K(+) electron-density when wild-type CTX is bound, but K(+) density is present to some extent in a Lys27Met mutant. In crystals with Cs(+) replacing K(+), S1 electron-density is present even in the presence of Lys27, a finding compatible with the differential effects of Cs(+) vs K(+) on CTX affinity for the channel. Together, these results show that CTX binds to a K(+) channel in a lock and key manner and interacts directly with conducting ions inside the selectivity filter. DOI:http://dx.doi.org/10.7554/eLife.00594.001.

Structure of a pore-blocking toxin in complex with a eukaryotic voltage-dependent K(+) channel.,Banerjee A, Lee A, Campbell E, Mackinnon R Elife. 2013 May 21;2:e00594. doi: 10.7554/eLife.00594. Print 2013. PMID:23705070<ref>PMID:23705070</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4jtc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
*[[Potassium channel toxin 3D structures|Potassium channel toxin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Leiurus hebraeus]]
[[Category: Rattus norvegicus]]
[[Category: Banerjee A]]
[[Category: Campbell E]]
[[Category: Lee A]]
[[Category: MacKinnon R]]