View source for 2k44


==Solution structure of a K+-channel voltage-sensor paddle domain==
<StructureSection load='2k44' size='340' side='right'caption='[[2k44]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2k44]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2K44 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2K44 FirstGlance]. <br>
</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'>[https://proteopedia.org/fgij/fg.htm?mol=2k44 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k44 OCA], [https://pdbe.org/2k44 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2k44 RCSB], [https://www.ebi.ac.uk/pdbsum/2k44 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2k44 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/KCMA1_HUMAN KCMA1_HUMAN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Voltage-gated potassium channels open and close in response to changes in the membrane potential. In this study we have determined the NMR solution structure of the putative S3b-S4 voltage-sensor paddle fragment, the part that moves to mediate voltage-gating, of the HsapBK potassium channel in dodecylphosphocholine (DPC) micelles. This paper presents the first structure of the S3b-S4 fragment from a BK channel. Diffusion coefficients as determined from PFG NMR experiments showed that a well-defined complex between the peptide and DPC molecules was formed. The structure reveals a helix-turn-helix motif, which is in agreement with crystal structures of other voltage-gated potassium channels, thus indicating that it is feasible to study the isolated fragment. The paddle motifs generally contain several basic residues, implicated in the gating. The critical Arg residues in the present structure all reside on the surface, which is in agreement with crystal structures of Kv channels. Similarities in the structure of the S3b-S4 fragment in BK and Kv channels, as well as important differences are seen, which may be important for explaining the details in paddle movement within a bilayer.

Solution structure of the HsapBK K+-channel voltage-sensor paddle sequence.,Unnerstale S, Lind J, Papadopoulos E, Maler L Biochemistry. 2009 May 20. PMID:19456106<ref>PMID:19456106</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2k44" style="background-color:#fffaf0;"></div>

==See Also==
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Lind J]]
[[Category: Maler L]]
[[Category: Papadopoulos E]]
[[Category: Unnerstale S]]