View source for 1zto


==INACTIVATION GATE OF POTASSIUM CHANNEL RCK4, NMR, 8 STRUCTURES==
<StructureSection load='1zto' size='340' side='right'caption='[[1zto]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1zto]] 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=1ZTO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ZTO 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='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AAR:ARGININEAMIDE'>AAR</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=1zto FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zto OCA], [https://pdbe.org/1zto PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1zto RCSB], [https://www.ebi.ac.uk/pdbsum/1zto PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1zto ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/KCNA4_RAT KCNA4_RAT] Mediates the voltage-dependent potassium ion permeability of excitable membranes. Assuming opened or closed conformations in response to the voltage difference across the membrane, the protein forms a potassium-selective channel through which potassium ions may pass in accordance with their electrochemical gradient.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The electrical signalling properties of neurons originate largely from the gating properties of their ion channels. N-type inactivation of voltage-gated potassium (Kv) channels is the best-understood gating transition in ion channels, and occurs by a 'ball-and-chain' type mechanism. In this mechanism an N-terminal domain (inactivation gate), which is tethered to the cytoplasmic side of the channel protein by a protease-cleavable chain, binds to its receptor at the inner vestibule of the channel, thereby physically blocking the pore. Even when synthesized as a peptide, ball domains restore inactivation in Kv channels whose inactivation domains have been deleted. Using high-resolution nuclear magnetic resonance (NMR) spectroscopy, we analysed the three-dimensional structure of the ball peptides from two rapidly inactivating mammalian K. channels (Raw3 (Kv3.4) and RCK4 (Kv1.4)). The inactivation peptide of Raw3 (Raw3-IP) has a compact structure that exposes two phosphorylation sites and allows the formation of an intramolecular disulphide bridge between two spatially close cysteine residues. Raw3-IP exhibits a characteristic surface charge pattern with a positively charged, a hydrophobic, and a negatively charged region. The RCK4 inactivation peptide (RCK4-IP) shows a similar spatial distribution of charged and uncharged regions, but is more flexible and less ordered in its amino-terminal part.

NMR structure of inactivation gates from mammalian voltage-dependent potassium channels.,Antz C, Geyer M, Fakler B, Schott MK, Guy HR, Frank R, Ruppersberg JP, Kalbitzer HR Nature. 1997 Jan 16;385(6613):272-5. PMID:9000078<ref>PMID:9000078</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1zto" style="background-color:#fffaf0;"></div>

==See Also==
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Antz C]]
[[Category: Fakler B]]
[[Category: Frank R]]
[[Category: Geyer M]]
[[Category: Guy HR]]
[[Category: Kalbitzer HR]]
[[Category: Ruppersberg JP]]
[[Category: Schott M]]