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| | ==INACTIVATION GATE OF POTASSIUM CHANNEL RCK4, NMR, 8 STRUCTURES== | | ==INACTIVATION GATE OF POTASSIUM CHANNEL RCK4, NMR, 8 STRUCTURES== |
| - | <StructureSection load='1zto' size='340' side='right'caption='[[1zto]], [[NMR_Ensembles_of_Models | 8 NMR models]]' scene=''> | + | <StructureSection load='1zto' size='340' side='right'caption='[[1zto]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1zto]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. 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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ZTO FirstGlance]. <br> | + | <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='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=AAR:ARGININEAMIDE'>AAR</scene></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=1zto FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zto OCA], [http://pdbe.org/1zto PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1zto RCSB], [http://www.ebi.ac.uk/pdbsum/1zto PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1zto ProSAT]</span></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> | | </table> |
| | == Function == | | == Function == |
| - | [[http://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. | + | [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;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Antz, C]] | + | [[Category: Antz C]] |
| - | [[Category: Fakler, B]] | + | [[Category: Fakler B]] |
| - | [[Category: Frank, R]] | + | [[Category: Frank R]] |
| - | [[Category: Geyer, M]] | + | [[Category: Geyer M]] |
| - | [[Category: Guy, H R]] | + | [[Category: Guy HR]] |
| - | [[Category: Kalbitzer, H R]] | + | [[Category: Kalbitzer HR]] |
| - | [[Category: Ruppersberg, J P]] | + | [[Category: Ruppersberg JP]] |
| - | [[Category: Schott, M]] | + | [[Category: Schott M]] |
| - | [[Category: Inactivation gate]]
| + | |
| - | [[Category: Potassium channel]]
| + | |
| Structural highlights
Function
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.
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[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Antz C, Geyer M, Fakler B, Schott MK, Guy HR, Frank R, Ruppersberg JP, Kalbitzer HR. NMR structure of inactivation gates from mammalian voltage-dependent potassium channels. Nature. 1997 Jan 16;385(6613):272-5. PMID:9000078 doi:10.1038/385272a0
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