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| ==Crystal structure of a coiled-coil tetramerization domain from Kv7.4 channels== | | ==Crystal structure of a coiled-coil tetramerization domain from Kv7.4 channels== |
| <StructureSection load='2ovc' size='340' side='right' caption='[[2ovc]], [[Resolution|resolution]] 2.07Å' scene=''> | | <StructureSection load='2ovc' size='340' side='right'caption='[[2ovc]], [[Resolution|resolution]] 2.07Å' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[2ovc]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OVC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2OVC FirstGlance]. <br> | | <table><tr><td colspan='2'>[[2ovc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OVC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2OVC FirstGlance]. <br> |
| </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">KCNQ4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.07Å</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=2ovc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ovc OCA], [http://pdbe.org/2ovc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ovc RCSB], [http://www.ebi.ac.uk/pdbsum/2ovc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2ovc ProSAT]</span></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=2ovc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ovc OCA], [https://pdbe.org/2ovc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ovc RCSB], [https://www.ebi.ac.uk/pdbsum/2ovc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ovc ProSAT]</span></td></tr> |
| </table> | | </table> |
| == Disease == | | == Disease == |
| [[http://www.uniprot.org/uniprot/KCNQ4_HUMAN KCNQ4_HUMAN]] Defects in KCNQ4 are the cause of deafness autosomal dominant type 2A (DFNA2A) [MIM:[http://omim.org/entry/600101 600101]]. DFNA2A is a form of sensorineural hearing loss. Sensorineural deafness results from damage to the neural receptors of the inner ear, the nerve pathways to the brain, or the area of the brain that receives sound information.<ref>PMID:10025409</ref> <ref>PMID:10369879</ref> <ref>PMID:10571947</ref> <ref>PMID:10925378</ref> <ref>PMID:21242547</ref> | | [https://www.uniprot.org/uniprot/KCNQ4_HUMAN KCNQ4_HUMAN] Defects in KCNQ4 are the cause of deafness autosomal dominant type 2A (DFNA2A) [MIM:[https://omim.org/entry/600101 600101]. DFNA2A is a form of sensorineural hearing loss. Sensorineural deafness results from damage to the neural receptors of the inner ear, the nerve pathways to the brain, or the area of the brain that receives sound information.<ref>PMID:10025409</ref> <ref>PMID:10369879</ref> <ref>PMID:10571947</ref> <ref>PMID:10925378</ref> <ref>PMID:21242547</ref> |
| == Function == | | == Function == |
| [[http://www.uniprot.org/uniprot/KCNQ4_HUMAN KCNQ4_HUMAN]] Probably important in the regulation of neuronal excitability. May underlie a potassium current involved in regulating the excitability of sensory cells of the cochlea. KCNQ4 channels are blocked by linopirdin, XE991 and bepridil, whereas clofilium is without significant effect. Muscarinic agonist oxotremorine-M strongly suppress KCNQ4 current in CHO cells in which cloned KCNQ4 channels were coexpressed with M1 muscarinic receptors.<ref>PMID:11245603</ref> | | [https://www.uniprot.org/uniprot/KCNQ4_HUMAN KCNQ4_HUMAN] Probably important in the regulation of neuronal excitability. May underlie a potassium current involved in regulating the excitability of sensory cells of the cochlea. KCNQ4 channels are blocked by linopirdin, XE991 and bepridil, whereas clofilium is without significant effect. Muscarinic agonist oxotremorine-M strongly suppress KCNQ4 current in CHO cells in which cloned KCNQ4 channels were coexpressed with M1 muscarinic receptors.<ref>PMID:11245603</ref> |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| Kv7.x (KCNQ) voltage-gated potassium channels form the cardiac and auditory I(Ks) current and the neuronal M-current. The five Kv7 subtypes have distinct assembly preferences encoded by a C-terminal cytoplasmic assembly domain, the A-domain Tail. Here, we present the high-resolution structure of the Kv7.4 A-domain Tail together with biochemical experiments that show that the domain is a self-assembling, parallel, four-stranded coiled coil. Structural analysis and biochemical studies indicate conservation of the coiled coil in all Kv7 subtypes and that a limited set of interactions encode assembly specificity determinants. Kv7 mutations have prominent roles in arrhythmias, deafness, and epilepsy. The structure together with biochemical data indicate that A-domain Tail arrhythmia mutations cluster on the solvent-accessible surface of the subunit interface at a likely site of action for modulatory proteins. Together, the data provide a framework for understanding Kv7 assembly specificity and the molecular basis of a distinct set of Kv7 channelopathies.
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| Structural insight into KCNQ (Kv7) channel assembly and channelopathy.,Howard RJ, Clark KA, Holton JM, Minor DL Jr Neuron. 2007 Mar 1;53(5):663-75. PMID:17329207<ref>PMID:17329207</ref>
| | ==See Also== |
| | | *[[Potassium channel 3D structures|Potassium channel 3D structures]] |
| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 2ovc" style="background-color:#fffaf0;"></div>
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| == References == | | == References == |
| <references/> | | <references/> |
| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Human]] | | [[Category: Homo sapiens]] |
| [[Category: Clark, K A]] | | [[Category: Large Structures]] |
| [[Category: Holton, J M]] | | [[Category: Clark KA]] |
| [[Category: Howard, R J]] | | [[Category: Holton JM]] |
| [[Category: Minor, D L]] | | [[Category: Howard RJ]] |
| [[Category: Coiled-coil]] | | [[Category: Minor DL]] |
| [[Category: Ion channel assembly]]
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| [[Category: Potassium channel]]
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| [[Category: Tetramer]]
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| [[Category: Transport protein]]
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| [[Category: Voltage-gated channel]]
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