1jvm: Difference between revisions
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<StructureSection load='1jvm' size='340' side='right' caption='[[1jvm]], [[Resolution|resolution]] 2.80Å' scene=''> | <StructureSection load='1jvm' size='340' side='right' caption='[[1jvm]], [[Resolution|resolution]] 2.80Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1jvm]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[1jvm]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/"actinomyces_lividans"_krasil'nikov_et_al._1965 "actinomyces lividans" krasil'nikov et al. 1965]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JVM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1JVM FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=RB:RUBIDIUM+ION'>RB</scene>, <scene name='pdbligand=TBA:TETRABUTYLAMMONIUM+ION'>TBA</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=RB:RUBIDIUM+ION'>RB</scene>, <scene name='pdbligand=TBA:TETRABUTYLAMMONIUM+ION'>TBA</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1j95|1j95]], [[1bl8|1bl8]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1j95|1j95]], [[1bl8|1bl8]]</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=1jvm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jvm OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1jvm RCSB], [http://www.ebi.ac.uk/pdbsum/1jvm PDBsum]</span></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=1jvm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jvm OCA], [http://pdbe.org/1jvm PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1jvm RCSB], [http://www.ebi.ac.uk/pdbsum/1jvm PDBsum]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 1jvm" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Actinomyces lividans krasil'nikov et al. 1965]] | ||
[[Category: MacKinnon, R]] | [[Category: MacKinnon, R]] | ||
[[Category: Morais-Cabral, J H]] | [[Category: Morais-Cabral, J H]] | ||
Revision as of 04:34, 11 September 2015
KCSA POTASSIUM CHANNEL WITH TBA (TETRABUTYLAMMONIUM) AND RUBIDIUMKCSA POTASSIUM CHANNEL WITH TBA (TETRABUTYLAMMONIUM) AND RUBIDIUM
Structural highlights
Function[KCSA_STRLI] Acts as a pH-gated potassium ion channel; changing the cytosolic pH from 7 to 4 opens the channel, although it is not clear if this is the physiological stimulus for channel opening. Monovalent cation preference is K(+) > Rb(+) > NH4(+) >> Na(+) > Li(+).[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe K+ selectivity filter catalyses the dehydration, transfer and rehydration of a K+ ion in about ten nanoseconds. This physical process is central to the production of electrical signals in biology. Here we show how nearly diffusion-limited rates are achieved, by analysing ion conduction and the corresponding crystallographic ion distribution in the selectivity filter of the KcsA K+ channel. Measurements with K+ and its slightly larger analogue, Rb+, lead us to conclude that the selectivity filter usually contains two K+ ions separated by one water molecule. The two ions move in a concerted fashion between two configurations, K+-water-K+-water (1,3 configuration) and water-K+-water-K+ (2,4 configuration), until a third ion enters, displacing the ion on the opposite side of the queue. For K+, the energy difference between the 1,3 and 2,4 configurations is close to zero, the condition of maximum conduction rate. The energetic balance between these configurations is a clear example of evolutionary optimization of protein function. Energetic optimization of ion conduction rate by the K+ selectivity filter.,Morais-Cabral JH, Zhou Y, MacKinnon R Nature. 2001 Nov 1;414(6859):37-42. PMID:11689935[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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