2ih3: Difference between revisions
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<StructureSection load='2ih3' size='340' side='right' caption='[[2ih3]], [[Resolution|resolution]] 1.72Å' scene=''> | <StructureSection load='2ih3' size='340' side='right' caption='[[2ih3]], [[Resolution|resolution]] 1.72Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[2ih3]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/ | <table><tr><td colspan='2'>[[2ih3]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/"actinomyces_lividans"_krasil'nikov_et_al._1965 "actinomyces lividans" krasil'nikov et al. 1965] and [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2IH3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2IH3 FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=1EM:(1S)-2-HYDROXY-1-[(NONANOYLOXY)METHYL]ETHYL+MYRISTATE'>1EM</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=1EM:(1S)-2-HYDROXY-1-[(NONANOYLOXY)METHYL]ETHYL+MYRISTATE'>1EM</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene></td></tr> | ||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=DAL:D-ALANINE'>DAL</scene></td></tr> | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=DAL:D-ALANINE'>DAL</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2ih1|2ih1]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2ih1|2ih1]]</td></tr> | ||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">kcsA, skc1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1916 | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">kcsA, skc1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1916 "Actinomyces lividans" Krasil'nikov et al. 1965])</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=2ih3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ih3 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2ih3 RCSB], [http://www.ebi.ac.uk/pdbsum/2ih3 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=2ih3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ih3 OCA], [http://pdbe.org/2ih3 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2ih3 RCSB], [http://www.ebi.ac.uk/pdbsum/2ih3 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 2ih3" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Actinomyces lividans krasil'nikov et al. 1965]] | |||
[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
[[Category: Leonetti, M]] | [[Category: Leonetti, M]] | ||
[[Category: MacKinnon, R]] | [[Category: MacKinnon, R]] | ||
Revision as of 09:47, 10 September 2015
Ion selectivity in a semi-synthetic K+ channel locked in the conductive conformationIon selectivity in a semi-synthetic K+ channel locked in the conductive conformation
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 PubMedPotassium channels are K+-selective protein pores in cell membrane. The selectivity filter is the functional unit that allows K+ channels to distinguish potassium (K+) and sodium (Na+) ions. The filter's structure depends on whether K+ or Na+ ions are bound inside it. We synthesized a K+ channel containing the d-enantiomer of alanine in place of a conserved glycine and found by x-ray crystallography that its filter maintains the K+ (conductive) structure in the presence of Na+ and very low concentrations of K+. This channel conducts Na+ in the absence of K+ but not in the presence of K+. These findings demonstrate that the ability of the channel to adapt its structure differently to K+ and Na+ is a fundamental aspect of ion selectivity, as is the ability of multiple K+ ions to compete effectively with Na+ for the conductive filter. Ion selectivity in a semisynthetic K+ channel locked in the conductive conformation.,Valiyaveetil FI, Leonetti M, Muir TW, Mackinnon R Science. 2006 Nov 10;314(5801):1004-7. PMID:17095703[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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