3or6: Difference between revisions
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==On the structural basis of modal gating behavior in K+channels - E71Q== | ==On the structural basis of modal gating behavior in K+channels - E71Q== | ||
<StructureSection load='3or6' size='340' side='right' caption='[[3or6]], [[Resolution|resolution]] 2.70Å' scene=''> | <StructureSection load='3or6' size='340' side='right'caption='[[3or6]], [[Resolution|resolution]] 2.70Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[3or6]] is a 3 chain structure with sequence from [ | <table><tr><td colspan='2'>[[3or6]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [https://en.wikipedia.org/wiki/Streptomyces_lividans Streptomyces lividans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3OR6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3OR6 FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7Å</td></tr> | ||
<tr id=' | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=K:POTASSIUM+ION'>K</scene></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3or6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3or6 OCA], [https://pdbe.org/3or6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3or6 RCSB], [https://www.ebi.ac.uk/pdbsum/3or6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3or6 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/KCSA_STRLI 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(+).<ref>PMID:7489706</ref> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
| Line 17: | Line 18: | ||
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 3or6" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Antibody|Antibody]] | *[[Antibody 3D structures|Antibody 3D structures]] | ||
*[[Potassium | *[[Potassium channel 3D structures|Potassium channel 3D structures]] | ||
*[[3D structures of non-human antibody|3D structures of non-human antibody]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | |||
[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
[[Category: Streptomyces lividans]] | [[Category: Streptomyces lividans]] | ||
[[Category: Chakrapani | [[Category: Chakrapani S]] | ||
[[Category: Cordero-Morales | [[Category: Cordero-Morales JF]] | ||
[[Category: Jogini | [[Category: Jogini V]] | ||
[[Category: Perozo | [[Category: Perozo E]] | ||
Latest revision as of 09:36, 27 November 2024
On the structural basis of modal gating behavior in K+channels - E71QOn the structural basis of modal gating behavior in K+channels - E71Q
Structural highlights
FunctionKCSA_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] Publication Abstract from PubMedModal-gating shifts represent an effective regulatory mechanism by which ion channels control the extent and time course of ionic fluxes. Under steady-state conditions, the K(+) channel KcsA shows three distinct gating modes, high-P(o), low-P(o) and a high-frequency flicker mode, each with about an order of magnitude difference in their mean open times. Here we show that in the absence of C-type inactivation, mutations at the pore-helix position Glu71 unmask a series of kinetically distinct modes of gating in a side chain-specific way. These gating modes mirror those seen in wild-type channels and suggest that specific interactions in the side chain network surrounding the selectivity filter, in concert with ion occupancy, alter the relative stability of pre-existing conformational states of the pore. The present results highlight the key role of the selectivity filter in regulating modal gating behavior in K(+) channels. On the structural basis of modal gating behavior in K(+) channels.,Chakrapani S, Cordero-Morales JF, Jogini V, Pan AC, Cortes DM, Roux B, Perozo E Nat Struct Mol Biol. 2011 Jan;18(1):67-74. Epub 2010 Dec 26. PMID:21186363[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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