6v1x: Difference between revisions

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<StructureSection load='6v1x' size='340' side='right'caption='[[6v1x]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
<StructureSection load='6v1x' size='340' side='right'caption='[[6v1x]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[6v1x]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Arath Arath]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6V1X OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6V1X FirstGlance]. <br>
<table><tr><td colspan='2'>[[6v1x]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6V1X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6V1X FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=QNJ:(3beta,5beta,14beta,17alpha)-cholestan-3-ol'>QNJ</scene>, <scene name='pdbligand=QNP:(2S)-1-(nonanoyloxy)-3-(phosphonooxy)propan-2-yl+tetradecanoate'>QNP</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.5&#8491;</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">KAT1, At5g46240, MPL12.2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 ARATH])</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=QNJ:(3beta,5beta,14beta,17alpha)-cholestan-3-ol'>QNJ</scene>, <scene name='pdbligand=QNP:(2S)-1-(nonanoyloxy)-3-(phosphonooxy)propan-2-yl+tetradecanoate'>QNP</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6v1x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6v1x OCA], [http://pdbe.org/6v1x PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6v1x RCSB], [http://www.ebi.ac.uk/pdbsum/6v1x PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6v1x 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=6v1x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6v1x OCA], [https://pdbe.org/6v1x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6v1x RCSB], [https://www.ebi.ac.uk/pdbsum/6v1x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6v1x ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/KAT1_ARATH KAT1_ARATH]] Highly selective inward-rectifying potassium channel. This voltage-gated channel could mediate long-term potassium influx into guard cells leading to stomatal opening. Assuming opened or closed conformations in response to the voltage difference across the membrane, the channel is activated by hyperpolarization. The channel activity is enhanced upon external acidification. Also permeable to ammonium ions. Blocked by tetraethylammonium and barium ions.<ref>PMID:8966547</ref>
[https://www.uniprot.org/uniprot/KAT1_ARATH KAT1_ARATH] Highly selective inward-rectifying potassium channel. This voltage-gated channel could mediate long-term potassium influx into guard cells leading to stomatal opening. Assuming opened or closed conformations in response to the voltage difference across the membrane, the channel is activated by hyperpolarization. The channel activity is enhanced upon external acidification. Also permeable to ammonium ions. Blocked by tetraethylammonium and barium ions.<ref>PMID:8966547</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Voltage-gated potassium (Kv) channels coordinate electrical signalling and control cell volume by gating in response to membrane depolarization or hyperpolarization. However, although voltage-sensing domains transduce transmembrane electric field changes by a common mechanism involving the outward or inward translocation of gating charges(1-3), the general determinants of channel gating polarity remain poorly understood(4). Here we suggest a molecular mechanism for electromechanical coupling and gating polarity in non-domain-swapped Kv channels on the basis of the cryo-electron microscopy structure of KAT1, the hyperpolarization-activated Kv channel from Arabidopsis thaliana. KAT1 displays a depolarized voltage sensor, which interacts with a closed pore domain directly via two interfaces and indirectly via an intercalated phospholipid. Functional evaluation of KAT1 structure-guided mutants at the sensor-pore interfaces suggests a mechanism in which direct interaction between the sensor and the C-linker hairpin in the adjacent pore subunit is the primary determinant of gating polarity. We suggest that an inward motion of the S4 sensor helix of approximately 5-7 A can underlie a direct-coupling mechanism, driving a conformational reorientation of the C-linker and ultimately opening the activation gate formed by the S6 intracellular bundle. This direct-coupling mechanism contrasts with allosteric mechanisms proposed for hyperpolarization-activated cyclic nucleotide-gated channels(5), and may represent an unexpected link between depolarization- and hyperpolarization-activated channels.


Electromechanical coupling in the hyperpolarization-activated K(+) channel KAT1.,Clark MD, Contreras GF, Shen R, Perozo E Nature. 2020 Jul;583(7814):145-149. doi: 10.1038/s41586-020-2335-4. Epub 2020 May, 27. PMID:32461693<ref>PMID:32461693</ref>
==See Also==
 
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6v1x" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Arath]]
[[Category: Arabidopsis thaliana]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Clark, M D]]
[[Category: Clark MD]]
[[Category: Contreras, G F]]
[[Category: Contreras GF]]
[[Category: Perozo, E]]
[[Category: Perozo E]]
[[Category: Shen, R]]
[[Category: Shen R]]
[[Category: Membrane protein]]
[[Category: Potassium channel]]
[[Category: Transport protein]]
[[Category: Voltage-gated ion channel]]

Latest revision as of 17:35, 6 March 2024

Cryo-EM Structure of the Hyperpolarization-Activated Potassium Channel KAT1: TetramerCryo-EM Structure of the Hyperpolarization-Activated Potassium Channel KAT1: Tetramer

Structural highlights

6v1x is a 4 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Electron Microscopy, Resolution 3.5Å
Ligands:,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

KAT1_ARATH Highly selective inward-rectifying potassium channel. This voltage-gated channel could mediate long-term potassium influx into guard cells leading to stomatal opening. Assuming opened or closed conformations in response to the voltage difference across the membrane, the channel is activated by hyperpolarization. The channel activity is enhanced upon external acidification. Also permeable to ammonium ions. Blocked by tetraethylammonium and barium ions.[1]

See Also

References

  1. ↑ Schachtman DP, Schroeder JI, Lucas WJ, Anderson JA, Gaber RF. Expression of an inward-rectifying potassium channel by the Arabidopsis KAT1 cDNA. Science. 1992 Dec 4;258(5088):1654-8. PMID:8966547

6v1x, resolution 3.50Å

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