3spj: Difference between revisions

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<StructureSection load='3spj' size='340' side='right'caption='[[3spj]], [[Resolution|resolution]] 3.31&Aring;' scene=''>
<StructureSection load='3spj' size='340' side='right'caption='[[3spj]], [[Resolution|resolution]] 3.31&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[3spj]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Chick Chick]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SPJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3SPJ FirstGlance]. <br>
<table><tr><td colspan='2'>[[3spj]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SPJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3SPJ FirstGlance]. <br>
</td></tr><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>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.307&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3spc|3spc]], [[3spg|3spg]], [[3sph|3sph]], [[3spi|3spi]]</div></td></tr>
<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='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Kir2.2 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9031 CHICK])</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=3spj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3spj OCA], [https://pdbe.org/3spj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3spj RCSB], [https://www.ebi.ac.uk/pdbsum/3spj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3spj 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=3spj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3spj OCA], [https://pdbe.org/3spj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3spj RCSB], [https://www.ebi.ac.uk/pdbsum/3spj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3spj ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/KCJ12_CHICK KCJ12_CHICK]] Inward rectifying potassium channel that is activated by phosphatidylinositol 4,5-bisphosphate and that probably participates in controlling the resting membrane potential in electrically excitable cells. Inward rectifier potassium channels are characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. The inward rectification is probably due to the blockage of outward current by cytoplasmic polyamines and/or magnesium ions.<ref>PMID:20019282</ref> <ref>PMID:21874019</ref> 
[https://www.uniprot.org/uniprot/KCJ12_CHICK KCJ12_CHICK] Inward rectifying potassium channel that is activated by phosphatidylinositol 4,5-bisphosphate and that probably participates in controlling the resting membrane potential in electrically excitable cells. Inward rectifier potassium channels are characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. The inward rectification is probably due to the blockage of outward current by cytoplasmic polyamines and/or magnesium ions.<ref>PMID:20019282</ref> <ref>PMID:21874019</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The regulation of ion channel activity by specific lipid molecules is widely recognized as an integral component of electrical signalling in cells. In particular, phosphatidylinositol 4,5-bisphosphate (PIP(2)), a minor yet dynamic phospholipid component of cell membranes, is known to regulate many different ion channels. PIP(2) is the primary agonist for classical inward rectifier (Kir2) channels, through which this lipid can regulate a cell's resting membrane potential. However, the molecular mechanism by which PIP(2) exerts its action is unknown. Here we present the X-ray crystal structure of a Kir2.2 channel in complex with a short-chain (dioctanoyl) derivative of PIP(2). We found that PIP(2) binds at an interface between the transmembrane domain (TMD) and the cytoplasmic domain (CTD). The PIP(2)-binding site consists of a conserved non-specific phospholipid-binding region in the TMD and a specific phosphatidylinositol-binding region in the CTD. On PIP(2) binding, a flexible expansion linker contracts to a compact helical structure, the CTD translates 6 A and becomes tethered to the TMD and the inner helix gate begins to open. In contrast, the small anionic lipid dioctanoyl glycerol pyrophosphatidic acid (PPA) also binds to the non-specific TMD region, but not to the specific phosphatidylinositol region, and thus fails to engage the CTD or open the channel. Our results show how PIP(2) can control the resting membrane potential through a specific ion-channel-receptor-ligand interaction that brings about a large conformational change, analogous to neurotransmitter activation of ion channels at synapses.
 
Structural basis of PIP(2) activation of the classical inward rectifier K(+) channel Kir2.2.,Hansen SB, Tao X, Mackinnon R Nature. 2011 Aug 28. doi: 10.1038/nature10370. PMID:21874019<ref>PMID:21874019</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3spj" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Chick]]
[[Category: Gallus gallus]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Hansen, S B]]
[[Category: Hansen SB]]
[[Category: MacKinnon, R]]
[[Category: MacKinnon R]]
[[Category: Tao, X]]
[[Category: Tao X]]
[[Category: Lipid]]
[[Category: Membrane protein]]
[[Category: Metal transport]]
[[Category: Pip]]
[[Category: Receptor]]

Revision as of 16:04, 14 March 2024

Apo inward rectifier potassium channel Kir2.2 I223L mutantApo inward rectifier potassium channel Kir2.2 I223L mutant

Structural highlights

3spj is a 1 chain structure with sequence from Gallus gallus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3.307Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

KCJ12_CHICK Inward rectifying potassium channel that is activated by phosphatidylinositol 4,5-bisphosphate and that probably participates in controlling the resting membrane potential in electrically excitable cells. Inward rectifier potassium channels are characterized by a greater tendency to allow potassium to flow into the cell rather than out of it. The inward rectification is probably due to the blockage of outward current by cytoplasmic polyamines and/or magnesium ions.[1] [2]

See Also

References

  1. ↑ Tao X, Avalos JL, Chen J, MacKinnon R. Crystal structure of the eukaryotic strong inward-rectifier K+ channel Kir2.2 at 3.1 A resolution. Science. 2009 Dec 18;326(5960):1668-74. PMID:20019282 doi:326/5960/1668
  2. ↑ Hansen SB, Tao X, Mackinnon R. Structural basis of PIP(2) activation of the classical inward rectifier K(+) channel Kir2.2. Nature. 2011 Aug 28. doi: 10.1038/nature10370. PMID:21874019 doi:10.1038/nature10370

3spj, resolution 3.31Å

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