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<StructureSection load='1g4y' size='340' side='right'caption='[[1g4y]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
<StructureSection load='1g4y' size='340' side='right'caption='[[1g4y]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1g4y]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G4Y OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1G4Y FirstGlance]. <br>
<table><tr><td colspan='2'>[[1g4y]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G4Y OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1G4Y FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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]] 1.6&#8491;</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=1g4y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g4y OCA], [http://pdbe.org/1g4y PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1g4y RCSB], [http://www.ebi.ac.uk/pdbsum/1g4y PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1g4y ProSAT]</span></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1g4y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g4y OCA], [https://pdbe.org/1g4y PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1g4y RCSB], [https://www.ebi.ac.uk/pdbsum/1g4y PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1g4y ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/KCNN2_RAT KCNN2_RAT]] Forms a voltage-independent potassium channel activated by intracellular calcium. Activation is followed by membrane hyperpolarization. Thought to regulate neuronal excitability by contributing to the slow component of synaptic afterhyperpolarization. The channel is blocked by apamin.  
[https://www.uniprot.org/uniprot/KCNN2_RAT KCNN2_RAT] Forms a voltage-independent potassium channel activated by intracellular calcium. Activation is followed by membrane hyperpolarization. Thought to regulate neuronal excitability by contributing to the slow component of synaptic afterhyperpolarization. The channel is blocked by apamin.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1g4y ConSurf].
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1g4y ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Small-conductance Ca2+-activated K+ channels (SK channels) are independent of voltage and gated solely by intracellular Ca2+. These membrane channels are heteromeric complexes that comprise pore-forming alpha-subunits and the Ca2+-binding protein calmodulin (CaM). CaM binds to the SK channel through the CaM-binding domain (CaMBD), which is located in an intracellular region of the alpha-subunit immediately carboxy-terminal to the pore. Channel opening is triggered when Ca2+ binds the EF hands in the N-lobe of CaM. Here we report the 1.60 A crystal structure of the SK channel CaMBD/Ca2+/CaM complex. The CaMBD forms an elongated dimer with a CaM molecule bound at each end; each CaM wraps around three alpha-helices, two from one CaMBD subunit and one from the other. As only the CaM N-lobe has bound Ca2+, the structure provides a view of both calcium-dependent and -independent CaM/protein interactions. Together with biochemical data, the structure suggests a possible gating mechanism for the SK channel.
Structure of the gating domain of a Ca2+-activated K+ channel complexed with Ca2+/calmodulin.,Schumacher MA, Rivard AF, Bachinger HP, Adelman JP Nature. 2001 Apr 26;410(6832):1120-4. PMID:11323678<ref>PMID:11323678</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1g4y" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Calmodulin 3D structures|Calmodulin 3D structures]]
*[[Calmodulin 3D structures|Calmodulin 3D structures]]
*[[Potassium Channel|Potassium Channel]]
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Adelman, J P]]
[[Category: Rattus norvegicus]]
[[Category: Bachinger, H P]]
[[Category: Adelman JP]]
[[Category: Rivard, A]]
[[Category: Bachinger HP]]
[[Category: Schumacher, M A]]
[[Category: Rivard A]]
[[Category: Calmodulin]]
[[Category: Schumacher MA]]
[[Category: Channel gating]]
[[Category: Signaling protein]]
[[Category: Small-conductance calcium-activated potassium channel]]
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