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[[Image:1qx7.gif|left|200px]]
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{{STRUCTURE_1qx7|  PDB=1qx7  |  SCENE=  }}
'''Crystal structure of apoCaM bound to the gating domain of small conductance Ca2+-activated potassium channel'''


==Crystal structure of apoCaM bound to the gating domain of small conductance Ca2+-activated potassium channel==
<StructureSection load='1qx7' size='340' side='right'caption='[[1qx7]], [[Resolution|resolution]] 3.09&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qx7]] is a 6 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=1QX7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QX7 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.09&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=1qx7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qx7 OCA], [https://pdbe.org/1qx7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qx7 RCSB], [https://www.ebi.ac.uk/pdbsum/1qx7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qx7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CALM1_RAT CALM1_RAT] Calmodulin mediates the control of a large number of enzymes, ion channels, aquaporins and other proteins through calcium-binding. Among the enzymes to be stimulated by the calmodulin-calcium complex are a number of protein kinases and phosphatases. Together with CCP110 and centrin, is involved in a genetic pathway that regulates the centrosome cycle and progression through cytokinesis. Mediates calcium-dependent inactivation of CACNA1C. Positively regulates calcium-activated potassium channel activity of KCNN2.[UniProtKB:P62158]
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qx/1qx7_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=1qx7 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Small conductance Ca2+-activated K+ channels (SK channels) are composed of the pore-forming alpha subunit and calmodulin (CaM). CaM binds to a region of the alpha subunit called the CaM binding domain (CaMBD), located intracellular and immediately C-terminal to the inner helix gate, in either the presence or absence of Ca2+. SK gating occurs when Ca2+ binds the N lobe of CaM thereby transmitting the signal to the attached inner helix gate to open. Here we present crystal structures of apoCaM and apoCaM/SK2 CaMBD complex. Several apoCaM crystal forms with multiple (12) packing environments reveal the same EF hand domain-swapped dimer providing potentially new insight into CaM regulation. The apoCaM/SK2 CaMBD structure, combined with our Ca2+/CaM/CaMBD structure suggests that Ca2+ binding induces folding and dimerization of the CaMBD, which causes large CaMBD-CaM C lobe conformational changes, including a &gt;90 degrees rotation of the region of the CaMBD directly connected to the gate.


==Overview==
Crystal structures of apocalmodulin and an apocalmodulin/SK potassium channel gating domain complex.,Schumacher MA, Crum M, Miller MC Structure. 2004 May;12(5):849-60. PMID:15130477<ref>PMID:15130477</ref>
Small conductance Ca2+-activated K+ channels (SK channels) are composed of the pore-forming alpha subunit and calmodulin (CaM). CaM binds to a region of the alpha subunit called the CaM binding domain (CaMBD), located intracellular and immediately C-terminal to the inner helix gate, in either the presence or absence of Ca2+. SK gating occurs when Ca2+ binds the N lobe of CaM thereby transmitting the signal to the attached inner helix gate to open. Here we present crystal structures of apoCaM and apoCaM/SK2 CaMBD complex. Several apoCaM crystal forms with multiple (12) packing environments reveal the same EF hand domain-swapped dimer providing potentially new insight into CaM regulation. The apoCaM/SK2 CaMBD structure, combined with our Ca2+/CaM/CaMBD structure suggests that Ca2+ binding induces folding and dimerization of the CaMBD, which causes large CaMBD-CaM C lobe conformational changes, including a &gt;90 degrees rotation of the region of the CaMBD directly connected to the gate.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1QX7 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QX7 OCA].
</div>
<div class="pdbe-citations 1qx7" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Crystal structures of apocalmodulin and an apocalmodulin/SK potassium channel gating domain complex., Schumacher MA, Crum M, Miller MC, Structure. 2004 May;12(5):849-60. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15130477 15130477]
*[[Calmodulin 3D structures|Calmodulin 3D structures]]
[[Category: Protein complex]]
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Rattus norvegicus]]
[[Category: Crum, M.]]
[[Category: Crum M]]
[[Category: Miller, M C.]]
[[Category: Miller MC]]
[[Category: Schumacher, M A.]]
[[Category: Schumacher MA]]
[[Category: Apocalmodulin]]
[[Category: Ca2+-activated gating]]
[[Category: Cambd]]
[[Category: Functioanl bipartism]]
[[Category: Gating domain]]
[[Category: Sk channel]]
[[Category: Small conductance ca2+ activated k+ channel]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 06:48:33 2008''
Retrieved from "https://proteopedia.org/1qx7"