View source for 4chw


==The electron crystallography structure of the cAMP-free potassium channel MloK1==
<StructureSection load='4chw' size='340' side='right'caption='[[4chw]], [[Resolution|resolution]] 7.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4chw]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mesorhizobium_loti Mesorhizobium loti]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CHW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CHW FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron crystallography, [[Resolution|Resolution]] 7&#8491;</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='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4chw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4chw OCA], [https://pdbe.org/4chw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4chw RCSB], [https://www.ebi.ac.uk/pdbsum/4chw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4chw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CNGK1_RHILO CNGK1_RHILO] Cyclic nucleotide-regulated potassium channel activated by cAMP.<ref>PMID:15550244</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Cyclic nucleotide-modulated ion channels are important for signal transduction and pacemaking in eukaryotes. The molecular determinants of ligand gating in these channels are still unknown, mainly because of a lack of direct structural information. Here we report ligand-induced conformational changes in full-length MloK1, a cyclic nucleotide-modulated potassium channel from the bacterium Mesorhizobium loti, analysed by electron crystallography and atomic force microscopy. Upon cAMP binding, the cyclic nucleotide-binding domains move vertically towards the membrane, and directly contact the S1-S4 voltage sensor domains. This is accompanied by a significant shift and tilt of the voltage sensor domain helices. In both states, the inner pore-lining helices are in an 'open' conformation. We propose a mechanism in which ligand binding can favour pore opening via a direct interaction between the cyclic nucleotide-binding domains and voltage sensors. This offers a simple mechanistic hypothesis for the coupling between ligand gating and voltage sensing in eukaryotic HCN channels.

Ligand-induced structural changes in the cyclic nucleotide-modulated potassium channel MloK1.,Kowal J, Chami M, Baumgartner P, Arheit M, Chiu PL, Rangl M, Scheuring S, Schroder GF, Nimigean CM, Stahlberg H Nat Commun. 2014 Jan 28;5:3106. doi: 10.1038/ncomms4106. PMID:24469021<ref>PMID:24469021</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4chw" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ion channels 3D structures|Ion channels 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mesorhizobium loti]]
[[Category: Arheit M]]
[[Category: Baumgartner P]]
[[Category: Chami M]]
[[Category: Chiu PL]]
[[Category: Kowal J]]
[[Category: Nimigean CM]]
[[Category: Rangl M]]
[[Category: Scheuring S]]
[[Category: Schroeder GF]]
[[Category: Stahlberg H]]