View source for 4r8c


==Crystal Structure of CNG mimicking NaK-ETPP mutant in complex with Rb+==
<StructureSection load='4r8c' size='340' side='right'caption='[[4r8c]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4r8c]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_cereus_ATCC_14579 Bacillus cereus ATCC 14579]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4R8C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4R8C 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLY:GLYCINE'>GLY</scene>, <scene name='pdbligand=MPD:(4S)-2-METHYL-2,4-PENTANEDIOL'>MPD</scene>, <scene name='pdbligand=RB:RUBIDIUM+ION'>RB</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=4r8c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4r8c OCA], [https://pdbe.org/4r8c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4r8c RCSB], [https://www.ebi.ac.uk/pdbsum/4r8c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4r8c ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q81HW2_BACCR Q81HW2_BACCR] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Cyclic nucleotide-gated (CNG) ion channels, despite a significant homology with the highly selective K+ channels, do not discriminate among monovalent alkali cations and are permeable also to several organic cations. We combined electrophysiology, molecular dynamics (MD) simulations, and X-ray crystallography to demonstrate that the pore of CNG channels is highly flexible. When a CNG mimic is crystallized in the presence of a variety of monovalent cations, including Na+, Cs+, and dimethylammonium (DMA+), the side chain of Glu66 in the selectivity filter shows multiple conformations and the diameter of the pore changes significantly. MD simulations indicate that Glu66 and the prolines in the outer vestibule undergo large fluctuations, which are modulated by the ionic species and the voltage. This flexibility underlies the coupling between gating and permeation and the poor ionic selectivity of CNG channels.

A structural, functional, and computational analysis suggests pore flexibility as the base for the poor selectivity of CNG channels.,Napolitano LM, Bisha I, De March M, Marchesi A, Arcangeletti M, Demitri N, Mazzolini M, Rodriguez A, Magistrato A, Onesti S, Laio A, Torre V Proc Natl Acad Sci U S A. 2015 Jun 22. pii: 201503334. PMID:26100907<ref>PMID:26100907</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4r8c" style="background-color:#fffaf0;"></div>

==See Also==
*[[Potassium channel 3D structures|Potassium channel 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus cereus ATCC 14579]]
[[Category: Large Structures]]
[[Category: De March M]]
[[Category: Napolitano LMR]]
[[Category: Onesti S]]