6v03

<table><tr><td colspan='2'>[[6v03]] is a 5 chain structure with sequence from [http://en.wikipedia.org/wiki/Dicd3 Dicd3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6V03 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6V03 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=3CN:3-AMINOPROPANE'>3CN</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Dda3937_00520 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=198628 DICD3])</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=6v03 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6v03 OCA], [http://pdbe.org/6v03 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6v03 RCSB], [http://www.ebi.ac.uk/pdbsum/6v03 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6v03 ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The lipid dependence of the nicotinic acetylcholine receptor from the Torpedo electric organ has long been recognized, and one of the most consistent experimental observations is that, when reconstituted in membranes formed by zwitterionic phospholipids alone, exposure to agonist fails to elicit ion-flux activity. More recently, it has been suggested that the bacterial homolog ELIC (Erwinia chrysanthemi ligand-gated ion channel) has a similar lipid sensitivity. As a first step toward the elucidation of the structural basis of this phenomenon, we solved the structures of ELIC embedded in palmitoyl-oleoyl-phosphatidylcholine- (POPC-) only nanodiscs in both the unliganded (4.1-A resolution) and agonist-bound (3.3 A) states using single-particle cryoelectron microscopy. Comparison of the two structural models revealed that the largest differences occur at the level of loop C-at the agonist-binding sites-and the loops at the interface between the extracellular and transmembrane domains (ECD and TMD, respectively). On the other hand, the transmembrane pore is occluded in a remarkably similar manner in both structures. A straightforward interpretation of these findings is that POPC-only membranes frustrate the ECD-TMD coupling in such a way that the "conformational wave" of liganded-receptor gating takes place in the ECD and the interfacial M2-M3 linker but fails to penetrate the membrane and propagate into the TMD. Furthermore, analysis of the structural models and molecular simulations suggested that the higher affinity for agonists characteristic of the open- and desensitized-channel conformations results, at least in part, from the tighter confinement of the ligand to its binding site; this limits the ligand's fluctuations, and thus delays its escape into bulk solvent.

 

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== References ==

[[Category: Dicd3]]

[[Category: Grosman, C]]

[[Category: Kumar, P]]

[[Category: Propylamonium]]