View source for 8eis


==Cryo-EM structure of octopus sensory receptor CRT1==
<StructureSection load='8eis' size='340' side='right'caption='[[8eis]], [[Resolution|resolution]] 2.62&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8eis]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Octopus_bimaculoides Octopus bimaculoides]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8EIS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8EIS FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.62&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DU0:2-[2-[(1~{S},2~{S},4~{S},5~{R},6~{R},7~{S},8~{R},9~{S},12~{S},13~{R},16~{S})-5,7,9,13-tetramethylspiro[5-oxapentacyclo[10.8.0.0^{2,9}.0^{4,8}.0^{13,18}]icos-18-ene-6,2-oxane]-16-yl]oxyethyl]propane-1,3-diol'>DU0</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</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=8eis FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8eis OCA], [https://pdbe.org/8eis PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8eis RCSB], [https://www.ebi.ac.uk/pdbsum/8eis PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8eis ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0L8FVQ9_OCTBM A0A0L8FVQ9_OCTBM] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The evolution of new traits enables expansion into new ecological and behavioural niches. Nonetheless, demonstrated connections between divergence in protein structure, function and lineage-specific behaviours remain rare. Here we show that both octopus and squid use cephalopod-specific chemotactile receptors (CRs) to sense their respective marine environments, but structural adaptations in these receptors support the sensation of specific molecules suited to distinct physiological roles. We find that squid express ancient CRs that more closely resemble related nicotinic acetylcholine receptors, whereas octopuses exhibit a more recent expansion in CRs consistent with their elaborated 'taste by touch' sensory system. Using a combination of genetic profiling, physiology and behavioural analyses, we identify the founding member of squid CRs that detects soluble bitter molecules that are relevant in ambush predation. We present the cryo-electron microscopy structure of a squid CR and compare this with octopus CRs(1) and nicotinic receptors(2). These analyses demonstrate an evolutionary transition from an ancestral aromatic 'cage' that coordinates soluble neurotransmitters or tastants to a more recent octopus CR hydrophobic binding pocket that traps insoluble molecules to mediate contact-dependent chemosensation. Thus, our study provides a foundation for understanding how adaptation of protein structure drives the diversification of organismal traits and behaviour.

Sensory specializations drive octopus and squid behaviour.,Kang G, Allard CAH, Valencia-Montoya WA, van Giesen L, Kim JJ, Kilian PB, Bai X, Bellono NW, Hibbs RE Nature. 2023 Apr;616(7956):378-383. doi: 10.1038/s41586-023-05808-z. Epub 2023 , Apr 12. PMID:37045917<ref>PMID:37045917</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8eis" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Octopus bimaculoides]]
[[Category: Allard CAH]]
[[Category: Bellono NW]]
[[Category: Hibbs RE]]
[[Category: Kang G]]
[[Category: Kim JJ]]
[[Category: Valencia-Montoya WA]]