View source for 9ge2


==Structure of GPR55 in complex with G13 and synthetic agonist ML184==
<StructureSection load='9ge2' size='340' side='right'caption='[[9ge2]], [[Resolution|resolution]] 2.51&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9ge2]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Aequorea_victoria Aequorea victoria], [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9GE2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9GE2 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]] 2.51&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1IKH:3-[4-(2,3-dimethylphenyl)piperazin-1-yl]carbonyl-~{N},~{N}-dimethyl-4-pyrrolidin-1-yl-benzenesulfonamide'>A1IKH</scene>, <scene name='pdbligand=CLR:CHOLESTEROL'>CLR</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=9ge2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9ge2 OCA], [https://pdbe.org/9ge2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9ge2 RCSB], [https://www.ebi.ac.uk/pdbsum/9ge2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9ge2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GNA13_HUMAN GNA13_HUMAN] Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems (PubMed:15240885, PubMed:16705036, PubMed:16787920, PubMed:27084452). Activates effector molecule RhoA by binding and activating RhoGEFs (ARHGEF1/p115RhoGEF, ARHGEF11/PDZ-RhoGEF and ARHGEF12/LARG) (PubMed:12515866, PubMed:15240885). GNA13-dependent Rho signaling subsequently regulates transcription factor AP-1 (activating protein-1) (By similarity). Promotes tumor cell invasion and metastasis by activating RhoA/ROCK signaling pathway (PubMed:16705036, PubMed:16787920, PubMed:27084452). Inhibits CDH1-mediated cell adhesion in process independent from Rho activation (PubMed:11976333).[UniProtKB:P27601]<ref>PMID:11976333</ref> <ref>PMID:12515866</ref> <ref>PMID:15240885</ref> <ref>PMID:16705036</ref> <ref>PMID:16787920</ref> <ref>PMID:27084452</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
GPR55 is an orphan G protein-coupled receptor (GPCR) and represents a promising drug target for cancer, inflammation, and metabolic diseases. The endogenous activation of lipid GPCRs can be solely mediated by membrane components and different lipids have been proposed as endogenous activators of GPR55, such as cannabinoids and lysophosphatidylinositols. Here, we determine high-resolution cryo-electron microscopy structures of the activated GPR55 in complex with heterotrimeric G(13) and two structurally diverse ligands: the putative endogenous agonist 1-palmitoyl-2-lysophosphatidylinositol (LPI) and the synthetic agonist ML184. These results reveal insights into ligand recognition at GPR55, G protein coupling and receptor activation. Notably, an orthosteric binding site opening towards the membrane is observed in both structures, enabling direct interaction of the agonists with membrane lipids. The structural observations are supported by mutagenesis and functional experiments employing G protein dissociation assays. These findings will be of importance for the structure-based development of drugs targeting GPR55.

Structural basis for lipid-mediated activation of G protein-coupled receptor GPR55.,Claff T, Ebenhoch R, Kley JT, Magarkar A, Nar H, Weichert D Nat Commun. 2025 Feb 25;16(1):1973. doi: 10.1038/s41467-025-57204-y. PMID:40000629<ref>PMID:40000629</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9ge2" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Aequorea victoria]]
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Claff T]]
[[Category: Ebenhoch R]]
[[Category: Weichert D]]