View source for 6lfm


==Cryo-EM structure of a class A GPCR==
<StructureSection load='6lfm' size='340' side='right'caption='[[6lfm]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6lfm]] is a 7 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6LFM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6LFM 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]] 3.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CLR:CHOLESTEROL'>CLR</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=6lfm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6lfm OCA], [https://pdbe.org/6lfm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6lfm RCSB], [https://www.ebi.ac.uk/pdbsum/6lfm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6lfm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GBG2_HUMAN GBG2_HUMAN] Guanine nucleotide-binding proteins (G proteins) are involved as a modulator or transducer in various transmembrane signaling systems. The beta and gamma chains are required for the GTPase activity, for replacement of GDP by GTP, and for G protein-effector interaction (By similarity).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Chemokines and their receptors mediate cell migration, which influences multiple fundamental biological processes and disease conditions such as inflammation and cancer(1). Although ample effort has been invested into the structural investigation of the chemokine receptors and receptor-chemokine recognition(2-4), less is known about endogenous chemokine-induced receptor activation and G-protein coupling. Here we present the cryo-electron microscopy structures of interleukin-8 (IL-8, also known as CXCL8)-activated human CXC chemokine receptor 2 (CXCR2) in complex with Gi protein, along with a crystal structure of CXCR2 bound to a designed allosteric antagonist. Our results reveal a unique shallow mode of binding between CXCL8 and CXCR2, and also show the interactions between CXCR2 and Gi protein. Further structural analysis of the inactive and active states of CXCR2 reveals a distinct activation process and the competitive small-molecule antagonism of chemokine receptors. In addition, our results provide insights into how a G-protein-coupled receptor is activated by an endogenous protein molecule, which will assist in the rational development of therapeutics that target the chemokine system for better pharmacological profiles.

Structural basis of CXC chemokine receptor 2 activation and signalling.,Liu K, Wu L, Yuan S, Wu M, Xu Y, Sun Q, Li S, Zhao S, Hua T, Liu ZJ Nature. 2020 Jul 1. pii: 10.1038/s41586-020-2492-5. doi:, 10.1038/s41586-020-2492-5. PMID:32610344<ref>PMID:32610344</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6lfm" style="background-color:#fffaf0;"></div>

==See Also==
*[[GTP-binding protein 3D structures|GTP-binding protein 3D structures]]
*[[Interleukin 3D structures|Interleukin 3D structures]]
*[[Transducin 3D structures|Transducin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Hua T]]
[[Category: Liu KW]]
[[Category: Liu ZJ]]
[[Category: Wu LJ]]