View source for 8jxt


==Histamine-bound H4R/Gi complex==
<StructureSection load='8jxt' size='340' side='right'caption='[[8jxt]], [[Resolution|resolution]] 3.07&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8jxt]] is a 5 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=8JXT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8JXT 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]] 3.07&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HSM:HISTAMINE'>HSM</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=8jxt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8jxt OCA], [https://pdbe.org/8jxt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8jxt RCSB], [https://www.ebi.ac.uk/pdbsum/8jxt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8jxt ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GNAI1_HUMAN GNAI1_HUMAN] Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. The G(i) proteins are involved in hormonal regulation of adenylate cyclase: they inhibit the cyclase in response to beta-adrenergic stimuli. The inactive GDP-bound form prevents the association of RGS14 with centrosomes and is required for the translocation of RGS14 from the cytoplasm to the plasma membrane. May play a role in cell division.<ref>PMID:17635935</ref> <ref>PMID:17264214</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The histamine H(4) receptor (H(4)R) plays key role in immune cell function and is a highly valued target for treating allergic and inflammatory diseases. However, structural information of H(4)R remains elusive. Here, we report four cryo-EM structures of H(4)R/G(i) complexes, with either histamine or synthetic agonists clobenpropit, VUF6884 and clozapine bound. Combined with mutagenesis, ligand binding and functional assays, the structural data reveal a distinct ligand binding mode where D94(3.32) and a pi-pi network determine the orientation of the positively charged group of ligands, while E182(5.46), located at the opposite end of the ligand binding pocket, plays a key role in regulating receptor activity. The structural insight into H(4)R ligand binding allows us to identify mutants at E182(5.46) for which the agonist clobenpropit acts as an inverse agonist and to correctly predict inverse agonism of a closely related analog with nanomolar potency. Together with the findings regarding receptor activation and G(i) engagement, we establish a framework for understanding H(4)R signaling and provide a rational basis for designing novel antihistamines targeting H(4)R.

Structural basis of ligand recognition and design of antihistamines targeting histamine H(4) receptor.,Xia R, Shi S, Xu Z, Vischer HF, Windhorst AD, Qian Y, Duan Y, Liang J, Chen K, Zhang A, Guo C, Leurs R, He Y Nat Commun. 2024 Mar 20;15(1):2493. doi: 10.1038/s41467-024-46840-5. PMID:38509098<ref>PMID:38509098</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8jxt" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: He Y]]
[[Category: Xia R]]