View source for 5ee7


==Crystal structure of the human glucagon receptor (GCGR) in complex with the antagonist MK-0893==
<StructureSection load='5ee7' size='340' side='right'caption='[[5ee7]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5ee7]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_T4 Escherichia virus T4] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5EE7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5EE7 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5MV:3-[[4-[(1~{S})-1-[3-[3,5-BIS(CHLORANYL)PHENYL]-5-(6-METHOXYNAPHTHALEN-2-YL)PYRAZOL-1-YL]ETHYL]PHENYL]CARBONYLAMINO]PROPANOIC+ACID'>5MV</scene>, <scene name='pdbligand=OLA:OLEIC+ACID'>OLA</scene>, <scene name='pdbligand=PE5:3,6,9,12,15,18,21,24-OCTAOXAHEXACOSAN-1-OL'>PE5</scene>, <scene name='pdbligand=TLA:L(+)-TARTARIC+ACID'>TLA</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=5ee7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ee7 OCA], [https://pdbe.org/5ee7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5ee7 RCSB], [https://www.ebi.ac.uk/pdbsum/5ee7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5ee7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ENLYS_BPT4 ENLYS_BPT4] Endolysin with lysozyme activity that degrades host peptidoglycans and participates with the holin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles. Once the holin has permeabilized the host cell membrane, the endolysin can reach the periplasm and break down the peptidoglycan layer.<ref>PMID:22389108</ref> [https://www.uniprot.org/uniprot/GLR_HUMAN GLR_HUMAN] This is a receptor for glucagon which plays a central role in regulating the level of blood glucose by controlling the rate of hepatic glucose production and insulin secretion. The activity of this receptor is mediated by G proteins which activate adenylyl cyclase and also a phosphatidylinositol-calcium second messenger system.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Glucagon is a 29-amino-acid peptide released from the alpha-cells of the islet of Langerhans, which has a key role in glucose homeostasis. Glucagon action is transduced by the class B G-protein-coupled glucagon receptor (GCGR), which is located on liver, kidney, intestinal smooth muscle, brain, adipose tissue, heart and pancreas cells, and this receptor has been considered an important drug target in the treatment of diabetes. Administration of recently identified small-molecule GCGR antagonists in patients with type 2 diabetes results in a substantial reduction of fasting and postprandial glucose concentrations. Although an X-ray structure of the transmembrane domain of the GCGR has previously been solved, the ligand (NNC0640) was not resolved. Here we report the 2.5 A structure of human GCGR in complex with the antagonist MK-0893 (ref. 4), which is found to bind to an allosteric site outside the seven transmembrane (7TM) helical bundle in a position between TM6 and TM7 extending into the lipid bilayer. Mutagenesis of key residues identified in the X-ray structure confirms their role in the binding of MK-0893 to the receptor. The unexpected position of the binding site for MK-0893, which is structurally similar to other GCGR antagonists, suggests that glucagon activation of the receptor is prevented by restriction of the outward helical movement of TM6 required for G-protein coupling. Structural knowledge of class B receptors is limited, with only one other ligand-binding site defined-for the corticotropin-releasing hormone receptor 1 (CRF1R)-which was located deep within the 7TM bundle. We describe a completely novel allosteric binding site for class B receptors, providing an opportunity for structure-based drug design for this receptor class and furthering our understanding of the mechanisms of activation of these receptors.

Extra-helical binding site of a glucagon receptor antagonist.,Jazayeri A, Dore AS, Lamb D, Krishnamurthy H, Southall SM, Baig AH, Bortolato A, Koglin M, Robertson NJ, Errey JC, Andrews SP, Teobald I, Brown AJ, Cooke RM, Weir M, Marshall FH Nature. 2016 Apr 25. doi: 10.1038/nature17414. PMID:27111510<ref>PMID:27111510</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5ee7" style="background-color:#fffaf0;"></div>

==See Also==
*[[Glucagon receptor|Glucagon receptor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia virus T4]]
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Andrews SP]]
[[Category: Baig AH]]
[[Category: Bortolato A]]
[[Category: Brown AJH]]
[[Category: Cooke RM]]
[[Category: Dore AS]]
[[Category: Errey JC]]
[[Category: Jazayeri A]]
[[Category: Koglin M]]
[[Category: Krishnamurthy H]]
[[Category: Lamb D]]
[[Category: Marshall FH]]
[[Category: Robertson NJ]]
[[Category: Southall SM]]
[[Category: Weir M]]