4lf3: Difference between revisions

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-{{STRUCTURE_4lf3|  PDB=4lf3  |  SCENE=  }}
-===Inhibitory Mechanism of an Allosteric Antibody Targeting the Glucagon Receptor===
-{{ABSTRACT_PUBMED_24189067}}
-==Function==
+==Inhibitory Mechanism of an Allosteric Antibody Targeting the Glucagon Receptor==
-[[http://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.
+<StructureSection load='4lf3' size='340' side='right'caption='[[4lf3]], [[Resolution|resolution]] 2.73&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[4lf3]] is a 6 chain structure with sequence from [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=4LF3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LF3 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]] 2.735&#8491;</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=4lf3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4lf3 OCA], [https://pdbe.org/4lf3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4lf3 RCSB], [https://www.ebi.ac.uk/pdbsum/4lf3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4lf3 ProSAT]</span></td></tr>
+</table>
+== Function ==
+[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 ==
+Elevated glucagon levels and increased hepatic glucagon receptor (GCGR) signaling contribute to hyperglycemia in type 2 diabetes. We have identified a monoclonal antibody that inhibits GCGR, a class-B G-protein coupled receptor (GPCR), through a unique allosteric mechanism. Binding of this antibody to two distinct sites that lie outside the glucagon binding cleft mediate receptor inhibition. One site consists of a patch of residues that are surface exposed on the face of the extracellular domain (ECD) opposite the ligand-binding cleft while the second binding site consists of residues in the alphaA helix of the ECD. A docking model suggests that the antibody does not occlude the ligand-binding cleft. We solved the crystal structure of GCGR ECD containing a naturally occurring G40S mutation and found a shift in the register of the alphaA helix that prevents antibody binding. We also found that alterations in the alphaA helix impact the normal function of GCGR. We present a model for the allosteric inhibition of GCGR by a monoclonal antibody that may form the basis for the development of allosteric modulators for the treatment of diabetes and other class-B GPCR-related diseases.
-==About this Structure==
+Inhibitory mechanism of an allosteric antibody targeting the glucagon receptor.,Mukund S, Shang Y, Clarke HJ, Madjidi A, Corn JE, Kates L, Kolumam G, Chiang V, Luis E, Murray J, Zhang Y, Hotzel I, Koth CM, Allan BB J Biol Chem. 2013 Nov 4. PMID:24189067<ref>PMID:24189067</ref>
-[[4lf3]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LF3 OCA].
-==Reference==
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-<ref group="xtra">PMID:024189067</ref><references group="xtra"/><references/>
+</div>
-[[Category: Human]]
+<div class="pdbe-citations 4lf3" style="background-color:#fffaf0;"></div>
-[[Category: Lk3 transgenic mice]]
-[[Category: Mukund, S.]]
+==See Also==
-[[Category: Murray, J M.]]
+*[[Glucagon receptor|Glucagon receptor]]
-[[Category: Fab fragment]]
+== References ==
-[[Category: Gcgr]]
+<references/>
-[[Category: Immune system]]
+__TOC__
+</StructureSection>
+[[Category: Homo sapiens]]
+[[Category: Large Structures]]
+[[Category: Mus musculus]]
+[[Category: Mukund S]]
+[[Category: Murray JM]]