View source for 9ge9


==Trp-cage fortified Tc5b-Exenatide chimera (Ex-4-Tc5bQR) at 277K==
<StructureSection load='9ge9' size='340' side='right'caption='[[9ge9]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9ge9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Heloderma_suspectum Heloderma suspectum]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9GE9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9GE9 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 10 models</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=9ge9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9ge9 OCA], [https://pdbe.org/9ge9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9ge9 RCSB], [https://www.ebi.ac.uk/pdbsum/9ge9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9ge9 ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Exenatide (Ex4), a GLP-1 incretin mimetic polypeptide, is an effective therapeutic agent against diabetes and obesity. We highlight the indirect role of Ex4's structure-stabilizing Trp-cage (Tc) motif in governing GLP-1 receptor (GLP-1R) signal transduction. We use various Ex4 derivatives to explore how Tc compactness influences thermal stability, aggregation, enhancement of insulin secretion, and GLP-1R binding. We found that Ex4 variants decorated with fortified Tc motifs exhibit increased resistance to unfolding and aggregation but show an inverse relationship between the bioactivity and stability. Molecular dynamics simulations coupled with a rigid-body segmentation protocol to analyze dynamic interconnectedness revealed that the constrained Tc motifs remain intact within the receptor-ligand complexes but interfere with one of the major stabilizing contacts and recognition loci on the extracellular side of GLP-1R, dislodging the N-terminal activating region of the hormone mimetics, and restrict the free movement of TM6, the main signal transduction device of GLP-1R.

Influence of Trp-Cage on the Function and Stability of GLP-1R Agonist Exenatide Derivatives.,Horvath D, Straner P, Taricska N, Fazekas Z, Menyhard DK, Perczel A J Med Chem. 2024 Sep 10. doi: 10.1021/acs.jmedchem.4c01553. PMID:39254428<ref>PMID:39254428</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9ge9" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Heloderma suspectum]]
[[Category: Large Structures]]
[[Category: Horvath D]]