9G0M image
Entry Detail
PDB ID:
9G0M
Keywords:
Title:
Trp-cage fortified Tc5b-Exenatide chimera (Ex4-Tc5bER) at 288K
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-07-08
Release Date:
2024-09-25
Method Details:
Experimental Method:
Conformers Calculated:
20
Conformers Submitted:
10
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Exendin-4
Chain IDs:A
Chain Length:25
Number of Molecules:1
Biological Source:Heloderma suspectum
Ligand Molecules
Primary Citation
Influence of Trp-Cage on the Function and Stability of GLP-1R Agonist Exenatide Derivatives.
J.Med.Chem. 67 16757 16772 (2024)
PMID: 39254428 DOI: 10.1021/acs.jmedchem.4c01553

Abstact

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.

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Primary Citation of related structures