9GDU

Trp-cage fortified Tc5b-Exenatide chimera with disulfide bond cyclization (Ex-4-Tc5bCC) at 310K

9GDU の概要

• エントリーDOI: 10.2210/pdb9gdu/pdb
• NMR情報: BMRB: 34945
• 分子名称: Trp-cage fortified Tc5b-Exenatide chimera (Ex-4-Tc5bCC) (1 entity in total)
• 機能のキーワード: exenatide, glp-1r ligand, trp-cage de novo protein, miniprotein, disulfide bond, de novo protein
• 由来する生物種: Heloderma suspectum
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 2820.18

構造登録者

Horvath, D. (登録日: 2024-08-06, 公開日: 2024-09-25, 最終更新日: 2024-10-09)

主引用文献

Horvath, D.,Straner, P.,Taricska, N.,Fazekas, Z.,Menyhard, D.K.,Perczel, A.
Influence of Trp-Cage on the Function and Stability of GLP-1R Agonist Exenatide Derivatives.
J.Med.Chem., 67:16757-16772, 2024

PubMed Abstract: 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.

PubMed: 39254428
DOI: 10.1021/acs.jmedchem.4c01553

実験手法

SOLUTION NMR