9J5F

Solution structure of disulfide-directed multicyclic peptides with n-terminal helix

9J5F の概要

• エントリーDOI: 10.2210/pdb9j5f/pdb
• 分子名称: m1-2 (1 entity in total)
• 機能のキーワード: disulfide-directed multicyclic peptides, unknown function
• 由来する生物種: synthetic construct
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 3558.16

構造登録者

Fan, S.H.,Wu, C.L. (登録日: 2024-08-12, 公開日: 2025-02-19, 最終更新日: 2025-02-26)

主引用文献

Fan, S.,Li, J.,Zhuang, J.,Zhou, Q.,Mai, Y.,Lin, B.,Wang, M.W.,Wu, C.
Disulfide-Directed Multicyclic Peptides with N-Terminally Extendable alpha-Helices for Recognition and Activation of G Protein-Coupled Receptors.
J.Am.Chem.Soc., 147:4821-4832, 2025

PubMed Abstract: Many peptide hormones adopt long α-helical structures upon interacting with their cognate receptors but often exhibit flexible conformations when unbound. Strategies that can stabilize long α-helices without disrupting their binding to receptors are still lacking, which hinders progress in their biological applications and drug development. Here, we present an approach that combines rational design with library screening to create and identify a unique disulfide-directed multicyclic peptide (DDMP) scaffold, which could effectively stabilize N-terminally extendable α-helices while displaying exceptional efficiency in disulfide pairing and oxidative folding. This DDMP scaffold was then utilized for stabilizing the α-helical structure of glucagon-like peptide-1 (GLP-1), resulting in a potent GLP-1 receptor (GLP-1R) agonist with a significantly improved α-helicity and proteolytic stability. By incorporating external α-helices into the DDMP scaffold, we can effectively preserve the native N-terminal α-helical structures while allowing for extensive evolution of the C-terminal disulfide-rich domain for enhancing target binding, as demonstrated by the generation of the DDMP-stabilized GLP-1 (g1:Ox). The cryo-electron microscopy structure of the g1:Ox-GLP-1R in complex with heterotrimeric G reveals the molecular basis for the potent binding between g1:Ox and GLP-1R. Specifically, the DDMP moiety establishes additional interactions with the extracellular domain of GLP-1R, which are absent in the case of GLP-1. Thus, this work offers a novel and effective approach for engineering therapeutic peptides and other peptide α-helices, ensuring that both the N- and C-terminal regions remain essential for target recognition and activation.

PubMed: 39688263
DOI: 10.1021/jacs.4c12808

実験手法

SOLUTION NMR