Jump to main content
Jump to site search

Issue 16, 2019
Previous Article Next Article

Investigation of ECD conformational transition mechanism of GLP-1R by molecular dynamics simulations and Markov state model

Author affiliations

Abstract

As a member of the class B G protein-coupled receptors (GPCRs), the glucagon-like peptide-1 (GLP-1) can regulate the blood glucose level by binding to the glucagon-like peptide-1 receptor (GLP-1R). Since the extracellular domain (ECD) of GLP-1R is considered as one of the binding sites of GLP-1, the open and closed states of ECD play an important role in the binding process of GLP-1. To investigate the transition path of GLP-1R ECD, the crystal structures of GLP-1R in its bound and unbound states (apo-state) are chosen to perform a total of 1.6 μs of molecular dynamics simulations. The simulated results show that the ECD of GLP-1R closes in the GLP-1 bound state and opens in the GLP-1 unbound state. To determine the critical role that GLP-1 played in regulating the open and closed states of the ECD, we applied the independent gradient model (IGM) to the simulation trajectories. We found that the “hand-like” N-terminal of the GLP-1R ECD plays an important role in the GLP-1 binding. In contrast, the apo-state GLP-1R ECD opens and exposes the two ligand binding domains of GLP-1 after 200 ns of simulations. To elucidate the open and closed mechanisms of GLP-1R ECD in the apo-state and GLP-1 bound state, the Markov state model (MSM) is performed on the MD simulation trajectories. Our results provide possible transition pathways from the closed state to open state of the apo-state GLP-1R ECD. Each pathway contains several intermediate states that correspond to different local minima in deep wells. The dynamical relationships and the most possible conversion pathway between two states are detailed through the MSM analysis. Our results profile the conformation transition mechanism of the GLP-1R ECD and will help in hypoglycemic peptide design of GLP-1R.

Graphical abstract: Investigation of ECD conformational transition mechanism of GLP-1R by molecular dynamics simulations and Markov state model

Back to tab navigation

Supplementary files

Publication details

The article was received on 06 Jan 2019, accepted on 25 Mar 2019 and first published on 25 Mar 2019


Article type: Paper
DOI: 10.1039/C9CP00080A
Citation: Phys. Chem. Chem. Phys., 2019,21, 8470-8481

  •   Request permissions

    Investigation of ECD conformational transition mechanism of GLP-1R by molecular dynamics simulations and Markov state model

    J. Zhang, Q. Bai, H. Pérez-Sánchez, S. Shang, X. An and X. Yao, Phys. Chem. Chem. Phys., 2019, 21, 8470
    DOI: 10.1039/C9CP00080A

Search articles by author

Spotlight

Advertisements