5OTX

Extracellular domain of GLP-1 receptor in complex with GLP-1 variant Ala8Cys/Thr11Cys


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

alpha-Helix or beta-Turn? An Investigation into N-Terminally Constrained Analogues of Glucagon-like Peptide 1 (GLP-1) and Exendin-4.

Oddo, A.Mortensen, S.Thogersen, H.De Maria, L.Hennen, S.McGuire, J.N.Kofoed, J.Linderoth, L.Reedtz-Runge, S.

(2018) Biochemistry 57: 4148-4154

  • DOI: 10.1021/acs.biochem.8b00105
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Peptide agonists acting on the glucagon-like peptide 1 receptor (GLP-1R) promote glucose-dependent insulin release and therefore represent important therapeutic agents for type 2 diabetes (T2D). Previous data indicated that an N-terminal type II β-tu ...

    Peptide agonists acting on the glucagon-like peptide 1 receptor (GLP-1R) promote glucose-dependent insulin release and therefore represent important therapeutic agents for type 2 diabetes (T2D). Previous data indicated that an N-terminal type II β-turn motif might be an important feature for agonists acting on the GLP-1R. In contrast, recent publications reporting the structure of the full-length GLP-1R have shown the N-terminus of receptor-bound agonists in an α-helical conformation. To reconcile these conflicting results, we prepared N-terminally constrained analogues of glucagon-like peptide 1 (GLP-1) and exendin-4 and evaluated their receptor affinity and functionality in vitro; we then examined their crystal structures in complex with the extracellular domain of the GLP-1R and used molecular modeling and molecular dynamics simulations for further investigations. We report that the peptides' N-termini in all determined crystal structures adopted a type II β-turn conformation, but in vitro potency varied several thousand-fold across the series. Potency correlated better with α-helicity in our computational model, although we have found that the energy barrier between the two mentioned conformations is low in our most potent analogues and the flexibility of the N-terminus is highlighted by the dynamics simulations.


    Organizational Affiliation

    Global Research , Novo Nordisk A/S , Novo Nordisk Park , 2760 Måløv , Denmark.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glucagon-like peptide 1 receptor
A, C
116Homo sapiensMutation(s): 0 
Gene Names: GLP1R
Find proteins for P43220 (Homo sapiens)
Go to Gene View: GLP1R
Go to UniProtKB:  P43220
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Glucagon
B, D
31Homo sapiensMutation(s): 2 
Gene Names: GCG
Find proteins for P01275 (Homo sapiens)
Go to Gene View: GCG
Go to UniProtKB:  P01275
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 37.870α = 90.00
b = 83.590β = 95.19
c = 42.830γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXrefinement
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2017-08-22 
  • Released Date: 2018-07-04 
  • Deposition Author(s): Mortensen, S.

Revision History 

  • Version 1.0: 2018-07-04
    Type: Initial release
  • Version 1.1: 2018-07-25
    Type: Data collection, Database references