4LF3

Inhibitory Mechanism of an Allosteric Antibody Targeting the Glucagon Receptor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.735 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Inhibitory mechanism of an allosteric antibody targeting the glucagon receptor.

Mukund, S.Shang, Y.Clarke, H.J.Madjidi, A.Corn, J.E.Kates, L.Kolumam, G.Chiang, V.Luis, E.Murray, J.Zhang, Y.Hotzel, I.Koth, C.M.Allan, B.B.

(2013) J.Biol.Chem. 288: 36168-36178

  • DOI: 10.1074/jbc.M113.496984
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Elevated glucagon levels and increased hepatic glucagon receptor (GCGR) signaling contribute to hyperglycemia in type 2 diabetes. We have identified a monoclonal antibody that inhibits GCGR, a class B G-protein coupled receptor (GPCR), through a uniq ...

    Elevated glucagon levels and increased hepatic glucagon receptor (GCGR) signaling contribute to hyperglycemia in type 2 diabetes. We have identified a monoclonal antibody that inhibits GCGR, a class B G-protein coupled receptor (GPCR), through a unique allosteric mechanism. Receptor inhibition is mediated by the binding of this antibody to two distinct sites that lie outside of the glucagon binding cleft. One site consists of a patch of residues that are surface-exposed on the face of the extracellular domain (ECD) opposite the ligand-binding cleft, whereas the second binding site consists of residues in the αA helix of the ECD. A docking model suggests that the antibody does not occlude the ligand-binding cleft. We solved the crystal structure of GCGR ECD containing a naturally occurring G40S mutation and found a shift in the register of the αA helix that prevents antibody binding. We also found that alterations in the αA helix impact the normal function of GCGR. We present a model for the allosteric inhibition of GCGR by a monoclonal antibody that may form the basis for the development of allosteric modulators for the treatment of diabetes and other class B GPCR-related diseases.


    Organizational Affiliation

    From the Departments of Structural Biology.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fab heavy chain
A, D
214N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab light chain
B, E
231N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Glucagon receptor
C, F
95Homo sapiensMutation(s): 1 
Gene Names: GCGR
Find proteins for P47871 (Homo sapiens)
Go to Gene View: GCGR
Go to UniProtKB:  P47871
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.735 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.209 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 104.928α = 90.00
b = 62.777β = 106.04
c = 116.432γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-13
    Type: Initial release
  • Version 1.1: 2013-11-27
    Type: Database references
  • Version 1.2: 2014-01-01
    Type: Database references