4HJ0

Crystal structure of the human GIPr ECD in complex with Gipg013 Fab at 3-A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.255 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and Pharmacological Characterization of Novel Potent and Selective Monoclonal Antibody Antagonists of Glucose-dependent Insulinotropic Polypeptide Receptor.

Ravn, P.Madhurantakam, C.Kunze, S.Matthews, E.Priest, C.O'Brien, S.Collinson, A.Papworth, M.Fritsch-Fredin, M.Jermutus, L.Benthem, L.Gruetter, M.Jackson, R.H.

(2013) J.Biol.Chem. 288: 19760-19772

  • DOI: 10.1074/jbc.M112.426288

  • PubMed Abstract: 
  • Glucose-dependent insulinotropic polypeptide (GIP) is an endogenous hormonal factor (incretin) that, upon binding to its receptor (GIPr; a class B G-protein-coupled receptor), stimulates insulin secretion by beta cells in the pancreas. There has been ...

    Glucose-dependent insulinotropic polypeptide (GIP) is an endogenous hormonal factor (incretin) that, upon binding to its receptor (GIPr; a class B G-protein-coupled receptor), stimulates insulin secretion by beta cells in the pancreas. There has been a lack of potent inhibitors of the GIPr with prolonged in vivo exposure to support studies on GIP biology. Here we describe the generation of an antagonizing antibody to the GIPr, using phage and ribosome display libraries. Gipg013 is a specific competitive antagonist with equally high potencies to mouse, rat, dog, and human GIP receptors with a Ki of 7 nm for the human GIPr. Gipg013 antagonizes the GIP receptor and inhibits GIP-induced insulin secretion in vitro and in vivo. A crystal structure of Gipg013 Fab in complex with the human GIPr extracellular domain (ECD) shows that the antibody binds through a series of hydrogen bonds from the complementarity-determining regions of Gipg013 Fab to the N-terminal α-helix of GIPr ECD as well as to residues around its highly conserved glucagon receptor subfamily recognition fold. The antibody epitope overlaps with the GIP binding site on the GIPr ECD, ensuring competitive antagonism of the receptor. This well characterized antagonizing antibody to the GIPr will be useful as a tool to further understand the biological roles of GIP.


    Organizational Affiliation

    Department of Antibody Discovery and Protein Engineering, MedImmune, Milstein Building, Granta Park, Cambridge CB21 6GH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Gastric inhibitory polypeptide receptor
A, B
136Homo sapiensMutation(s): 0 
Gene Names: GIPR
Find proteins for P48546 (Homo sapiens)
Go to Gene View: GIPR
Go to UniProtKB:  P48546
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Gipg013 Fab, Antagonizing antibody to the GIP Receptor, Heavy chain
P, C
227N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Gipg013 Fab, Antagonizing antibody to the GIP Receptor, Light chain
Q, D
215N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.255 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 48.266α = 90.00
b = 109.850β = 97.76
c = 105.935γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
MAR345dtbdata collection
PHASERphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-29
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Database references
  • Version 1.2: 2013-07-24
    Type: Database references