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: 3.00 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.260 

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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
  • Primary Citation of Related Structures:  
    4HJ0

  • 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 a lack of potent inhibitors of the GIPr with prolonged in vivo exposure to support studies on GIP biology ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gastric inhibitory polypeptide receptorA, B136Homo sapiensMutation(s): 0 
Gene Names: GIPR
UniProt & NIH Common Fund Data Resources
Find proteins for P48546 (Homo sapiens)
Explore P48546 
Go to UniProtKB:  P48546
PHAROS:  P48546
Entity Groups  
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UniProt GroupP48546
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Gipg013 Fab, Antagonizing antibody to the GIP Receptor, Heavy chainF [auth C],
C [auth P]
227Homo sapiensMutation(s): 0 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Gipg013 Fab, Antagonizing antibody to the GIP Receptor, Light chainE [auth D],
D [auth Q]
215Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.260 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.266α = 90
b = 109.85β = 97.76
c = 105.935γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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