6O9H

Mouse ECD with Fab1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Molecular mechanism of an antagonistic antibody against glucose-dependent insulinotropic polypeptide receptor.

Min, X.Yie, J.Wang, J.Chung, B.C.Huang, C.S.Xu, H.Yang, J.Deng, L.Lin, J.Chen, Q.Abbott, C.M.Gundel, C.Thibault, S.A.Meng, T.Bates, D.L.Lloyd, D.J.Veniant, M.M.Wang, Z.

(2020) MAbs 12: 1710047-1710047

  • DOI: 10.1080/19420862.2019.1710047
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Glucose-dependent insulinotropic polypeptide (GIP) is an incretin hormone involved in regulating glucose and lipid metabolism. GIP receptor (GIPR) antagonism is believed to offer therapeutic potential for various metabolic diseases. Pharmacological intervention of GIPR, however, has limited success due to lack of effective antagonistic reagents ...

    Glucose-dependent insulinotropic polypeptide (GIP) is an incretin hormone involved in regulating glucose and lipid metabolism. GIP receptor (GIPR) antagonism is believed to offer therapeutic potential for various metabolic diseases. Pharmacological intervention of GIPR, however, has limited success due to lack of effective antagonistic reagents. Previously we reported the discovery of two mouse anti-murine GIPR monoclonal antibodies (mAbs) with distinctive properties in rodent models. Here, we report the detailed structural and biochemical characterization of these two antibodies, mAb1 and mAb2. In vitro and in vivo characterizations demonstrated mAb2 is a full GIPR antagonistic antibody and mAb1 is a non-neutralizing GIPR binder. To understand the molecular basis of these two antibodies, we determined the co-crystal structures of GIPR extracellular domain in complex with mAb1 and with mAb2 at resolutions of 2.1 and 2.6 Å, respectively. While the non-neutralizing mAb1 binds to GIPR without competing with the ligand peptide, mAb2 not only partially occludes the ligand peptide binding, but also recognizes the GIPR C-terminal stalk region in a helical conformation that acts as a molecular mimic of the ligand peptide and locks GIPR in a novel auto-inhibited state. Furthermore, administration of mAb2 in diet-induced obesity mice for 7 weeks leads to both reduction in body weight gain and improvement of metabolic profiles. In contrast, mAb1 has no effect on body weight or other metabolic improvement. Together, our studies reveal the unique molecular mechanism of action underlying the superior antagonistic activity of mAb2 and signify the promising therapeutic potential of effective GIPR antagonism for the treatment of metabolic disorders.


    Organizational Affiliation

    Departments of Therapeutics Discovery, Amgen Research, South San Francisco, CA, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heavy chainA, H225Homo sapiensMutation(s): 0 
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Light chainB, L220Homo sapiensMutation(s): 0 
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Gastric inhibitory polypeptide receptorC, D137Mus musculusMutation(s): 0 
Gene Names: Gipr
Find proteins for Q0P543 (Mus musculus)
Explore Q0P543 
Go to UniProtKB:  Q0P543
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download CCD File 
A, D
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.078α = 90
b = 48.974β = 101.08
c = 150.908γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2019-03-13 
  • Released Date: 2020-01-22 
  • Deposition Author(s): Min, X., Wang, Z.

Revision History 

  • Version 1.0: 2020-01-22
    Type: Initial release
  • Version 1.1: 2020-04-01
    Changes: Database references, Source and taxonomy, Structure summary