Crystal Structure of Metabotropic Glutamate Receptor Subtype 1 Complexed with Glutamate and Gadolinium Ion

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 

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This is version 1.3 of the entry. See complete history


Structural views of the ligand-binding cores of a metabotropic glutamate receptor complexed with an antagonist and both glutamate and Gd3+.

Tsuchiya, D.Kunishima, N.Kamiya, N.Jingami, H.Morikawa, K.

(2002) Proc Natl Acad Sci U S A 99: 2660-2665

  • DOI: https://doi.org/10.1073/pnas.052708599
  • Primary Citation of Related Structures:  
    1ISR, 1ISS

  • PubMed Abstract: 

    Crystal structures of the extracellular ligand-binding region of the metabotropic glutamate receptor, complexed with an antagonist, (S)-(alpha)-methyl-4-carboxyphenylglycine, and with both glutamate and Gd3+ ion, have been determined by x-ray crystallographic analyses. The structure of the complex with the antagonist is similar to that of the unliganded resting dimer. The antagonist wedges the protomer to maintain an inactive open form. The glutamate/Gd3+ complex is an exact 2-fold symmetric dimer, where each bi-lobed protomer adopts the closed conformation. The surface of the C-terminal domain contains an acidic patch, whose negative charges are alleviated by the metal cation to stabilize the active dimeric structure. The structural comparison between the active and resting dimers suggests that glutamate binding tends to induce domain closing and a small shift of a helix in the dimer interface. Furthermore, an interprotomer contact including the acidic patch inhibited dimer formation by the two open protomers in the active state. These findings provide a structural basis to describe the link between ligand binding and the dimer interface.

  • Organizational Affiliation

    Department of Structural Biology, Biomolecular Engineering Research Institute, 6-2-3 Furuedai, Suita, Osaka 565-0874, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Metabotropic Glutamate Receptor subtype 1490Rattus norvegicusMutation(s): 0 
Gene Names: Grm1Gprc1aMglur1
Find proteins for P23385 (Rattus norvegicus)
Explore P23385 
Go to UniProtKB:  P23385
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23385
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 145.348α = 90
b = 145.348β = 90
c = 76.754γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description