4F11

Crystal structure of the extracellular domain of human GABA(B) receptor GBR2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure and functional interaction of the extracellular domain of human GABA(B) receptor GBR2.

Geng, Y.Xiong, D.Mosyak, L.Malito, D.L.Kniazeff, J.Chen, Y.Burmakina, S.Quick, M.Bush, M.Javitch, J.A.Pin, J.P.Fan, Q.R.

(2012) Nat Neurosci 15: 970-978

  • DOI: 10.1038/nn.3133
  • Primary Citation of Related Structures:  
    4F11, 4F12

  • PubMed Abstract: 
  • Inhibitory neurotransmission is mediated primarily by GABA. The metabotropic GABA(B) receptor is a G protein-coupled receptor central to mammalian brain function. Malfunction of GABA(B) receptor has been implicated in several neurological disorders. ...

    Inhibitory neurotransmission is mediated primarily by GABA. The metabotropic GABA(B) receptor is a G protein-coupled receptor central to mammalian brain function. Malfunction of GABA(B) receptor has been implicated in several neurological disorders. GABA(B) receptor functions as a heterodimeric assembly of GBR1 and GBR2 subunits, where GBR1 is responsible for ligand-binding and GBR2 is responsible for G protein coupling. Here we demonstrate that the GBR2 ectodomain directly interacts with the GBR1 ectodomain to increase agonist affinity by selectively stabilizing the agonist-bound conformation of GBR1. We present the crystal structure of the GBR2 ectodomain, which reveals a polar heterodimeric interface. We also identify specific heterodimer contacts from both subunits, and GBR1 residues involved in ligand recognition. Lastly, our structural and functional data indicate that the GBR2 ectodomain adopts a constitutively open conformation, suggesting a structural asymmetry in the active state of GABA(B) receptor that is unique to the GABAergic system.


    Organizational Affiliation

    Department of Pharmacology, Columbia University, New York, New York, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid type B receptor subunit 2A433Homo sapiensMutation(s): 0 
Gene Names: GABBR2GPR51GPRC3B
Find proteins for O75899 (Homo sapiens)
Explore O75899 
Go to UniProtKB:  O75899
NIH Common Fund Data Resources
PHAROS  O75899
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 153.212α = 90
b = 92.716β = 102.75
c = 48.558γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
SHELXSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-06
    Type: Initial release
  • Version 1.1: 2012-08-15
    Changes: Database references