4MQE

Crystal structure of the extracellular domain of human GABA(B) receptor in the apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Structural mechanism of ligand activation in human GABA(B) receptor.

Geng, Y.Bush, M.Mosyak, L.Wang, F.Fan, Q.R.

(2013) Nature 504: 254-259

  • DOI: 10.1038/nature12725
  • Primary Citation of Related Structures:  
    4MQE, 4MQF, 4MR7, 4MR8, 4MR9, 4MRM, 4MS1, 4MS3, 4MS4

  • PubMed Abstract: 
  • Human GABA(B) (γ-aminobutyric acid class B) receptor is a G-protein-coupled receptor central to inhibitory neurotransmission in the brain. It functions as an obligatory heterodimer of the subunits GBR1 and GBR2. Here we present the crystal structures of a heterodimeric complex between the extracellular domains of GBR1 and GBR2 in the apo, agonist-bound and antagonist-bound forms ...

    Human GABA(B) (γ-aminobutyric acid class B) receptor is a G-protein-coupled receptor central to inhibitory neurotransmission in the brain. It functions as an obligatory heterodimer of the subunits GBR1 and GBR2. Here we present the crystal structures of a heterodimeric complex between the extracellular domains of GBR1 and GBR2 in the apo, agonist-bound and antagonist-bound forms. The apo and antagonist-bound structures represent the resting state of the receptor; the agonist-bound complex corresponds to the active state. Both subunits adopt an open conformation at rest, and only GBR1 closes on agonist-induced receptor activation. The agonists and antagonists are anchored in the interdomain crevice of GBR1 by an overlapping set of residues. An antagonist confines GBR1 to the open conformation of the inactive state, whereas an agonist induces its domain closure for activation. Our data reveal a unique activation mechanism for GABA(B) receptor that involves the formation of a novel heterodimer interface between subunits.


    Organizational Affiliation

    1] Department of Pharmacology, Columbia University, New York, New York 10032, USA [2] Department of Pathology & Cell Biology, Columbia University, New York, New York 10032, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid type B receptor subunit 1A420Homo sapiensMutation(s): 0 
Gene Names: GABBR1GPRC3A
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UBS5 (Homo sapiens)
Explore Q9UBS5 
Go to UniProtKB:  Q9UBS5
PHAROS:  Q9UBS5
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid type B receptor subunit 2B433Homo sapiensMutation(s): 0 
Gene Names: GABBR2GPR51GPRC3B
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O75899 (Homo sapiens)
Explore O75899 
Go to UniProtKB:  O75899
PHAROS:  O75899
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranoseC6N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G64181RO
GlyCosmos:  G64181RO
GlyGen:  G64181RO
Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranoseD4N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G47477HI
GlyCosmos:  G47477HI
GlyGen:  G47477HI
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG

Download Ideal Coordinates CCD File 
E [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.08α = 90
b = 113.08β = 97.58
c = 73.11γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
XDSdata scaling
XDSdata reduction
PHASERphasing
BUSTERrefinement

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-11
    Type: Initial release
  • Version 1.1: 2013-12-18
    Changes: Database references
  • Version 1.2: 2014-02-05
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary