3TKD

Crystal structure of the GluA2 ligand-binding domain (S1S2J-L483Y-N754S) in complex with glutamate and cyclothiazide at 1.45 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.148 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Thermodynamics and structural analysis of positive allosteric modulation of the ionotropic glutamate receptor GluA2.

Krintel, C.Frydenvang, K.Olsen, L.Kristensen, M.T.de Barrios, O.Naur, P.Francotte, P.Pirotte, B.Gajhede, M.Kastrup, J.S.

(2012) Biochem J 441: 173-178

  • DOI: 10.1042/BJ20111221
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Positive allosteric modulators of the ionotropic glutamate receptor-2 (GluA2) are promising compounds for the treatment of cognitive disorders, e.g. Alzheimer's disease. These modulators bind within the dimer interface of the LBD (ligand-binding doma ...

    Positive allosteric modulators of the ionotropic glutamate receptor-2 (GluA2) are promising compounds for the treatment of cognitive disorders, e.g. Alzheimer's disease. These modulators bind within the dimer interface of the LBD (ligand-binding domain) and stabilize the agonist-bound conformation slowing receptor desensitization and/or deactivation. In the present study, we employ isothermal titration calorimetry to determine binding affinities and thermodynamic details of binding of modulators of GluA2. A mutant of the LBD of GluA2 (LBD-L483Y-N754S) that forms a stable dimer in solution was used. The potent GluA2 modulator BPAM-97 was used as a reference compound. Evidence that BPAM-97 binds in the same pocket as the well-known GluA2 modulator cyclothiazide was obtained from X-ray structures. The LBD-L483Y-N754S:BPAM-97 complex has a Kd of 5.6 μM (ΔH=-4.9 kcal/mol, -TΔS=-2.3 kcal/mol; where 1 kcal≈4.187 kJ). BPAM-97 was used in a displacement assay to determine a Kd of 0.46 mM (ΔH=-1.2 kcal/mol, -TΔS=-3.3 kcal/mol) for the LBD-L483Y-N754S:IDRA-21 complex. The major structural factors increasing the potency of BPAM-97 over IDRA-21 are the increased van der Waals contacts to, primarily, Met496 in GluA2 imposed by the ethyl substituent of BPAM-97. These results add important information on binding affinities and thermodynamic details, and provide a new tool in the development of drugs against cognitive disorders.


    Related Citations: 
    • Mechanism of glutamate receptor desensitization.
      Sun, Y., Olson, R., Horning, M., Armstrong, N., Mayer, M., Gouaux, E.
      (2002) Nature 417: 245

    Organizational Affiliation

    Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GLUTAMATE RECEPTOR 2
A, B
263Rattus norvegicusMutation(s): 2 
Gene Names: Gria2Glur2
Find proteins for P19491 (Rattus norvegicus)
Go to UniProtKB:  P19491
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYZ
Query on CYZ

Download CCD File 
A, B
CYCLOTHIAZIDE
C14 H16 Cl N3 O4 S2
BOCUKUHCLICSIY-KSCJFIISSA-N
 Ligand Interaction
GLU
Query on GLU

Download CCD File 
A, B
GLUTAMIC ACID
C5 H9 N O4
WHUUTDBJXJRKMK-VKHMYHEASA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
CYZEC50:  13700   nM  BindingDB
CYZEC50:  10000   nM  BindingDB
CYZEC50:  19800   nM  BindingDB
CYZEC50:  1000   nM  BindingDB
CYZEC50:  2000   nM  BindingDB
CYZEC50:  7600   nM  BindingDB
CYZEC50:  100000   nM  BindingDB
CYZEC50:  2240   nM  BindingDB
CYZEC50:  7600   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.148 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.197α = 90
b = 120.865β = 90
c = 47.232γ = 90
Software Package:
Software NamePurpose
PHASESphasing
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2011-12-28
    Changes: Database references
  • Version 1.2: 2017-08-09
    Changes: Data collection, Refinement description, Source and taxonomy