4N07

Crystal structure of the GluA2 ligand-binding domain (S1S2J-L483Y-N754S) in complex with glutamate and BPAM-344 at 1.87 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Synthesis, pharmacological and structural characterization, and thermodynamic aspects of GluA2-positive allosteric modulators with a 3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide scaffold.

Nrholm, A.B.Francotte, P.Olsen, L.Krintel, C.Frydenvang, K.Goffin, E.Challal, S.Danober, L.Botez-Pop, I.Lestage, P.Pirotte, B.Kastrup, J.S.

(2013) J.Med.Chem. 56: 8736-8745

  • DOI: 10.1021/jm4012092
  • Also Cited By: 4U4S, 5ELV, 5OEW, 5BUU, 4U4X

  • PubMed Abstract: 
  • Positive allosteric modulators of ionotropic glutamate receptors are potential compounds for treatment of cognitive disorders, e.g., Alzheimer's disease. The modulators bind within the dimer interface of the ligand-binding domain (LBD) and stabilize ...

    Positive allosteric modulators of ionotropic glutamate receptors are potential compounds for treatment of cognitive disorders, e.g., Alzheimer's disease. The modulators bind within the dimer interface of the ligand-binding domain (LBD) and stabilize the agonist-bound conformation, thereby slowing receptor desensitization and/or deactivation. Here we describe the synthesis and pharmacological testing at GluA2 of a new generation of 3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxides. The most potent modulator 3 in complex with GluA2-LBD-L483Y-N754S was subjected to structural analysis by X-ray crystallography, and the thermodynamics of binding was studied by isothermal titration calorimetry. Compound 3 binds to GluA2-LBD-L483Y-N754S with a Kd of 0.35 μM (ΔH = -7.5 kcal/mol and -TΔS = -1.3 kcal/mol). This is the first time that submicromolar binding affinity has been achieved for this type of positive allosteric modulator. The major structural factor increasing the binding affinity of 3 seems to be interactions between the cyclopropyl group of 3 and the backbone of Phe495 and Met496.


    Organizational Affiliation

    Department of Drug Design and Pharmacology, Faculty of Health and Medical 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, C
263Rattus norvegicusMutation(s): 2 
Gene Names: Gria2 (Glur2)
Find proteins for P19491 (Rattus norvegicus)
Go to UniProtKB:  P19491
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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A, B, C
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
2J9
Query on 2J9

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A, B, C
4-cyclopropyl-7-fluoro-3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide
C10 H11 F N2 O2 S
FLTMTBPCYAZIKM-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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A, B, C
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
GLU
Query on GLU

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A, B, C
GLUTAMIC ACID
C5 H9 N O4
WHUUTDBJXJRKMK-VKHMYHEASA-N
 Ligand Interaction
CAC
Query on CAC

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Download CCD File 
A
CACODYLATE ION
dimethylarsinate
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
2J9Kd: 350 nM BINDINGMOAD
2J9Kd: 350 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.175 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 113.904α = 90.00
b = 164.034β = 90.00
c = 47.284γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-20
    Type: Initial release
  • Version 1.1: 2014-03-19
    Type: Database references
  • Version 1.2: 2017-08-09
    Type: Data collection, Refinement description, Source and taxonomy