3RNN

Crystal Structure of iGluR2 Ligand Binding Domain with Symmetric Sulfonamide Containing Potentiator


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural and functional analysis of two new positive allosteric modulators of GluA2 desensitization and deactivation.

Timm, D.E.Benveniste, M.Weeks, A.M.Nisenbaum, E.S.Partin, K.M.

(2011) Mol Pharmacol 80: 267-280

  • DOI: 10.1124/mol.110.070243
  • Primary Citation of Related Structures:  
    3RNN, 3RN8

  • PubMed Abstract: 
  • At the dimer interface of the extracellular ligand-binding domain of α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptors a hydrophilic pocket is formed that is known to interact with two classes of positive allosteric modulators, represented by cyclothiazide and the ampakine 2H,3H,6aH-pyrrolidino(2,1-3',2')1,3-oxazino(6',5'-5,4)benzo(e)1,4-dioxan-10-one (CX614) ...

    At the dimer interface of the extracellular ligand-binding domain of α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptors a hydrophilic pocket is formed that is known to interact with two classes of positive allosteric modulators, represented by cyclothiazide and the ampakine 2H,3H,6aH-pyrrolidino(2,1-3',2')1,3-oxazino(6',5'-5,4)benzo(e)1,4-dioxan-10-one (CX614). Here, we present structural and functional data on two new positive allosteric modulators of AMPA receptors, phenyl-1,4-bis-alkylsulfonamide (CMPDA) and phenyl-1,4-bis-carboxythiophene (CMPDB). Crystallographic data show that these compounds bind within the modulator-binding pocket and that substituents of each compound overlap with distinct moieties of cyclothiazide and CX614. The goals of the present study were to determine 1) the degree of modulation by CMPDA and CMPDB of AMPA receptor deactivation and desensitization; 2) whether these compounds are splice isoform-selective; and 3) whether predictions of mechanism of action could be inferred by comparing molecular interactions between the ligand-binding domain and each compound with those of cyclothiazide and CX614. CMPDB was found to be more isoform-selective than would be predicted from initial binding assays. It is noteworthy that these new compounds are both more potent and more effective and may be more clinically relevant than the AMPA receptor modulators described previously.


    Organizational Affiliation

    Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523-1617, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutamate receptor 2 ABC292Homo sapiensMutation(s): 0 
Gene Names: GRIA2GLUR2
Find proteins for P42262 (Homo sapiens)
Explore P42262 
Go to UniProtKB:  P42262
NIH Common Fund Data Resources
PHAROS:  P42262
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.368α = 90
b = 163.856β = 90
c = 47.391γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CNSrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2011-04-22 
  • Released Date: 2011-05-25 
  • Deposition Author(s): Timm, D.E.

Revision History  (Full details and data files)

  • Version 1.0: 2011-05-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-11-16
    Changes: Database references
  • Version 1.3: 2017-08-23
    Changes: Refinement description, Source and taxonomy
  • Version 1.4: 2019-07-17
    Changes: Data collection, Refinement description