2QS3

Crystal structure of the GluR5 ligand binding core dimer in complex with UBP316 at 1.76 Angstroms resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

ACET is a highly potent and specific kainate receptor antagonist: characterisation and effects on hippocampal mossy fibre function.

Dargan, S.L.Clarke, V.R.Alushin, G.M.Sherwood, J.L.Nistico, R.Bortolotto, Z.A.Ogden, A.M.Bleakman, D.Doherty, A.J.Lodge, D.Mayer, M.L.Fitzjohn, S.M.Jane, D.E.Collingridge, G.L.

(2009) Neuropharmacology 56: 121-130

  • DOI: 10.1016/j.neuropharm.2008.08.016

  • PubMed Abstract: 
  • Kainate receptors (KARs) are involved in both NMDA receptor-independent long-term potentiation (LTP) and synaptic facilitation at mossy fibre synapses in the CA3 region of the hippocampus. However, the identity of the KAR subtypes involved remains co ...

    Kainate receptors (KARs) are involved in both NMDA receptor-independent long-term potentiation (LTP) and synaptic facilitation at mossy fibre synapses in the CA3 region of the hippocampus. However, the identity of the KAR subtypes involved remains controversial. Here we used a highly potent and selective GluK1 (formerly GluR5) antagonist (ACET) to elucidate roles of GluK1-containing KARs in these synaptic processes. We confirmed that ACET is an extremely potent GluK1 antagonist, with a Kb value of 1.4+/-0.2 nM. In contrast, ACET was ineffective at GluK2 (formerly GluR6) receptors at all concentrations tested (up to 100 microM) and had no effect at GluK3 (formerly GluR7) when tested at 1 microM. The X-ray crystal structure of ACET bound to the ligand binding core of GluK1 was similar to the UBP310-GluK1 complex. In the CA1 region of hippocampal slices, ACET was effective at blocking the depression of both fEPSPs and monosynaptically evoked GABAergic transmission induced by ATPA, a GluK1 selective agonist. In the CA3 region of the hippocampus, ACET blocked the induction of NMDA receptor-independent mossy fibre LTP. To directly investigate the role of pre-synaptic GluK1-containing KARs we combined patch-clamp electrophysiology and 2-photon microscopy to image Ca2+ dynamics in individual giant mossy fibre boutons. ACET consistently reduced short-term facilitation of pre-synaptic calcium transients induced by 5 action potentials evoked at 20-25Hz. Taken together our data provide further evidence for a physiological role of GluK1-containing KARs in synaptic facilitation and LTP induction at mossy fibre-CA3 synapses.


    Organizational Affiliation

    MRC Centre for Synaptic Plasticity, University of Bristol, Bristol BS8 1TD, UK. sheila.dargan@bristol.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor, ionotropic kainate 1
A, B
258Rattus norvegicusMutation(s): 1 
Gene Names: Grik1 (Glur5)
Find proteins for P22756 (Rattus norvegicus)
Go to UniProtKB:  P22756
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
UBE
Query on UBE

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Download CCD File 
A, B
3-({3-[(2S)-2-amino-2-carboxyethyl]-5-methyl-2,6-dioxo-3,6-dihydropyrimidin-1(2H)-yl}methyl)-5-phenylthiophene-2-carboxylic acid
C20 H19 N3 O6 S
LCZDCKMQSBGXAH-AWEZNQCLSA-N
 Ligand Interaction
1PE
Query on 1PE

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Download CCD File 
A, B
PENTAETHYLENE GLYCOL
PEG400
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
UBEKd: 1.4 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.76 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.187 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 97.766α = 90.00
b = 97.702β = 90.00
c = 128.604γ = 90.00
Software Package:
Software NamePurpose
SERGUIdata collection
HKL-2000data scaling
HKL-2000data reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-08-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2012-08-22
    Type: Database references
  • Version 1.3: 2017-08-02
    Type: Source and taxonomy