2V3T image
Entry Detail
PDB ID:
2V3T
Keywords:
Title:
Structure of the ligand-binding core of the ionotropic glutamate receptor-like GluRdelta2 in the apo form
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2007-06-22
Release Date:
2007-08-07
Method Details:
Experimental Method:
Resolution:
2.75 Å
R-Value Free:
0.28
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
I 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:GLUTAMATE RECEPTOR DELTA-2 SUBUNIT SYNONYM GLURDELTA2, GLUR DELTA-2
Chain IDs:A, B
Chain Length:265
Number of Molecules:2
Biological Source:RATTUS NORVEGICUS
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Ligand Molecules
Primary Citation
Ionotropic Glutamate-Like Receptor {Delta}2 Binds D-Serine and Glycine.
Proc.Natl.Acad.Sci.USA 104 14116 ? (2007)
PMID: 17715062 DOI: 10.1073/PNAS.0703718104

Abstact

The orphan glutamate-like receptor GluRdelta2 is predominantly expressed in Purkinje cells of the central nervous system. The classification of GluRdelta2 to the ionotropic glutamate receptor family is based on sequence similarities, because GluRdelta2 does not form functional homomeric glutamate-gated ion channels in transfected cells. Studies in GluRdelta2(-/-) knockout mice as well as in mice with naturally occurring mutations in the GluRdelta2 gene have demonstrated an essential role of GluRdelta2 in cerebellar long-term depression, motor learning, motor coordination, and synaptogenesis. However, the lack of a known agonist has hampered investigations on the function of GluRdelta2. In this study, the ligand-binding core of GluRdelta2 (GluRdelta2-S1S2) was found to bind neutral amino acids such as D-serine and glycine, as demonstrated by isothermal titration calorimetry. Direct evidence for binding of D-serine and structural rearrangements in the binding cleft of GluRdelta2-S1S2 is provided by x-ray structures of GluRdelta2-S1S2 in its apo form and in complex with D-serine. Functionally, D-serine and glycine were shown to inactivate spontaneous ion-channel conductance in GluRdelta2 containing the lurcher mutation (EC(50) values, 182 and 507 microM, respectively). These data demonstrate that the GluRdelta2 ligand-binding core is capable of binding ligands and that cleft closure of the ligand-binding core can induce conformational changes that alter ion permeation.

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Primary Citation of related structures