6CNA image
Entry Detail
PDB ID:
6CNA
EMDB ID:
Title:
GluN1-GluN2B NMDA receptors with exon 5
Biological Source:
PDB Version:
Deposition Date:
2018-03-07
Release Date:
2018-10-03
Method Details:
Experimental Method:
Resolution:
4.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glutamate receptor ionotropic, NMDA 1
Chain IDs:A, C
Chain Length:838
Number of Molecules:2
Biological Source:Rattus norvegicus
Polymer Type:polypeptide(L)
Description:Glutamate receptor ionotropic, NMDA 2B
Chain IDs:B, D
Chain Length:812
Number of Molecules:2
Biological Source:Rattus norvegicus
Ligand Molecules
Primary Citation
Structural Mechanism of Functional Modulation by Gene Splicing in NMDA Receptors.
Neuron 98 521 529.e3 (2018)
PMID: 29656875 DOI: 10.1016/j.neuron.2018.03.034

Abstact

Alternative gene splicing gives rise to N-methyl-D-aspartate (NMDA) receptor ion channels with defined functional properties and unique contributions to calcium signaling in a given chemical environment in the mammalian brain. Splice variants possessing the exon-5-encoded motif at the amino-terminal domain (ATD) of the GluN1 subunit are known to display robustly altered deactivation rates and pH sensitivity, but the underlying mechanism for this functional modification is largely unknown. Here, we show through cryoelectron microscopy (cryo-EM) that the presence of the exon 5 motif in GluN1 alters the local architecture of heterotetrameric GluN1-GluN2 NMDA receptors and creates contacts with the ligand-binding domains (LBDs) of the GluN1 and GluN2 subunits, which are absent in NMDA receptors lacking the exon 5 motif. The unique interactions established by the exon 5 motif are essential to the stability of the ATD/LBD and LBD/LBD interfaces that are critically involved in controlling proton sensitivity and deactivation.

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Primary Citation of related structures