7sad

From Proteopedia

Memantine-bound GluN1a-GluN2B NMDA receptors

Structural highlights

7sad is a 4 chain structure with sequence from Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3.96Å
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NMDE2_RAT NMDA receptor subtype of glutamate-gated ion channels with high calcium permeability and voltage-dependent sensitivity to magnesium. Mediated by glycine. In concert with DAPK1 at extrasynaptic sites, acts as a central mediator for stroke damage. Its phosphorylation at Ser-1303 by DAPK1 enhances synaptic NMDA receptor channel activity inducing injurious Ca2+ influx through them, resulting in an irreversible neuronal death (By similarity).

Publication Abstract from PubMed

Excitatory signaling mediated by N-methyl-D-aspartate receptor (NMDAR) is critical for brain development and function, as well as for neurological diseases and disorders. Channel blockers of NMDARs are of medical interest owing to their potential for treating depression, Alzheimer's disease, and epilepsy. However, precise mechanisms underlying binding and channel blockade have remained limited owing to challenges in obtaining high-resolution structures at the binding site within the transmembrane domains. Here, we monitor the binding of three clinically important channel blockers: phencyclidine, ketamine, and memantine in GluN1-2B NMDARs at local resolutions of 2.5-3.5 A around the binding site using single-particle electron cryo-microscopy, molecular dynamics simulations, and electrophysiology. The channel blockers form different extents of interactions with the pore-lining residues, which control mostly off-speeds but not on-speeds. Our comparative analyses of the three unique NMDAR channel blockers provide a blueprint for developing therapeutic compounds with minimal side effects.

Structural insights into binding of therapeutic channel blockers in NMDA receptors.,Chou TH, Epstein M, Michalski K, Fine E, Biggin PC, Furukawa H Nat Struct Mol Biol. 2022 Jun;29(6):507-518. doi: 10.1038/s41594-022-00772-0. , Epub 2022 May 30. PMID:35637422^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Chou TH, Epstein M, Michalski K, Fine E, Biggin PC, Furukawa H. Structural insights into binding of therapeutic channel blockers in NMDA receptors. Nat Struct Mol Biol. 2022 Jun;29(6):507-518. PMID:35637422 doi:10.1038/s41594-022-00772-0