8usx

From Proteopedia

Glycine-bound GluN1a-3A NMDA receptor

Structural highlights

8usx is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 4.1Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

NMDZ1_HUMAN Defects in GRIN1 are the cause of mental retardation autosomal dominant type 8 (MRD8) [MIM:614254. Mental retardation is characterized by significantly below average general intellectual functioning associated with impairments in adaptative behavior and manifested during the developmental period.^[1]

Function

NMDZ1_HUMAN NMDA receptor subtype of glutamate-gated ion channels with high calcium permeability and voltage-dependent sensitivity to magnesium. Mediated by glycine. This protein plays a key role in synaptic plasticity, synaptogenesis, excitotoxicity, memory acquisition and learning. It mediates neuronal functions in glutamate neurotransmission. Is involved in the cell surface targeting of NMDA receptors (By similarity).

Publication Abstract from PubMed

N-methyl-d-aspartate receptors (NMDARs) and other ionotropic glutamate receptors (iGluRs) mediate most of the excitatory signaling in the mammalian brains in response to the neurotransmitter glutamate. Uniquely, NMDARs composed of GluN1 and GluN3 are activated exclusively by glycine, the neurotransmitter conventionally mediating inhibitory signaling when it binds to pentameric glycine receptors. The GluN1-3 NMDARs are vital for regulating neuronal excitability, circuit function, and specific behaviors, yet our understanding of their functional mechanism at the molecular level has remained limited. Here, we present cryo-electron microscopy structures of GluN1-3A NMDARs bound to an antagonist, CNQX, and an agonist, glycine. The structures show a 1-3-1-3 subunit heterotetrameric arrangement and an unprecedented pattern of GluN3A subunit orientation shift between the glycine-bound and CNQX-bound structures. Site-directed disruption of the unique subunit interface in the glycine-bound structure mitigated desensitization. Our study provides a foundation for understanding the distinct structural dynamics of GluN3 that are linked to the unique function of GluN1-3 NMDARs.

Structure and function of GluN1-3A NMDA receptor excitatory glycine receptor channel.,Michalski K, Furukawa H Sci Adv. 2024 Apr 12;10(15):eadl5952. doi: 10.1126/sciadv.adl5952. Epub 2024 Apr , 10. PMID:38598639^[2]

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

References

↑ Hamdan FF, Gauthier J, Araki Y, Lin DT, Yoshizawa Y, Higashi K, Park AR, Spiegelman D, Dobrzeniecka S, Piton A, Tomitori H, Daoud H, Massicotte C, Henrion E, Diallo O, Shekarabi M, Marineau C, Shevell M, Maranda B, Mitchell G, Nadeau A, D'Anjou G, Vanasse M, Srour M, Lafreniere RG, Drapeau P, Lacaille JC, Kim E, Lee JR, Igarashi K, Huganir RL, Rouleau GA, Michaud JL. Excess of de novo deleterious mutations in genes associated with glutamatergic systems in nonsyndromic intellectual disability. Am J Hum Genet. 2011 Mar 11;88(3):306-16. doi: 10.1016/j.ajhg.2011.02.001. Epub, 2011 Mar 3. PMID:21376300 doi:10.1016/j.ajhg.2011.02.001
↑ Michalski K, Furukawa H. Structure and function of GluN1-3A NMDA receptor excitatory glycine receptor channel. Sci Adv. 2024 Apr 12;10(15):eadl5952. PMID:38598639 doi:10.1126/sciadv.adl5952