FEATURES

FAMILY

glutamate-gated ion channel (TC 1.A.10.1) family

DESCRIPTION

Also known as NMDE2_RAT, Grin2b. Component of NMDA receptor complexes that function as heterotetrameric, ligand-gated ion channels with high calcium permeability and voltage-dependent sensitivity to magnesium. Channel activation requires binding of the neurotransmitter glutamate to the epsilon subunit, glycine binding to the zeta subunit, plus membrane depolarization to eliminate channel inhibition by Mg(2+) (PubMed:1350383, PubMed:19910922, PubMed:21677647, PubMed:24876489, PubMed:27135925, PubMed:27916457). Sensitivity to glutamate and channel kinetics depend on the subunit composition (Probable). 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. Contributes to neural pattern formation in the developing brain. Plays a role in long-term depression (LTD) of hippocampus membrane currents and in synaptic plasticity (By similarity). Heterotetramer. Forms heterotetrameric channels composed of two zeta subunits (GRIN1), and two epsilon subunits (GRIN2A, GRIN2B, GRIN2C or GRIN2D) (in vitro) (PubMed:1350383, PubMed:19910922, PubMed:21677647, PubMed:24876489, PubMed:27135925, PubMed:27916457). Can also form heterotetrameric channels that contain at least one zeta subunit (GRIN1), at least one epsilon subunit, plus GRIN3A or GRIN3B. In vivo, the subunit composition may depend on the expression levels of the different subunits. Found in a complex with GRIN1, GRIN3A and PPP2CB. Found in a complex with GRIN1 and GRIN3B. Interacts with MAGI3. Interacts with HIP1 and NETO1. Interacts with PDZ domains of PATJ, DLG3 and DLG4. Interacts with DAPK1 (By similarity). Found in a complex with GRIN1 and PRR7 (PubMed:27458189). Interacts with PRR7 (PubMed:27458189). Interacts with CAMK2A (By similarity). Interacts with ARC; preventing ARC oligomerization (PubMed:31080121). Interacts with TMEM25 (By similarity).

EXTERNAL LINKS

Grin2b

Mutations

Mutation(s) distribution

Mutations table