National Institutes of Health/National Institute of Mental Health (NIH/NIMH)
MH085926
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
NS111745
米国
引用
ジャーナル: Neuron / 年: 2025 タイトル: Structural basis for channel gating and blockade in tri-heteromeric GluN1-2B-2D NMDA receptor. 著者: Hyunook Kang / Max Epstein / Tue G Banke / Riley Perszyk / Noriko Simorowski / Srinu Paladugu / Dennis C Liotta / Stephen F Traynelis / Hiro Furukawa / 要旨: Discrete activation of N-methyl-D-aspartate receptor (NMDAR) subtypes by glutamate and the co-agonist glycine is fundamental to neuroplasticity. A distinct variant, the tri-heteromeric receptor, ...Discrete activation of N-methyl-D-aspartate receptor (NMDAR) subtypes by glutamate and the co-agonist glycine is fundamental to neuroplasticity. A distinct variant, the tri-heteromeric receptor, comprising glycine-binding GluN1 and two types of glutamate-binding GluN2 subunits, exhibits unique pharmacological characteristics, notably enhanced sensitivity to the anti-depressant channel blocker S-(+)-ketamine. Despite its significance, the structural mechanisms underlying ligand gating and channel blockade of tri-heteromeric NMDARs remain poorly understood. Here, we identify and characterize tri-heteromeric GluN1-2B-2D NMDAR in the adult brain, resolving its structures in the activated, inhibited, and S-(+)-ketamine-blocked states. These structures reveal the ligand-dependent conformational dynamics that modulate the tension between the extracellular domain and transmembrane channels, governing channel gating and blockade. Additionally, we demonstrate that the inhibitor (S)-DQP-997-74 selectively decouples linker tension in GluN2D, offering insights into subtype-selective targeting for cognitive modulation.