- PDB-9dxt: Ligand-binding and transmembrane domains of kainate receptor GluK... -
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データベース: PDB / ID: 9dxt
タイトル
Ligand-binding and transmembrane domains of kainate receptor GluK2 in complex with positive allosteric modulator BPAM-344 and channel blocker Kukoamine-A
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
R01 NS083660
米国
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)
R01 NS107253
米国
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)
R01 AR078814
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
R01 CA206573
米国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: Trapping of spermine, Kukoamine A, and polyamine toxin blockers in GluK2 kainate receptor channels. 著者: Shanti Pal Gangwar / Maria V Yelshanskaya / Muhammed Aktolun / Laura Y Yen / Thomas P Newton / Kristian Strømgaard / Maria G Kurnikova / Alexander I Sobolevsky / 要旨: Kainate receptors (KARs) are a subtype of ionotropic glutamate receptor (iGluR) channels, a superfamily of ligand-gated ion channels which mediate the majority of excitatory neurotransmission in the ...Kainate receptors (KARs) are a subtype of ionotropic glutamate receptor (iGluR) channels, a superfamily of ligand-gated ion channels which mediate the majority of excitatory neurotransmission in the central nervous system. KARs modulate neuronal circuits and plasticity during development and are implicated in neurological disorders, including epilepsy, depression, schizophrenia, anxiety, and autism. Calcium-permeable KARs undergo ion channel block, but the therapeutic potential of channel blockers remains underdeveloped, mainly due to limited structural knowledge. Here, we present closed-state structures of GluK2 KAR homotetramers in complex with ion channel blockers NpTx-8, PhTx-74, Kukoamine A, and spermine. We find that blockers reside inside the GluK2 ion channel pore, intracellular to the closed M3 helix bundle-crossing gate, with their hydrophobic heads filling the central cavity and positively charged polyamine tails spanning the selectivity filter. Molecular dynamics (MD) simulations of our structures illuminate interactions responsible for different affinity and binding poses of the blockers. Our structures elucidate the trapping mechanism of KAR channel block and provide a template for designing new blockers that can selectively target calcium-permeable KARs in neuropathologies.