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-Structure paper
| タイトル | Delta-type glutamate receptors are ligand-gated ion channels. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 647, Issue 8091, Page 1063-1071, Year 2025 |
| 掲載日 | 2025年9月16日 |
著者 | Haobo Wang / Fairine Ahmed / Jeffrey Khau / Anish Kumar Mondal / Edward C Twomey / ![]() |
| PubMed 要旨 | Delta-type ionotropic glutamate receptors (iGluRs, also known as GluDs) are members of the iGluR ligand-gated ion channel family, yet their function remains unknown. Although GluDs are widely ...Delta-type ionotropic glutamate receptors (iGluRs, also known as GluDs) are members of the iGluR ligand-gated ion channel family, yet their function remains unknown. Although GluDs are widely expressed in the brain, have key roles in synaptic organization, and harbour disease-linked mutations, whether they retain iGluR-like channel function is debated as currents have not been directly observed. Here we define GluDs as ligand-gated ion channels that are tightly regulated in cellular contexts by purifying human GluD2 (hGluD2) and directly characterizing its structure and function using cryo-electron microscopy and bilayer recordings. We show that hGluD2 is activated by D-serine and GABA (γ-aminobutyric acid), with augmented activation at physiological temperatures. We reveal that hGluD2 contains an ion channel directly coupled to clamshell-like ligand-binding domains, which are coordinated by the amino-terminal domain above the ion channel. Ligand binding triggers channel opening via an asymmetric mechanism, and a cerebellar ataxia point mutation in the ligand-binding domain rearranges the receptor architecture and induces leak currents. Our findings demonstrate that GluDs possess the intrinsic biophysical properties of ligand-gated ion channels, reconciling prior conflicting observations to establish a framework for understanding their cellular regulation and for developing therapies targeting GluD2. |
リンク | Nature / PubMed:40957579 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.57 - 3.74 Å |
| 構造データ | EMDB-49888, PDB-9nwo: EMDB-49889, PDB-9nwp: EMDB-49890, PDB-9nwq: EMDB-70667, PDB-9ooo: EMDB-70668, PDB-9oop: |
| 化合物 | ![]() ChemComp-DSN: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Ligand-gated ion channel / ion channel / neurotransmitter receptor |
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