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-Structure paper
| タイトル | Structural basis for domain coupling in heteromeric glycine receptors revealed by an atypical allosteric agonist. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 12, Issue 7, Page eaeb2036, Year 2026 |
| 掲載日 | 2026年2月13日 |
著者 | Eric Gibbs / Bjarne Feddersen / Kayla J Kindig / David Seiferth / Philip C Biggin / Sudha Chakrapani / ![]() |
| PubMed 要旨 | Glycine receptors (GlyRs), pentameric ligand-gated ion channels (pLGICs), mediate sensory and motor functions. GlyR functional states are well characterized; however, structural details of ...Glycine receptors (GlyRs), pentameric ligand-gated ion channels (pLGICs), mediate sensory and motor functions. GlyR functional states are well characterized; however, structural details of transitions between states remain undefined. Here, we determined cryo-electron microscopy structures of GlyRα1β (with gephyrin E-domain) at varying concentrations of ivermectin, a transmembrane domain (TMD) allosteric agonist, and at saturating concentrations of strychnine, a competitive antagonist at the extracellular domain (ECD). Electrophysiology shows that ivermectin activates GlyR even with strychnine present. Structures with both ligands reveal intermediate states featuring a desensitized TMD and an ECD between closed and desensitized conformations, providing insights into domain cooperativity and ligand efficacy. Molecular dynamics simulations show how ivermectin affects strychnine dynamics. These data support a model where ivermectin activates GlyRs through a concerted and near-symmetric TMD mechanism, whereas allosteric ECD motions are graded and spatially heterogeneous. These findings reveal unanticipated features of GlyR gating and establish principles of allosteric modulation applicable to pLGICs. |
リンク | Sci Adv / PubMed:41686897 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.86 - 2.89 Å |
| 構造データ | EMDB-71705, PDB-9pkw: EMDB-71706, PDB-9pkx: EMDB-71707, PDB-9pky: EMDB-71708, PDB-9pkz: |
| 化合物 | ![]() ChemComp-SY9: ![]() ChemComp-NAG: ![]() ChemComp-IVM: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Ion Channel / Pentameric / Glycine / Receptor |
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