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論文
- タイトル
- タイトル(英)
- Extracellular K<sup>+</sup>modulates the pore conformations of Cys-loop receptor anion channels
- 参照URL
- https://researchmap.jp/mujinaclass/published_papers/51271797
- 著者
- 著者(英)
- Takushi Shimomura,Yoshihiro Kubo,Minoru Saitoe,Yoshinori Suzuki
- 担当区分
- 最終著者, 責任著者
- 概要
- 概要(英)
- Abstract K<sup>+</sup>is an essential cation for life, but no eukaryotic membrane protein with a modulatory site for extracellular K<sup>+</sup>has been discovered. Here, we report that a Cys-loop receptor, CG12344/DmAlka, expressed in theDrosophilanervous system, is selectively modulated by physiological concentration of extracellular K<sup>+</sup>. Structural prediction, electrophysiology and phylogenetic analysis of DmAlka revealed the extracellular K<sup>+</sup>binding site that mimics the hydrated chemical environment for K<sup>+</sup>, as observed in K<sup>+</sup>channel pore. Furthermore, we found that K<sup>+</sup>binding induces a previously unrecognized “mode-switching,” altering properties ranging from ligand sensitivity to ion selectivity. Notably, a human glycine receptor variant also exhibited similar mechanisms. Our study reveals a novel regulatory mechanism of Cys-loop receptors that directly links the extracellular K<sup>+</sup>signaling to Cl<sup>-</sup>conductance in animals.
- 出版者・発行元
- 出版者・発行元(英)
- Cold Spring Harbor Laboratory
- 誌名
- 誌名(英)
- bioRxiv
- 巻
- 号
- 開始ページ
- 終了ページ
- 出版年月
- 2025年6月17日
- 査読の有無
- 招待の有無
- 掲載種別
- ISSN
- DOI URL
- https://doi.org/10.1101/2025.06.15.658987
- 共同研究・競争的資金等の研究課題
- 未知の機構を持つ新奇イオンチャネルのグリア細胞における生理機能の解明
研究者
鈴木 力憲
(スズキ ヨシノリ)