Biotechnology and Biological Sciences Research Council (BBSRC)
BB/T002018/1
英国
Biotechnology and Biological Sciences Research Council (BBSRC)
BB/S008608/1
英国
Medical Research Council (MRC, United Kingdom)
MR/W017741/1
英国
Wellcome Trust
WT084655MA
英国
Wellcome Trust
102161/B/13/Z
英国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Cryo-EM structure of the human THIK-1 K2P K channel reveals a lower Y gate regulated by lipids and anesthetics. 著者: Karin E J Rödström / Bisher Eymsh / Peter Proks / Mehtab S Hayre / Sönke Cordeiro / Edward Mendez-Otalvaro / Christian Madry / Anna Rowland / Wojciech Kopec / Simon Newstead / Thomas ...著者: Karin E J Rödström / Bisher Eymsh / Peter Proks / Mehtab S Hayre / Sönke Cordeiro / Edward Mendez-Otalvaro / Christian Madry / Anna Rowland / Wojciech Kopec / Simon Newstead / Thomas Baukrowitz / Marcus Schewe / Stephen J Tucker / 要旨: THIK-1 (KCNK13) is a halothane-inhibited and anionic-lipid-activated two-pore domain (K2P) K channel implicated in microglial activation and neuroinflammation, and a current target for the treatment ...THIK-1 (KCNK13) is a halothane-inhibited and anionic-lipid-activated two-pore domain (K2P) K channel implicated in microglial activation and neuroinflammation, and a current target for the treatment of neurodegenerative disorders, for example Alzheimer's disease and amyothropic lateral sclerosis (ALS). However, compared to other K2P channels, little is known about the structural and functional properties of THIK-1. Here we present a 3.16-Å-resolution cryo-EM structure of human THIK-1 that reveals several distinct features, in particular, a tyrosine in M4 that contributes to a lower 'Y gate' that opens upon activation by physiologically relevant G-protein-coupled receptor and lipid signaling pathways. We demonstrate that linoleic acid bound within a modulatory pocket adjacent to the filter influences channel activity, and that halothane inhibition involves a binding site within the inner cavity, both resulting in conformational changes to the Y gate. Finally, the extracellular cap domain contains positively charged residues that line the ion exit pathway and contribute to the distinct biophysical properties of this channel. Overall, our results provide structural insights into THIK-1 function and identify distinct regulatory sites that expand its potential as a drug target for the modulation of microglial function.
タンパク質・ペプチド: Potassium channel subfamily K member 13
リガンド: LINOLEIC ACID
リガンド: POTASSIUM ION
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超分子 #1: K2P13.1 homodimer
超分子
名称: K2P13.1 homodimer / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1 詳細: Protein generated by removal of the 10xHis and FLAG purification tags with HRV 3C protease cleavage