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-Structure paper
| タイトル | Mechanism of phosphoinositide regulation of lysosomal pH via inhibition of CLC-7. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年10月2日 |
著者 | Jacob K Hilton / Yifei Lin / Eric Sefah / Justin C Deme / Joanne L Parker / Matthew J Langton / Michael Grabe / Susan Lea / Simon Newstead / Joseph A Mindell / ![]() |
| PubMed 要旨 | Lysosomes process cellular waste and coordinate responses to metabolic challenge. Central to lysosomal homeostasis are phosphoinositide lipids, key signaling molecules which establish organelle ...Lysosomes process cellular waste and coordinate responses to metabolic challenge. Central to lysosomal homeostasis are phosphoinositide lipids, key signaling molecules which establish organelle identity, regulate membrane dynamics and are tightly linked to the pathophysiology and therapy of lysosomal storage disorders, neurodegeneration, and cancer. Phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2) interacts with multiple lysosomal membrane proteins and plays a critical role in regulating lysosomal pH by directly inhibiting the chloride/proton antiporter ClC-7, though the molecular mechanism of this inhibition remains unclear. Here, using a combination of functional, structural, and computational analysis, we demonstrate that PI(3,5)P2 binding dramatically remodels the structure of ClC-7 by inducing close association between cytosolic and transmembrane domains. Disease-causing mutations show increased transport activity through loss of PI(3,5)P2 binding and subsequent inhibition. Conversely, ClC-7 activation is correlated with dissociation and increased disorder of the cytoplasmic domain along with novel transmembrane domain conformations, revealing a mechanistic link between specific lysosomal lipids, transporter regulation, and the enigmatic basis of the ClC-7 slow gate. |
リンク | bioRxiv / PubMed:41256531 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 1.8 - 2.7 Å |
| 構造データ | EMDB-51097, PDB-9g6c: EMDB-51098, PDB-9g6d: EMDB-51099, PDB-9g6e: |
| 化合物 | ![]() ChemComp-ATP: ![]() ChemComp-MG: ![]() ChemComp-CL: ![]() PDB-1iit: ![]() ChemComp-Y01: ![]() ChemComp-HOH: |
| 由来 |
|
キーワード | MEMBRANE PROTEIN / Lysosomal transporter / pH Regulation / Membrane Complex / Transporter |
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