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-Structure paper
| タイトル | Structural and functional basis of mechanosensitive TMEM63 channelopathies. |
|---|---|
| ジャーナル・号・ページ | Neuron, Vol. 113, Issue 15, Page 2474-22489.e5, Year 2025 |
| 掲載日 | 2025年8月6日 |
著者 | Wang Zheng / Augustus J Lowry / Harper E Smith / Jiale Xie / Shaun Rawson / Chen Wang / Jin Ou / Marcos Sotomayor / Tian-Min Fu / Huanghe Yang / Jeffrey R Holt / ![]() |
| PubMed 要旨 | TMEM63A, -B, and -C constitute a mammalian family of mechanosensitive ion channels that are mutated in neurodevelopmental disorders. The molecular mechanisms underlying TMEM63 activation by force and ...TMEM63A, -B, and -C constitute a mammalian family of mechanosensitive ion channels that are mutated in neurodevelopmental disorders. The molecular mechanisms underlying TMEM63 activation by force and the impact of disease-associated mutations have not been clarified. Here, we elucidate the structural and functional bases of a prevalent TMEM63B mutation p.V44M. We first found that TMEM63B p.V44M and the homologous TMEM63A p.V53M are gain-of-function mutations that do not enhance channel activity but instead evoke constitutive lipid scramblase activity. We then solved TMEM63A p.V53M mutant structures in both closed and lipid-open states, which revealed major rearrangements of pore-lining helices, creating a lateral cleft across the membrane. Simulation studies revealed lipid scrambling through this cleft. The structural rearrangements were triggered by disruption of a surface-proximal hydrophobic latch, a putative force-sensing module that includes a cluster of disease mutation sites. Our findings provide mechanistic insight into TMEM63 channelopathies and suggest a possible force-sensing mechanism. |
リンク | Neuron / PubMed:40480214 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.95 - 3.65 Å |
| 構造データ | EMDB-49158, PDB-9n93: EMDB-49160, PDB-9n95: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Ion channel / Mechanosensitive / lipid scramblase |
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