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-Structure paper
| タイトル | Structural insights into AQP3 channel closure upon pH and redox changes reveal an autoregulatory molecular mechanism. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 10997, Year 2025 |
| 掲載日 | 2025年12月22日 |
著者 | Peng Huang / Raminta Venskutonytė / Carter J Wilson / Sara Bsharat / Rashmi B Prasad / Pontus Gourdon / Isabella Artner / Bert L de Groot / Karin Lindkvist-Petersson / ![]() |
| PubMed 要旨 | Regulation of intracellular levels of reactive oxygen species (ROS) remains poorly understood. Aquaporin 3 (AQP3) facilitates the membrane transport of hydrogen peroxide (HO), a key ROS signaling ...Regulation of intracellular levels of reactive oxygen species (ROS) remains poorly understood. Aquaporin 3 (AQP3) facilitates the membrane transport of hydrogen peroxide (HO), a key ROS signaling molecule. Here we elucidate the molecular mechanism of AQP3 and show that its regulatory properties are both pH dependent and autoregulated by HO. Using single particle cryo-electron microscopy, we present open and closed conformations of human AQP3. At pH 8.0, the channel adopts an open state, while acidic pH or exposure to HO promotes closure via a large conformational rearrangement of extracellular loop E. These findings reveal a mechanism for autoregulation of HO transport and establish AQP3 as a key modulator of redox homeostasis in human pancreatic β-cells. |
リンク | Nat Commun / PubMed:41429774 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.0 - 3.2 Å |
| 構造データ | EMDB-53343, PDB-9qsx: EMDB-53344, PDB-9qsy: EMDB-53345, PDB-9qsz: |
| 化合物 | ![]() ChemComp-GOL: ![]() PDB-1h8k: ![]() ChemComp-HOH: ![]() ChemComp-PEO: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / glycerol channel / hydrogen peroxide transport / tetramer |
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homo sapiens (ヒト)
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