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-Structure paper
| タイトル | Structures of Ostα/β reveal a unique fold and bile acid transport mechanism. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 651, Issue 8104, Page 260-267, Year 2026 |
| 掲載日 | 2026年1月28日 |
著者 | Xuemei Yang / Nana Cui / Tianyu Li / Xinheng He / Heng Zhang / Canrong Wu / Yang Li / Xiong Ma / H Eric Xu / ![]() |
| PubMed 要旨 | Bile acid and steroid hormone homeostasis are critical for human health, with disruptions linked to metabolic and endocrine disorders. The organic solute transporter Ostα/β, essential for bile acid ...Bile acid and steroid hormone homeostasis are critical for human health, with disruptions linked to metabolic and endocrine disorders. The organic solute transporter Ostα/β, essential for bile acid efflux in enterohepatic circulation, has long defied mechanistic elucidation. Here we present cryogenic electron microscopy structures of human Ostα/β in apo and substrate-bound states at 2.6-3.1 Å resolution, revealing a distinctive membrane protein architecture that defines a new transporter class. Ostα/β forms a symmetric tetramer of heterodimers, with each Ostα subunit showing a new seven-transmembrane fold, augmented by a single transmembrane helix of Ostβ. This architecture is stabilized by extensive lipid modifications, including a palmitoylated cysteine-rich motif that forms a lateral substrate-binding groove. The structures uncover a unique transport pathway featuring two substrate-binding sites connected by an amphipathic helix-gated conduit. This design, conserved in the evolutionarily related TMEM184 family, suggests an ancient mechanism for substrate translocation. Electrophysiological studies demonstrate voltage-sensitive, bidirectional transport driven by electrochemical gradients, elucidating the efflux role of Ostα/β in vivo. Lipid interactions, notably palmitoylation-dependent trafficking, emerge as critical for stability and function. These findings clarify the molecular mechanism of Ostα/β, provide a structural basis for disease-associated mutations and establish a paradigm for lipid-modified membrane transport. |
リンク | Nature / PubMed:41606328 |
| 手法 | EM (単粒子) |
| 解像度 | 2.6 - 3.12 Å |
| 構造データ | EMDB-64364, PDB-9unv: EMDB-64369, PDB-9uo1: EMDB-64370, PDB-9uo2: |
| 化合物 | ![]() ChemComp-CLR: ![]() ChemComp-P0E: ![]() ChemComp-LPE: ![]() ChemComp-NAG: ![]() ChemComp-PLM: ![]() PDB-1epx: ![]() ChemComp-76F: ![]() ChemComp-ZWY: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Complex / bile acids / substrate / transport / heterodimer |
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