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-Structure paper
| タイトル | Structure and mechanism of human vesicular polyamine transporter. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 4142, Year 2025 |
| 掲載日 | 2025年5月3日 |
著者 | Yi Guo / Ge Yang / Haijiao Liu / Jin Chai / Jie Chen / John Shanklin / Qun Liu / Bin Liu / Min Lu / ![]() |
| PubMed 要旨 | Polyamines play essential roles in gene expression and modulate neuronal transmission in mammals. Vesicular polyamine transporters (VPAT) from the SLC18 family exploit the transmembrane H gradient to ...Polyamines play essential roles in gene expression and modulate neuronal transmission in mammals. Vesicular polyamine transporters (VPAT) from the SLC18 family exploit the transmembrane H gradient to translocate polyamines into secretory vesicles, enabling the quantal release of polyamine neuromodulators and underpinning learning and memory formation. Here, we report the cryo-electron microscopy structures of human VPAT in complex with spermine, spermidine, H, or tetrabenazine, elucidating discrete lumen-facing states of the antiporter and pivotal interactions between VPAT and its substrate or inhibitor. Leveraging structure-inspired mutagenesis studies and protein structure prediction, we deduce an unforeseen mechanism whereby the polyamine and H compete for multiple acidic protein residues both directly and indirectly, and rationalize how the antidopaminergic therapeutic tetrabenazine impedes vesicular transport of polyamines. This study unravels the mechanism of an H-coupled polyamine antiporter, reveals mechanistic diversity between VPAT and other SLC18 antiporters, and raises new prospects for combating human disorders of polyamine homeostasis. |
リンク | Nat Commun / PubMed:40319071 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.3 - 3.97 Å |
| 構造データ | EMDB-46616, PDB-9d7u: EMDB-46617, PDB-9d7v: EMDB-46618, PDB-9d7w: EMDB-46619, PDB-9d7x: |
| 化合物 | ![]() ChemComp-HOH: ![]() ChemComp-SPD: ![]() ChemComp-YHL: ![]() ChemComp-SPM: |
| 由来 |
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キーワード | MEMBRANE PROTEIN |
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homo sapiens (ヒト)
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