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-Structure paper
| タイトル | AI-based discovery and cryoEM structural elucidation of a K channel pharmacochaperone. |
|---|---|
| ジャーナル・号・ページ | Elife, Vol. 13, Year 2025 |
| 掲載日 | 2025年3月26日 |
著者 | Assmaa Elsheikh / Camden M Driggers / Ha H Truong / Zhongying Yang / John Allen / Niel M Henriksen / Katarzyna Walczewska-Szewc / Show-Ling Shyng / ![]() |
| PubMed 要旨 | Pancreatic K channel trafficking defects underlie congenital hyperinsulinism (CHI) cases unresponsive to the K channel opener diazoxide, the mainstay medical therapy for CHI. Current clinically used ...Pancreatic K channel trafficking defects underlie congenital hyperinsulinism (CHI) cases unresponsive to the K channel opener diazoxide, the mainstay medical therapy for CHI. Current clinically used K channel inhibitors have been shown to act as pharmacochaperones and restore surface expression of trafficking mutants; however, their therapeutic utility for K trafficking-impaired CHI is hindered by high affinity binding, which limits functional recovery of rescued channels. Recent structural studies of K channels employing cryo-electron microscopy (cryoEM) have revealed a promiscuous pocket where several known K pharmacochaperones bind. The structural knowledge provides a framework for discovering K channel pharmacochaperones with desired reversible inhibitory effects to permit functional recovery of rescued channels. Using an AI-based virtual screening technology AtomNet followed by functional validation, we identified a novel compound, termed Aekatperone, which exhibits chaperoning effects on K channel trafficking mutations. Aekatperone reversibly inhibits K channel activity with a half-maximal inhibitory concentration (IC) ~9 μM. Mutant channels rescued to the cell surface by Aekatperone showed functional recovery upon washout of the compound. CryoEM structure of K bound to Aekatperone revealed distinct binding features compared to known high affinity inhibitor pharmacochaperones. Our findings unveil a K pharmacochaperone enabling functional recovery of rescued channels as a promising therapeutic for CHI caused by K trafficking defects. |
リンク | Elife / PubMed:40135739 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 4.1 Å |
| 構造データ | EMDB-46820, PDB-9dfx: |
| 化合物 | ![]() ChemComp-ATP: ![]() ChemComp-K: ![]() PDB-1a4f: ![]() ChemComp-NAG: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / ATP-sensitive potassium channel / KATP channel / SUR1 / Kir6.2 / potassium transport / metabolic sensor / congenital hyperinsulinism / trafficking / pharmacochaperone |
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