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-Structure paper
| タイトル | Structural basis for the subtype-selectivity of K2.2 channel activators. |
|---|---|
| ジャーナル・号・ページ | Res Sq, Year 2025 |
| 掲載日 | 2025年5月16日 |
著者 | Miao Zhang / Young-Woo Nam / Alena Ramanishka / Yang Xu / Rose Marie Yasuda / Dohyun Im / Meng Cui / George Chandy / Heike Wulff / ![]() |
| PubMed 要旨 | Small-conductance (K2.2) and intermediate-conductance (K3.1) Ca-activated K channels are gated by a Ca-calmodulin dependent mechanism. NS309 potentiates the activity of both K2.2 and K3.1, while ...Small-conductance (K2.2) and intermediate-conductance (K3.1) Ca-activated K channels are gated by a Ca-calmodulin dependent mechanism. NS309 potentiates the activity of both K2.2 and K3.1, while rimtuzalcap selectively activates K2.2. Rimtuzalcap has been used in clinical trials for the treatment of spinocerebellar ataxia and essential tremor. We report cryo-electron microscopy structures of K2.2 channels bound with NS309 and rimtuzalcap, in addition to K3.1 channels with NS309. The different conformations of calmodulin and the cytoplasmic HC helices in the two channels underlie the subtype-selectivity of rimtuzalcap for K2.2. Calmodulin's N-lobes in the K2.2 structure are far apart and undergo conformational changes to accommodate either NS309 or rimtuzalcap. Calmodulin's Nlobes in the K3.1 structure are closer to each other and are constrained by the HC helices of K3.1, which allows binding of NS309 but not of the bulkier rimtuzalcap. These structures provide a framework for structure-based drug design targeting K2.2 channels. |
リンク | Res Sq / PubMed:40470184 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.71 - 3.59 Å |
| 構造データ | EMDB-70207, PDB-9o7s: EMDB-70217, PDB-9o85: EMDB-70240, PDB-9o93: EMDB-70275, PDB-9oa8: |
| 化合物 | ![]() ChemComp-K: ![]() ChemComp-1KP: ![]() ChemComp-CA: ![]() ChemComp-HOH: ![]() PDB-1b92: |
| 由来 |
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キーワード | TRANSPORT PROTEIN / Ion channel / Small-conductance calcium-activated potassium channel / Membrane protein / Intermediate conductance calcium-activated potassium channel / Calmodulin binding protein |
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