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-Structure paper
タイトル | Molecular basis for ligand activation of the human KCNQ2 channel. |
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ジャーナル・号・ページ | Cell Res, Vol. 31, Issue 1, Page 52-61, Year 2021 |
掲載日 | 2020年9月3日 |
著者 | Xiaoxiao Li / Qiansen Zhang / Peipei Guo / Jie Fu / Lianghe Mei / Dashuai Lv / Jiangqin Wang / Dongwu Lai / Sheng Ye / Huaiyu Yang / Jiangtao Guo / |
PubMed 要旨 | The voltage-gated potassium channel KCNQ2 is responsible for M-current in neurons and is an important drug target to treat epilepsy, pain and several other diseases related to neuronal hyper- ...The voltage-gated potassium channel KCNQ2 is responsible for M-current in neurons and is an important drug target to treat epilepsy, pain and several other diseases related to neuronal hyper-excitability. A list of synthetic compounds have been developed to directly activate KCNQ2, yet our knowledge of their activation mechanism is limited, due to lack of high-resolution structures. Here, we report cryo-electron microscopy (cryo-EM) structures of the human KCNQ2 determined in apo state and in complex with two activators, ztz240 or retigabine, which activate KCNQ2 through different mechanisms. The activator-bound structures, along with electrophysiology analysis, reveal that ztz240 binds at the voltage-sensing domain and directly stabilizes it at the activated state, whereas retigabine binds at the pore domain and activates the channel by an allosteric modulation. By accurately defining ligand-binding sites, these KCNQ2 structures not only reveal different ligand recognition and activation mechanisms, but also provide a structural basis for drug optimization and design. |
リンク | Cell Res / PubMed:32884139 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.1 - 3.9 Å |
構造データ | EMDB-30443, PDB-7cr0: EMDB-30444, PDB-7cr1: EMDB-30445, PDB-7cr2: EMDB-30446, PDB-7cr3: EMDB-30447, PDB-7cr4: EMDB-30448, PDB-7cr7: |
化合物 | ChemComp-GB9: ChemComp-FBX: |
由来 |
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キーワード | TRANSPORT PROTEIN / ion channel |