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-Structure paper
タイトル | Structural insights into the lipid and ligand regulation of a human neuronal KCNQ channel. |
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ジャーナル・号・ページ | Neuron, Vol. 110, Issue 2, Page 237-247.e4, Year 2022 |
掲載日 | 2022年1月19日 |
著者 | You Zheng / Heng Liu / Yuxin Chen / Shaowei Dong / Fang Wang / Shengyi Wang / Geng-Lin Li / Yilai Shu / Fei Xu / |
PubMed 要旨 | The KCNQ family (KCNQ1-KCNQ5) of voltage-gated potassium channels plays critical roles in many physiological and pathological processes. It is known that the channel opening of all KCNQs relies on ...The KCNQ family (KCNQ1-KCNQ5) of voltage-gated potassium channels plays critical roles in many physiological and pathological processes. It is known that the channel opening of all KCNQs relies on the signaling lipid molecule phosphatidylinositol 4,5-bisphosphate (PIP2). However, the molecular mechanism of PIP2 in modulating the opening of the four neuronal KCNQ channels (KCNQ2-KCNQ5), which are essential for regulating neuronal excitability, remains largely elusive. Here, we report the cryoelectron microscopy (cryo-EM) structures of human KCNQ4 determined in complex with the activator ML213 in the absence or presence of PIP2. Two PIP2 molecules are identified in the open-state structure of KCNQ4, which act as a bridge to couple the voltage-sensing domain (VSD) and pore domain (PD) of KCNQ4 leading to the channel opening. Our findings reveal the binding sites and activation mechanisms of ML213 and PIP2 for neuronal KCNQ channels, providing a framework for therapeutic intervention targeting on these important channels. |
リンク | Neuron / PubMed:34767770 |
手法 | EM (単粒子) |
解像度 | 2.79 - 2.96 Å |
構造データ | EMDB-32044, PDB-7vnp: EMDB-32045, PDB-7vnq: EMDB-32046, PDB-7vnr: |
化合物 | ChemComp-PT5: ChemComp-K: ChemComp-7YV: |
由来 |
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キーワード | MEMBRANE PROTEIN / KCNQ4 / ML213 / PIP2 / cryo-EM / nanodisc / digitonin |