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-Structure paper
タイトル | Cryo-EM Structure of K-Bound hERG Channel Complexed with the Blocker Astemizole. |
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ジャーナル・号・ページ | Structure, Vol. 29, Issue 3, Page 203-212.e4, Year 2021 |
掲載日 | 2021年3月4日 |
著者 | Tatsuki Asai / Naruhiko Adachi / Toshio Moriya / Hideyuki Oki / Takamitsu Maru / Masato Kawasaki / Kano Suzuki / Sisi Chen / Ryohei Ishii / Kazuko Yonemori / Shigeru Igaki / Satoshi Yasuda / Satoshi Ogasawara / Toshiya Senda / Takeshi Murata / |
PubMed 要旨 | The hERG channel is a voltage-gated potassium channel involved in cardiac repolarization. Off-target hERG inhibition by drugs has become a critical issue in the pharmaceutical industry. The three- ...The hERG channel is a voltage-gated potassium channel involved in cardiac repolarization. Off-target hERG inhibition by drugs has become a critical issue in the pharmaceutical industry. The three-dimensional structure of the hERG channel was recently reported at 3.8-Å resolution using cryogenic electron microscopy (cryo-EM). However, the drug inhibition mechanism remains unclear because of the scarce structural information regarding the drug- and potassium-bound hERG channels. In this study, we obtained the cryo-EM density map of potassium-bound hERG channel complexed with astemizole, a well-known hERG inhibitor that increases risk of potentially fatal arrhythmia, at 3.5-Å resolution. The structure suggested that astemizole inhibits potassium conduction by binding directly below the selectivity filter. Furthermore, we propose a possible binding model of astemizole to the hERG channel and provide insights into the unusual sensitivity of hERG to several drugs. |
リンク | Structure / PubMed:33450182 |
手法 | EM (単粒子) |
解像度 | 3.7 - 3.9 Å |
構造データ | EMDB-30412, PDB-7cn0: EMDB-30413, PDB-7cn1: |
化合物 | ChemComp-K: |
由来 |
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キーワード | TRANSPORT PROTEIN / potassium channel |