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基本情報
登録情報 | データベース: PDB / ID: 8xlr | ||||||
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タイトル | Cryo-EM structure of Ca2+-bound TMEM16A in complex with Tamsulosin | ||||||
![]() | Anoctamin-1 | ||||||
![]() | LIPID BINDING PROTEIN / Inhibitor / Modulator / Complex / Ion channel | ||||||
機能・相同性 | ![]() glial cell projection elongation / trachea development / mucus secretion / intracellularly calcium-gated chloride channel activity / voltage-gated chloride channel activity / Stimuli-sensing channels / chloride transport / chloride channel activity / detection of temperature stimulus involved in sensory perception of pain / chloride channel complex ...glial cell projection elongation / trachea development / mucus secretion / intracellularly calcium-gated chloride channel activity / voltage-gated chloride channel activity / Stimuli-sensing channels / chloride transport / chloride channel activity / detection of temperature stimulus involved in sensory perception of pain / chloride channel complex / positive regulation of insulin secretion involved in cellular response to glucose stimulus / chloride transmembrane transport / regulation of membrane potential / cell projection / establishment of localization in cell / cellular response to heat / presynaptic membrane / phospholipase C-activating G protein-coupled receptor signaling pathway / apical plasma membrane / external side of plasma membrane / glutamatergic synapse / protein homodimerization activity / metal ion binding / identical protein binding / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / 解像度: 2.93 Å | ||||||
![]() | Li, H.L. / Li, S.L. / Li, S. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Tamsulosin ameliorates bone loss by inhibiting the release of Cl through wedging into an allosteric site of TMEM16A. 著者: Shiliang Li / Weijia Sun / Shuang Li / Lili Zhu / Shuai Guo / Jiaqi He / Yuheng Li / Chaoquan Tian / Zhenjiang Zhao / Tao Yu / Jianwei Li / Yiqing Zhang / Youlong Hai / Jiawen Wang / Yongjun ...著者: Shiliang Li / Weijia Sun / Shuang Li / Lili Zhu / Shuai Guo / Jiaqi He / Yuheng Li / Chaoquan Tian / Zhenjiang Zhao / Tao Yu / Jianwei Li / Yiqing Zhang / Youlong Hai / Jiawen Wang / Yongjun Zheng / Rui Wang / Xiaoyong Hu / Shukuan Ling / Honglin Li / Yingxian Li / ![]() 要旨: TMEM16A, a key calcium-activated chloride channel, is crucial for many physiological and pathological processes such as cancer, hypertension, and osteoporosis, etc. However, the regulatory mechanism ...TMEM16A, a key calcium-activated chloride channel, is crucial for many physiological and pathological processes such as cancer, hypertension, and osteoporosis, etc. However, the regulatory mechanism of TMEM16A is poorly understood, limiting the discovery of effective modulators. Here, we unveil an allosteric gating mechanism by presenting a high-resolution cryo-EM structure of TMEM16A in complex with a channel inhibitor that we identified, Tamsulosin, which is resolved at 2.93 Å. Tamsulosin wedges itself into a pocket within the extracellular domain of TMEM16A, surrounded by α1-α2, α5-α6, and α9-α10 loops. This binding stabilizes a transient preopen conformation of TMEM16A, which is activated by Ca ions while still preserving a closed pore to prevent Cl permeation. Validation of this binding site through computational, electrophysiological, and functional experiments, along with site-directed mutagenesis, confirmed the pivotal roles of the pocket-lining residues R605 and E624 on α5-α6 loop in modulating Tamsulosin binding and pore activity. Tamsulosin induces significant positional shifts in extracellular loops, particularly the α5-α6 loop, which moves toward the extracellular exit of the pore, leading to noticeable structural rearrangements in pore-lining helices. The hinges induced by P595 in α5 and G711 in α7 introduce flexibility to the transmembrane helices, orienting Y593 to collaborate with I641 in effectively gating the preopening pore. Notably, Tamsulosin demonstrates significant antiosteoporotic effects by inhibiting TMEM16A, suggesting potential for its repurposing in new therapeutic indications. Our study not only enhances our understanding of the gating mechanism of TMEM16A inhibition but also facilitates structure-based drug design targeting TMEM16A. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 338.5 KB | 表示 | ![]() |
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PDB形式 | ![]() | 274.1 KB | 表示 | ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.3 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.3 MB | 表示 | |
XML形式データ | ![]() | 60.6 KB | 表示 | |
CIF形式データ | ![]() | 87.3 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 38456MC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
-タンパク質 / 糖 , 2種, 10分子 AB

#1: タンパク質 | 分子量: 111058.992 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #2: 糖 | ChemComp-NAG / |
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-非ポリマー , 4種, 58分子 






#3: 化合物 | ChemComp-C14 / #4: 化合物 | ChemComp-CA / #5: 化合物 | #6: 化合物 | |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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Has protein modification | Y |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: Structure of Tamsulosin- and calcium-bound mTMEM16A chloride channel タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT | ||||||||||||||||||||
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由来(天然) | 生物種: ![]() ![]() | ||||||||||||||||||||
由来(組換発現) | 生物種: ![]() | ||||||||||||||||||||
緩衝液 | pH: 7.5 | ||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 4 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: NO | ||||||||||||||||||||
試料支持 | グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 1000 nm |
撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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解析
EMソフトウェア | 名称: PHENIX / バージョン: 1.20.1_4487: / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.93 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 12322 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
原子モデル構築 | プロトコル: AB INITIO MODEL | ||||||||||||||||||||||||
拘束条件 |
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