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基本情報
登録情報 | データベース: PDB / ID: 8qzc | |||||||||
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タイトル | Structure of calcium-bound mTMEM16A(ac)-L647V/I733V chloride channel at 3.29 A resolution | |||||||||
![]() | Anoctamin-1 | |||||||||
![]() | MEMBRANE PROTEIN / calcium-activated chloride channel / anoctamin-1 | |||||||||
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 / positive regulation of insulin secretion involved in cellular response to glucose stimulus ...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 / positive regulation of insulin secretion involved in cellular response to glucose stimulus / chloride channel complex / chloride transmembrane transport / regulation of membrane potential / cell projection / establishment of localization in cell / presynaptic membrane / cellular response to heat / 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 / クライオ電子顕微鏡法 / 解像度: 3.29 Å | |||||||||
![]() | Lam, A.K.M. / Dutzler, R. | |||||||||
資金援助 | European Union, ![]()
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![]() | ![]() タイトル: Mechanistic basis of ligand efficacy in the calcium-activated chloride channel TMEM16A. 著者: Andy Km Lam / Raimund Dutzler / ![]() 要旨: Agonist binding in ligand-gated ion channels is coupled to structural rearrangements around the binding site, followed by the opening of the channel pore. In this process, agonist efficacy describes ...Agonist binding in ligand-gated ion channels is coupled to structural rearrangements around the binding site, followed by the opening of the channel pore. In this process, agonist efficacy describes the equilibrium between open and closed conformations in a fully ligand-bound state. Calcium-activated chloride channels in the TMEM16 family are important sensors of intracellular calcium signals and are targets for pharmacological modulators, yet a mechanistic understanding of agonist efficacy has remained elusive. Using a combination of cryo-electron microscopy, electrophysiology, and autocorrelation analysis, we now show that agonist efficacy in the ligand-gated channel TMEM16A is dictated by the conformation of the pore-lining helix α6 around the Ca -binding site. The closure of the binding site, which involves the formation of a π-helix below a hinge region in α6, appears to be coupled to the opening of the inner pore gate, thereby governing the channel's open probability and conductance. Our results provide a mechanism for agonist binding and efficacy and a structural basis for the design of potentiators and partial agonists in the TMEM16 family. | |||||||||
履歴 |
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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 | ![]() | 273.7 KB | 表示 | ![]() |
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PDB形式 | ![]() | 209.8 KB | 表示 | ![]() |
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その他 | ![]() |
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アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 18774MC 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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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 111030.945 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #2: 化合物 | ChemComp-CA / 研究の焦点であるリガンドがあるか | Y | Has protein modification | Y | |
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-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: mouse TMEM16A ac splice variant with introduced mutations L647V and I733V in complex with calcium タイプ: ORGANELLE OR CELLULAR COMPONENT / 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: 7.4 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE-PROPANE |
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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: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 130000 X / 最大 デフォーカス(公称値): 2400 nm / 最小 デフォーカス(公称値): 1000 nm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 電子線照射量: 62.5 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
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3次元再構成 | 解像度: 3.29 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 144934 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
精密化 | 交差検証法: NONE 立体化学のターゲット値: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 54.42 Å2 | ||||||||||||||||||||||||
拘束条件 |
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