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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9o51 | |||||||||||||||||||||||||||
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| タイトル | Cryo-EM structure of the human SK2-4 chimera/calmodulin channel complex in the Ca2+ free state | |||||||||||||||||||||||||||
要素 |
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キーワード | TRANSPORT PROTEIN / Ion channel / Calcium / Potassium / Calmodulin | |||||||||||||||||||||||||||
| 機能・相同性 | 機能・相同性情報intermediate conductance calcium-activated potassium channel activity / saliva secretion / small conductance calcium-activated potassium channel activity / Acetylcholine inhibits contraction of outer hair cells / stabilization of membrane potential / membrane repolarization during atrial cardiac muscle cell action potential / Ca2+ activated K+ channels / macropinocytosis / calcium-activated potassium channel activity / regulation of calcium ion import across plasma membrane ...intermediate conductance calcium-activated potassium channel activity / saliva secretion / small conductance calcium-activated potassium channel activity / Acetylcholine inhibits contraction of outer hair cells / stabilization of membrane potential / membrane repolarization during atrial cardiac muscle cell action potential / Ca2+ activated K+ channels / macropinocytosis / calcium-activated potassium channel activity / regulation of calcium ion import across plasma membrane / positive regulation of potassium ion transmembrane transport / inward rectifier potassium channel activity / positive regulation of T cell receptor signaling pathway / regulation of potassium ion transmembrane transport / cell volume homeostasis / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / phospholipid translocation / Calmodulin induced events / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / negative regulation of high voltage-gated calcium channel activity / PKA activation / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / negative regulation of calcium ion export across plasma membrane / regulation of ryanodine-sensitive calcium-release channel activity / regulation of cardiac muscle cell action potential / presynaptic endocytosis / Synthesis of IP3 and IP4 in the cytosol / Phase 0 - rapid depolarisation / alpha-actinin binding / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcineurin-mediated signaling / regulation of cell communication by electrical coupling involved in cardiac conduction / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / protein phosphatase activator activity / Long-term potentiation / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / Smooth Muscle Contraction / potassium channel activity / detection of calcium ion / immune system process / regulation of cardiac muscle contraction / catalytic complex / RHO GTPases activate IQGAPs / calcium channel inhibitor activity / presynaptic cytosol / cellular response to interferon-beta / Activation of AMPK downstream of NMDARs / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / Protein methylation / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / titin binding / regulation of calcium-mediated signaling / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / voltage-gated potassium channel complex / FCERI mediated Ca+2 mobilization / potassium ion transmembrane transport / calcium channel complex / substantia nigra development / FCGR3A-mediated IL10 synthesis / regulation of heart rate / establishment of localization in cell / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / Ras activation upon Ca2+ influx through NMDA receptor / calyx of Held / adenylate cyclase activator activity / VEGFR2 mediated cell proliferation / positive regulation of protein secretion / regulation of cytokinesis / VEGFR2 mediated vascular permeability / protein serine/threonine kinase activator activity / spindle microtubule / sarcomere / positive regulation of receptor signaling pathway via JAK-STAT / Translocation of SLC2A4 (GLUT4) to the plasma membrane / calcium channel regulator activity / potassium ion transport / Transcriptional activation of mitochondrial biogenesis / defense response / RAF activation / response to calcium ion 類似検索 - 分子機能 | |||||||||||||||||||||||||||
| 生物種 | Homo sapiens (ヒト) | |||||||||||||||||||||||||||
| 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: 3.4 Å | |||||||||||||||||||||||||||
データ登録者 | Cassell, S.J. / Khoshouei, M. / Wilhelm, W.A. / Whicher, J.R. | |||||||||||||||||||||||||||
| 資金援助 | 1件
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引用 | ジャーナル: Elife / 年: 2025タイトル: Mechanism of SK2 channel gating and its modulation by the bee toxin apamin and small molecules. 著者: Samantha J Cassell / Weiyan Li / Simon Krautwald / Maryam Khoshouei / Yan Tony Lee / Joyce Hou / Wendy Guan / Stefan Peukert / Wilhelm Weihofen / Jonathan R Whicher / ![]() 要旨: Small-conductance calcium-activated potassium channel 2 (SK2) serves a variety of biological functions by coupling intracellular calcium dynamics with membrane potential. SK2 modulators are in ...Small-conductance calcium-activated potassium channel 2 (SK2) serves a variety of biological functions by coupling intracellular calcium dynamics with membrane potential. SK2 modulators are in development for the treatment of neurological and cardiovascular diseases, though the mechanisms of pharmacological modulation remain incompletely understood. We determined structures of an SK2-4 chimeric channel in Ca-bound and Ca-free conformations and in complex with the bee toxin apamin, a small molecule inhibitor, and a small molecule activator. The structures revealed that the S3-S4 linker forms a hydrophobic constriction at the extracellular opening of the pore. Apamin binds to this extracellular constriction and blocks the exit of potassium ions. Furthermore, we identified a structurally related SK2 inhibitor and activator that bind to the transmembrane domains. The compounds exert opposing effects on gating by differentially modulating the conformation of the S6 helices. These results provide important mechanistic insights to facilitate the development of targeted SK2 channel therapeutics. | |||||||||||||||||||||||||||
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 9o51.cif.gz | 321.9 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9o51.ent.gz | 252.8 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9o51.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
| その他 | その他のダウンロード |
-検証レポート
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/o5/9o51 ftp://data.pdbj.org/pub/pdb/validation_reports/o5/9o51 | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 70120MC ![]() 9o48C ![]() 9o52C ![]() 9o53C ![]() 9o5oC C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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| 類似構造データ | 類似検索 - 機能・相同性 F&H 検索 |
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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
| #1: タンパク質 | 分子量: 49382.164 Da / 分子数: 4 断片: SK4 residues 1-15 + SK2 residues 124-412 + SK4 residues 306-428 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: KCNN4, IK1, IKCA1, KCA4, SK4, KCNN2 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: O15554, UniProt: Q9H2S1#2: タンパク質 | 分子量: 16852.545 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: CALM1, CALM, CAM, CAM1 / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P0DP23#3: 化合物 | #4: 化合物 | ChemComp-CA / 研究の焦点であるリガンドがあるか | N | 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 |
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| 由来(天然) |
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| 由来(組換発現) |
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| 緩衝液 | pH: 8 詳細: 20 mM Tris pH 8, 150 mM KCl, 5 mM EGTA, 0.005% GDN, 0.0005% CHS | ||||||||||||||||||||||||
| 試料 | 濃度: 8.25 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||||||||||||||
| 試料支持 | 詳細: UltrAuFoil R 1.2/0.4 200 mesh grids were glow-discharged for 30 seconds at 0.38 mBar with 15 mA using Glocube system グリッドの材料: GOLD / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: UltrAuFoil | ||||||||||||||||||||||||
| 急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 298 K 詳細: 5 uL of sample was applied to grids at 4 degree temperature with 100% humidity. After 30 seconds, grids were blotted for 5 seconds with blot force 25 and plunged into liquid ethane. |
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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: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
| 電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 75000 X / 最大 デフォーカス(公称値): 1600 nm / 最小 デフォーカス(公称値): 800 nm / Cs: 0.01 mm / C2レンズ絞り径: 50 µm |
| 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 | 平均露光時間: 3.25 sec. / 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 撮影したグリッド数: 1 / 実像数: 8928 詳細: Images were collected in EER format with 50 fractions |
| 電子光学装置 | 球面収差補正装置: Microscope has a Cs corrector |
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解析
| EMソフトウェア |
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||
| 粒子像の選択 | 選択した粒子像数: 8200000 | ||||||||||||||||||||||||||||||||||||
| 対称性 | 点対称性: C4 (4回回転対称) | ||||||||||||||||||||||||||||||||||||
| 3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 386845 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | 空間: REAL | ||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | PDB-ID: 9O48 Accession code: 9O48 / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||||||||
| 精密化 | 最高解像度: 3.4 Å 立体化学のターゲット値: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS) | ||||||||||||||||||||||||||||||||||||
| 拘束条件 |
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ムービー
コントローラー
万見について




Homo sapiens (ヒト)
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FIELD EMISSION GUN