+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-7539 | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
タイトル | Cryo-EM structure of the human SK4/calmodulin channel complex in the Ca2+ bound state II | |||||||||
マップデータ | human SK4/calmodulin channel complex in the Ca2+ bound state II: sharpened, filtered map | |||||||||
試料 |
| |||||||||
キーワード | ion channel / neuroscience / calmodulin / MEMBRANE PROTEIN | |||||||||
機能・相同性 | 機能・相同性情報 intermediate conductance calcium-activated potassium channel activity / small conductance calcium-activated potassium channel activity / saliva secretion / Ca2+ activated K+ channels / calcium-activated potassium channel activity / macropinocytosis / stabilization of membrane potential / positive regulation of potassium ion transmembrane transport / regulation of calcium ion import across plasma membrane / cell volume homeostasis ...intermediate conductance calcium-activated potassium channel activity / small conductance calcium-activated potassium channel activity / saliva secretion / Ca2+ activated K+ channels / calcium-activated potassium channel activity / macropinocytosis / stabilization of membrane potential / positive regulation of potassium ion transmembrane transport / regulation of calcium ion import across plasma membrane / cell volume homeostasis / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / phospholipid translocation / Calmodulin induced events / Reduction of cytosolic Ca++ levels / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Activation of Ca-permeable Kainate Receptor / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / PKA activation / negative regulation of high voltage-gated calcium channel activity / CaMK IV-mediated phosphorylation of CREB / Glycogen breakdown (glycogenolysis) / positive regulation of cyclic-nucleotide phosphodiesterase activity / organelle localization by membrane tethering / negative regulation of calcium ion export across plasma membrane / CLEC7A (Dectin-1) induces NFAT activation / autophagosome membrane docking / mitochondrion-endoplasmic reticulum membrane tethering / Activation of RAC1 downstream of NMDARs / regulation of cardiac muscle cell action potential / immune system process / positive regulation of ryanodine-sensitive calcium-release channel activity / positive regulation of T cell receptor signaling pathway / regulation of cell communication by electrical coupling involved in cardiac conduction / Synthesis of IP3 and IP4 in the cytosol / negative regulation of peptidyl-threonine phosphorylation / Negative regulation of NMDA receptor-mediated neuronal transmission / Phase 0 - rapid depolarisation / Unblocking of NMDA receptors, glutamate binding and activation / negative regulation of ryanodine-sensitive calcium-release channel activity / protein phosphatase activator activity / RHO GTPases activate PAKs / Ion transport by P-type ATPases / : / Uptake and function of anthrax toxins / Long-term potentiation / Regulation of MECP2 expression and activity / Calcineurin activates NFAT / catalytic complex / DARPP-32 events / potassium channel activity / detection of calcium ion / regulation of cardiac muscle contraction / Smooth Muscle Contraction / regulation of ryanodine-sensitive calcium-release channel activity / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / calcium channel inhibitor activity / cellular response to interferon-beta / eNOS activation / Protein methylation / voltage-gated potassium channel complex / Activation of AMPK downstream of NMDARs / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / Ion homeostasis / : / titin binding / positive regulation of protein autophosphorylation / regulation of calcium-mediated signaling / sperm midpiece / calcium channel complex / potassium ion transmembrane transport / substantia nigra development / adenylate cyclase activator activity / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / sarcomere / FCERI mediated Ca+2 mobilization / FCGR3A-mediated IL10 synthesis / protein serine/threonine kinase activator activity / VEGFR2 mediated vascular permeability / VEGFR2 mediated cell proliferation / regulation of cytokinesis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / positive regulation of peptidyl-threonine phosphorylation / establishment of localization in cell / spindle microtubule / Translocation of SLC2A4 (GLUT4) to the plasma membrane / positive regulation of protein secretion / positive regulation of receptor signaling pathway via JAK-STAT / RAF activation / Transcriptional activation of mitochondrial biogenesis / positive regulation of protein serine/threonine kinase activity / potassium ion transport / Stimuli-sensing channels / cellular response to type II interferon / defense response 類似検索 - 分子機能 | |||||||||
生物種 | Homo sapiens (ヒト) | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 4.7 Å | |||||||||
データ登録者 | Lee CH / MacKinnon R | |||||||||
資金援助 | 米国, 2件
| |||||||||
引用 | ジャーナル: Science / 年: 2018 タイトル: Activation mechanism of a human SK-calmodulin channel complex elucidated by cryo-EM structures. 著者: Chia-Hsueh Lee / Roderick MacKinnon / 要旨: Small-conductance Ca-activated K (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood ...Small-conductance Ca-activated K (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood cells. Activation of SK channels requires calmodulin (CaM), but how CaM binds and opens SK channels has been unclear. Here we report cryo-electron microscopy (cryo-EM) structures of a human SK4-CaM channel complex in closed and activated states at 3.4- and 3.5-angstrom resolution, respectively. Four CaM molecules bind to one channel tetramer. Each lobe of CaM serves a distinct function: The C-lobe binds to the channel constitutively, whereas the N-lobe interacts with the S4-S5 linker in a Ca-dependent manner. The S4-S5 linker, which contains two distinct helices, undergoes conformational changes upon CaM binding to open the channel pore. These structures reveal the gating mechanism of SK channels and provide a basis for understanding SK channel pharmacology. | |||||||||
履歴 |
|
-構造の表示
ムービー |
ムービービューア |
---|---|
構造ビューア | EMマップ: SurfViewMolmilJmol/JSmol |
添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_7539.map.gz | 96.3 MB | EMDBマップデータ形式 | |
---|---|---|---|---|
ヘッダ (付随情報) | emd-7539-v30.xml emd-7539.xml | 13.8 KB 13.8 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_7539.png | 160.3 KB | ||
Filedesc metadata | emd-7539.cif.gz | 5.3 KB | ||
その他 | emd_7539_additional.map.gz | 49.9 MB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-7539 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-7539 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_7539_validation.pdf.gz | 552 KB | 表示 | EMDB検証レポート |
---|---|---|---|---|
文書・詳細版 | emd_7539_full_validation.pdf.gz | 551.6 KB | 表示 | |
XML形式データ | emd_7539_validation.xml.gz | 6.4 KB | 表示 | |
CIF形式データ | emd_7539_validation.cif.gz | 7.3 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-7539 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-7539 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
---|---|
「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_7539.map.gz / 形式: CCP4 / 大きさ: 103 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
注釈 | human SK4/calmodulin channel complex in the Ca2+ bound state II: sharpened, filtered map | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.03 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
|
-添付データ
-追加マップ: human SK4/calmodulin channel complex in the Ca2+ bound...
ファイル | emd_7539_additional.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
注釈 | human SK4/calmodulin channel complex in the Ca2+ bound state II: unsharpened, filtered map | ||||||||||||
投影像・断面図 |
| ||||||||||||
密度ヒストグラム |
-試料の構成要素
-全体 : human SK4/calmodulin channel complex
全体 | 名称: human SK4/calmodulin channel complex |
---|---|
要素 |
|
-超分子 #1: human SK4/calmodulin channel complex
超分子 | 名称: human SK4/calmodulin channel complex / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2 |
---|---|
由来(天然) | 生物種: Homo sapiens (ヒト) |
-分子 #1: Intermediate conductance calcium-activated potassium channel protein 4
分子 | 名称: Intermediate conductance calcium-activated potassium channel protein 4 タイプ: protein_or_peptide / ID: 1 / コピー数: 4 / 光学異性体: LEVO |
---|---|
由来(天然) | 生物種: Homo sapiens (ヒト) |
分子量 | 理論値: 47.758496 KDa |
組換発現 | 生物種: Homo sapiens (ヒト) |
配列 | 文字列: MGGDLVLGLG ALRRRKRLLE QEKSLAGWAL VLAGTGIGLM VLHAEMLWFG GCSWALYLFL VKCTISISTF LLLCLIVAFH AKEVQLFMT DNGLRDWRVA LTGRQAAQIV LELVVCGLHP APVRGPPCVQ DLGAPLTSPQ PWPGFLGQGE ALLSLAMLLR L YLVPRAVL ...文字列: MGGDLVLGLG ALRRRKRLLE QEKSLAGWAL VLAGTGIGLM VLHAEMLWFG GCSWALYLFL VKCTISISTF LLLCLIVAFH AKEVQLFMT DNGLRDWRVA LTGRQAAQIV LELVVCGLHP APVRGPPCVQ DLGAPLTSPQ PWPGFLGQGE ALLSLAMLLR L YLVPRAVL LRSGVLLNAS YRSIGALNQV RFRHWFVAKL YMNTHPGRLL LGLTLGLWLT TAWVLSVAER QAVNATGHLS DT LWLIPIT FLTIGYGDVV PGTMWGKIVC LCTGVMGVCC TALLVAVVAR KLEFNKAEKH VHNFMMDIQY TKEMKESAAR VLQ EAWMFY KHTRRKESHA ARRHQRKLLA AINAFRQVRL KHRKLREQVN SMVDISKMHM ILYDLQQNLS SSHRALEKQI DTLA GKLDA LTELLSTALG PRQLPEPSQQ SK UniProtKB: Intermediate conductance calcium-activated potassium channel protein 4 |
-分子 #2: Calmodulin-1
分子 | 名称: Calmodulin-1 / タイプ: protein_or_peptide / ID: 2 / コピー数: 4 / 光学異性体: LEVO |
---|---|
由来(天然) | 生物種: Homo sapiens (ヒト) |
分子量 | 理論値: 16.852545 KDa |
組換発現 | 生物種: Homo sapiens (ヒト) |
配列 | 文字列: MADQLTEEQI AEFKEAFSLF DKDGDGTITT KELGTVMRSL GQNPTEAELQ DMINEVDADG NGTIDFPEFL TMMARKMKDT DSEEEIREA FRVFDKDGNG YISAAELRHV MTNLGEKLTD EEVDEMIREA DIDGDGQVNY EEFVQMMTAK UniProtKB: Calmodulin-1 |
-分子 #3: CALCIUM ION
分子 | 名称: CALCIUM ION / タイプ: ligand / ID: 3 / コピー数: 12 / 式: CA |
---|---|
分子量 | 理論値: 40.078 Da |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
---|---|
解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
緩衝液 | pH: 8 |
---|---|
凍結 | 凍結剤: ETHANE |
-電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
---|---|
撮影 | フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 75.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD |
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
-画像解析
初期モデル | モデルのタイプ: OTHER |
---|---|
最終 再構成 | 想定した対称性 - 点群: C4 (4回回転対称) / 解像度のタイプ: BY AUTHOR / 解像度: 4.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 52056 |
初期 角度割当 | タイプ: PROJECTION MATCHING |
最終 角度割当 | タイプ: PROJECTION MATCHING |