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基本情報
登録情報 | データベース: EMDB / ID: EMD-5679 | |||||||||
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タイトル | Electron Microscopy of the Aquaporin-0/Calmodulin Complex | |||||||||
![]() | 3D Reconstruction of the Aquaporin-0/Calmodulin Complex | |||||||||
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![]() | aquaporin / calmodulin / calcium regulation / water channel / membrane protein complex / electron microscopy | |||||||||
機能・相同性 | ![]() cell adhesion mediator activity / maintenance of lens transparency / homotypic cell-cell adhesion / gap junction-mediated intercellular transport / water transport / water channel activity / : / : / positive regulation of cyclic-nucleotide phosphodiesterase activity / : ...cell adhesion mediator activity / maintenance of lens transparency / homotypic cell-cell adhesion / gap junction-mediated intercellular transport / water transport / water channel activity / : / : / positive regulation of cyclic-nucleotide phosphodiesterase activity / : / structural constituent of eye lens / establishment of protein localization to mitochondrial membrane / negative regulation of peptidyl-threonine phosphorylation / type 3 metabotropic glutamate receptor binding / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / lens development in camera-type eye / anchoring junction / 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 / positive regulation of DNA binding / PKA activation / CaMK IV-mediated phosphorylation of CREB / negative regulation of high voltage-gated calcium channel activity / response to corticosterone / positive regulation of peptidyl-threonine phosphorylation / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / nitric-oxide synthase binding / negative regulation of calcium ion export across plasma membrane / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / regulation of synaptic vesicle exocytosis / presynaptic endocytosis / regulation of cardiac muscle cell action potential / positive regulation of ryanodine-sensitive calcium-release channel activity / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / Negative regulation of NMDA receptor-mediated neuronal transmission / negative regulation of ryanodine-sensitive calcium-release channel activity / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcineurin-mediated signaling / regulation of synaptic vesicle endocytosis / Ion transport by P-type ATPases / positive regulation of protein autophosphorylation / Uptake and function of anthrax toxins / Long-term potentiation / Calcineurin activates NFAT / protein phosphatase activator activity / Regulation of MECP2 expression and activity / regulation of ryanodine-sensitive calcium-release channel activity / adenylate cyclase binding / DARPP-32 events / Smooth Muscle Contraction / catalytic complex / detection of calcium ion / regulation of cardiac muscle contraction / positive regulation of protein serine/threonine kinase activity / RHO GTPases activate IQGAPs / phosphatidylinositol 3-kinase binding / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / presynaptic cytosol / calcium channel inhibitor activity / cellular response to interferon-beta / Protein methylation / Activation of AMPK downstream of NMDARs / Ion homeostasis / activation of adenylate cyclase activity / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / enzyme regulator activity / regulation of calcium-mediated signaling / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / titin binding / voltage-gated potassium channel complex / sperm midpiece / substantia nigra development / calcium channel complex / visual perception / calyx of Held / nitric-oxide synthase regulator activity / FCERI mediated Ca+2 mobilization / response to amphetamine / positive regulation of nitric-oxide synthase activity / Ras activation upon Ca2+ influx through NMDA receptor / FCGR3A-mediated IL10 synthesis / adenylate cyclase activator activity / regulation of heart rate / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / protein serine/threonine kinase activator activity / VEGFR2 mediated cell proliferation 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() ![]() | |||||||||
手法 | 単粒子再構成法 / ネガティブ染色法 / 解像度: 25.0 Å | |||||||||
![]() | Reichow SL / Clemens DM / Freites JA / Nemeth-Cahalan KL / Heyden M / Tobias DJ / Hall JE / Gonen T | |||||||||
![]() | ![]() タイトル: Allosteric mechanism of water-channel gating by Ca2+-calmodulin. 著者: Steve L Reichow / Daniel M Clemens / J Alfredo Freites / Karin L Németh-Cahalan / Matthias Heyden / Douglas J Tobias / James E Hall / Tamir Gonen / ![]() 要旨: Calmodulin (CaM) is a universal regulatory protein that communicates the presence of calcium to its molecular targets and correspondingly modulates their function. This key signaling protein is ...Calmodulin (CaM) is a universal regulatory protein that communicates the presence of calcium to its molecular targets and correspondingly modulates their function. This key signaling protein is important for controlling the activity of hundreds of membrane channels and transporters. However, understanding of the structural mechanisms driving CaM regulation of full-length membrane proteins has remained elusive. In this study, we determined the pseudoatomic structure of full-length mammalian aquaporin-0 (AQP0, Bos taurus) in complex with CaM, using EM to elucidate how this signaling protein modulates water-channel function. Molecular dynamics and functional mutation studies reveal how CaM binding inhibits AQP0 water permeability by allosterically closing the cytoplasmic gate of AQP0. Our mechanistic model provides new insight, only possible in the context of the fully assembled channel, into how CaM regulates multimeric channels by facilitating cooperativity between adjacent subunits. | |||||||||
履歴 |
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構造の表示
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構造ビューア | EMマップ: ![]() ![]() ![]() |
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ヘッダ (付随情報) | ![]() ![]() | 13.2 KB 13.2 KB | 表示 表示 | ![]() |
画像 | ![]() | 287.7 KB | ||
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | 3D Reconstruction of the Aquaporin-0/Calmodulin Complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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: 3.98 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : Aquaporin-0 bound to Calmodulin
全体 | 名称: Aquaporin-0 bound to Calmodulin |
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要素 |
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-超分子 #1000: Aquaporin-0 bound to Calmodulin
超分子 | 名称: Aquaporin-0 bound to Calmodulin / タイプ: sample / ID: 1000 詳細: Sample was prepared for electron microscopy with negative stain 集合状態: One tetramer of Aquaporin-0 bound to 2 molecules of Calmodulin Number unique components: 2 |
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分子量 | 実験値: 130 KDa / 理論値: 130 KDa / 手法: Size-exclusion Chromatography and SDS-PAGE |
-分子 #1: Aquaporin-0
分子 | 名称: Aquaporin-0 / タイプ: protein_or_peptide / ID: 1 / Name.synonym: AQP0, MIP / 詳細: Crosslinked to Calmodulin using EDC/NHS / コピー数: 4 / 集合状態: tetramer / 組換発現: No / データベース: NCBI |
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由来(天然) | 生物種: ![]() ![]() |
分子量 | 実験値: 25 KDa / 理論値: 25 KDa |
配列 | UniProtKB: Pas12 / InterPro: Major intrinsic protein |
-分子 #2: Calmodulin
分子 | 名称: Calmodulin / タイプ: protein_or_peptide / ID: 2 / Name.synonym: CaM / 詳細: Calmodulin crosslinked to Aquaporin-0 / コピー数: 2 / 集合状態: monomer / 組換発現: Yes |
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由来(天然) | 生物種: ![]() |
分子量 | 実験値: 17 KDa / 理論値: 17 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | UniProtKB: Calmodulin-3 |
-実験情報
-構造解析
手法 | ネガティブ染色法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
濃度 | 0.02 mg/mL |
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緩衝液 | pH: 7.4 / 詳細: 25mM HEPES, 5mM CaCl2, 0.3% decylmaltoside |
染色 | タイプ: NEGATIVE / 詳細: 0.75% uranyl formate |
グリッド | 詳細: 400 mesh carbon coated grid (Ted Pella) |
凍結 | 凍結剤: NONE / 装置: OTHER |
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電子顕微鏡法
顕微鏡 | FEI TECNAI 12 |
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アライメント法 | Legacy - 非点収差: Objective lens astigmatism was corrected at 100,000 times magnification Legacy - Electron beam tilt params: 0 |
日付 | 2010年2月25日 |
撮影 | カテゴリ: FILM / フィルム・検出器のモデル: KODAK SO-163 FILM デジタル化 - スキャナー: NIKON SUPER COOLSCAN 9000 デジタル化 - サンプリング間隔: 6.35 µm / 実像数: 200 / 平均電子線量: 15 e/Å2 / ビット/ピクセル: 16 |
Tilt angle min | 0 |
電子線 | 加速電圧: 120 kV / 電子線源: LAB6 |
電子光学系 | 倍率(補正後): 52000 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / Cs: 2 mm / 最大 デフォーカス(公称値): 2.0 µm / 最小 デフォーカス(公称値): 1.0 µm / 倍率(公称値): 52000 |
試料ステージ | 試料ホルダーモデル: OTHER / Tilt angle max: 50 |
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画像解析
詳細 | Particles were selected from a tilted pair dataset at 0 and 50 degree tilt using SPIDER. An initial reconstruction was generated using random conical tilt methods in SPIDER and refined in FREALIGN |
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CTF補正 | 詳細: CTF-TILT, each micrograph |
最終 再構成 | アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 25.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: SPIDER, FREALIGN 詳細: Final Map with C2 Symmetry and Filtered to 25 Angstrom 使用した粒子像数: 11720 |