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基本情報
登録情報 | データベース: PDB / ID: 3j41 | ||||||
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タイトル | Pseudo-atomic model of the Aquaporin-0/Calmodulin complex derived from electron microscopy | ||||||
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![]() | TRANSPORT PROTEIN/CALCIUM BINDING / calcium regulation / water channel / membrane protein complex / TRANSPORT PROTEIN-CALCIUM BINDING complex | ||||||
機能・相同性 | ![]() maintenance of lens transparency / cell adhesion mediator activity / homotypic cell-cell adhesion / gap junction-mediated intercellular transport / water transport / water channel activity / : / : / positive regulation of cyclic-nucleotide phosphodiesterase activity / positive regulation of ryanodine-sensitive calcium-release channel activity ...maintenance of lens transparency / cell adhesion mediator activity / homotypic cell-cell adhesion / gap junction-mediated intercellular transport / water transport / water channel activity / : / : / positive regulation of cyclic-nucleotide phosphodiesterase activity / positive regulation of ryanodine-sensitive calcium-release channel activity / : / structural constituent of eye lens / positive regulation of protein autophosphorylation / negative regulation of peptidyl-threonine phosphorylation / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / CaM pathway / lens development in camera-type eye / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / positive regulation of peptidyl-threonine phosphorylation / anchoring junction / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / positive regulation of DNA binding / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / CaMK IV-mediated phosphorylation of CREB / PKA activation / negative regulation of high voltage-gated calcium channel activity / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / response to corticosterone / 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 cardiac muscle cell action potential / presynaptic endocytosis / nitric-oxide synthase binding / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / regulation of synaptic vesicle exocytosis / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / regulation of ryanodine-sensitive calcium-release channel activity / Long-term potentiation / protein phosphatase activator activity / Calcineurin activates NFAT / adenylate cyclase binding / Regulation of MECP2 expression and activity / DARPP-32 events / positive regulation of protein serine/threonine kinase activity / catalytic complex / Smooth Muscle Contraction / regulation of synaptic vesicle endocytosis / detection of calcium ion / regulation of cardiac muscle contraction / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / activation of adenylate cyclase activity / cellular response to interferon-beta / Protein methylation / calcium channel inhibitor activity / phosphatidylinositol 3-kinase binding / presynaptic cytosol / Activation of AMPK downstream of NMDARs / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / eNOS activation / positive regulation of nitric-oxide synthase activity / titin binding / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / enzyme regulator activity / sperm midpiece / regulation of calcium-mediated signaling / voltage-gated potassium channel complex / calcium channel complex / visual perception / substantia nigra development / FCERI mediated Ca+2 mobilization / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / FCGR3A-mediated IL10 synthesis / calyx of Held / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / adenylate cyclase activator activity / response to amphetamine / sarcomere / VEGFR2 mediated cell proliferation / regulation of cytokinesis 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 / ネガティブ染色法 / 解像度: 25 Å | ||||||
![]() | Reichow, S.L. / Clemens, D.M. / Freites, J.A. / Nemeth-Cahalan, K.L. / Heyden, M. / Tobias, D.J. / Hall, J.E. / 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. | ||||||
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-関連構造データ
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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: 28244.865 Da / 分子数: 4 / 断片: SEE REMARK 999 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() #2: タンパク質 | 分子量: 16852.545 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() 遺伝子: CALM1, CALM, CAM, CAM1, CALM2, CAM2, CAMB, CALM3, CALML2, CAM3, CAMC, CAMIII プラスミド: pET / 発現宿主: ![]() ![]() #3: 化合物 | ChemComp-CA / 配列の詳細 | CHAINS A, B, C, AND D (AQUAPORIN) ARE FROM OVIS ARIES, BUT THE MODELED SEQUENCE IS FROM BOS TAURUS ...CHAINS A, B, C, AND D (AQUAPORIN) ARE FROM OVIS ARIES, BUT THE MODELED SEQUENCE IS FROM BOS TAURUS (UNP P06624). | |
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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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分子量 | 値: 0.13 MDa / 実験値: YES | ||||||||||||||||||||
緩衝液 | 名称: 25mM HEPES, pH 7.4, 5mM CaCl2, 0.3% decylmaltoside / pH: 7.4 / 詳細: 25mM HEPES, pH 7.4, 5mM CaCl2, 0.3% decylmaltoside | ||||||||||||||||||||
試料 | 濃度: 0.02 mg/ml / 包埋: NO / シャドウイング: NO / 染色: YES / 凍結: NO 詳細: 25mM HEPES, 5mM CaCl2, 0.3% decylmaltoside (Stain Details 0.75% Uranyl Formate) | ||||||||||||||||||||
染色 | タイプ: NEGATIVE / 染色剤: Uranyl Formate | ||||||||||||||||||||
試料支持 | 詳細: 400 mesh carbon coated grid (Ted Pella) |
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電子顕微鏡撮影
顕微鏡 | モデル: FEI TECNAI 12 / 日付: 2010年2月25日 |
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電子銃 | 電子線源: LAB6 / 加速電圧: 120 kV / 照射モード: FLOOD BEAM / Electron beam tilt params: 0 |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 52000 X / 倍率(補正後): 52000 X / 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 / Cs: 2 mm 非点収差: Objective lens astigmatism was corrected at 100,000 times magnification カメラ長: 0 mm |
試料ホルダ | 試料ホルダーモデル: OTHER / 資料ホルダタイプ: FEI Single-Tilt / 傾斜角・最大: 50 ° / 傾斜角・最小: 0 ° |
撮影 | 電子線照射量: 15 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM |
画像スキャン | デジタル画像の数: 200 |
放射 | プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray |
放射波長 | 相対比: 1 |
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解析
EMソフトウェア |
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CTF補正 | 詳細: CTF-TILT, each micrograph | |||||||||||||||
対称性 | 点対称性: C2 (2回回転対称) | |||||||||||||||
3次元再構成 | 手法: Random Conical Tilt / 解像度: 25 Å / 解像度の算出法: FSC 0.5 CUT-OFF / 粒子像の数: 11720 / ピクセルサイズ(公称値): 3.98 Å / ピクセルサイズ(実測値): 3.98 Å / 倍率補正: AQP0 cyrstal 詳細: Final Map with C2 Symmetry and Filtered to 25 Angstrom (Single particle details: Particles were selected from a tilted pair dataset at 0 and 50 degree tilt using SPIDER. An initial ...詳細: Final Map with C2 Symmetry and Filtered to 25 Angstrom (Single particle details: 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.) (Single particle--Applied symmetry: C2) 対称性のタイプ: POINT | |||||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL / Target criteria: cross-correlation 詳細: REFINEMENT PROTOCOL--rigid body DETAILS--A complete model of AQP0-CaM was built by fitting 2B6P and 1NWD into the EM map in Chimera. Loops connecting the two structures were built using COOT ...詳細: REFINEMENT PROTOCOL--rigid body DETAILS--A complete model of AQP0-CaM was built by fitting 2B6P and 1NWD into the EM map in Chimera. Loops connecting the two structures were built using COOT and the final model was energy minimized to remove steric clashes. The geometries of the modeled loops (AQP0 residues 222-227) were not refined due to lack of resolution in the experimental map. | |||||||||||||||
原子モデル構築 | 3D fitting-ID: 1 / Source name: PDB / タイプ: experimental model
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精密化ステップ | サイクル: LAST
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