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基本情報
登録情報 | データベース: PDB / ID: 7uti | ||||||
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タイトル | ALTERNATIVE MODELING OF TROPOMYOSIN IN HUMAN CARDIAC THIN FILAMENT IN THE CALCIUM BOUND STATE | ||||||
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![]() | CONTRACTILE PROTEIN / TROPONIN / TROPOMYOSIN / ACTIN / THIN FILEMENT / MUSCLE / CONTRACTILE | ||||||
機能・相同性 | ![]() positive regulation of heart rate by epinephrine / muscle thin filament tropomyosin / regulation of systemic arterial blood pressure by ischemic conditions / troponin C binding / regulation of muscle filament sliding speed / troponin T binding / diaphragm contraction / cardiac Troponin complex / cardiac myofibril / troponin complex ...positive regulation of heart rate by epinephrine / muscle thin filament tropomyosin / regulation of systemic arterial blood pressure by ischemic conditions / troponin C binding / regulation of muscle filament sliding speed / troponin T binding / diaphragm contraction / cardiac Troponin complex / cardiac myofibril / troponin complex / regulation of ATP-dependent activity / regulation of smooth muscle contraction / regulation of muscle contraction / bleb / muscle filament sliding / transition between fast and slow fiber / ruffle organization / positive regulation of ATP-dependent activity / regulation of cardiac muscle contraction by calcium ion signaling / Striated Muscle Contraction / response to metal ion / negative regulation of ATP-dependent activity / structural constituent of muscle / ventricular cardiac muscle tissue morphogenesis / cytoskeletal motor activator activity / sarcomere organization / regulation of heart contraction / heart contraction / tropomyosin binding / myosin heavy chain binding / troponin I binding / mesenchyme migration / negative regulation of vascular associated smooth muscle cell migration / filamentous actin / negative regulation of vascular associated smooth muscle cell proliferation / actin filament bundle / skeletal muscle contraction / striated muscle thin filament / actin filament bundle assembly / skeletal muscle thin filament assembly / skeletal muscle myofibril / actin monomer binding / Smooth Muscle Contraction / calcium channel inhibitor activity / vasculogenesis / cardiac muscle contraction / stress fiber / Ion homeostasis / skeletal muscle fiber development / titin binding / positive regulation of stress fiber assembly / cytoskeleton organization / cytoskeletal protein binding / actin filament polymerization / positive regulation of cell adhesion / sarcomere / negative regulation of cell migration / actin filament organization / filopodium / actin filament / cellular response to reactive oxygen species / wound healing / 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 / structural constituent of cytoskeleton / ruffle membrane / response to calcium ion / intracellular calcium ion homeostasis / calcium-dependent protein binding / actin filament binding / actin cytoskeleton / lamellipodium / regulation of cell shape / heart development / actin binding / cell body / cytoskeleton / hydrolase activity / protein domain specific binding / protein heterodimerization activity / calcium ion binding / positive regulation of gene expression / protein kinase binding / magnesium ion binding / protein homodimerization activity / ATP binding / identical protein binding / cytosol / cytoplasm 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: 4.8 Å | ||||||
![]() | Rynkiewicz, M.J. / Pavadai, E. / Lehman, W. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Protein-Protein Docking Reveals Dynamic Interactions of Tropomyosin on Actin Filaments. 著者: Elumalai Pavadai / William Lehman / Michael J Rynkiewicz / ![]() 要旨: Experimental approaches such as fiber diffraction and cryo-electron microscopy reconstruction have defined regulatory positions of tropomyosin on actin but have not, as yet, succeeded at determining ...Experimental approaches such as fiber diffraction and cryo-electron microscopy reconstruction have defined regulatory positions of tropomyosin on actin but have not, as yet, succeeded at determining key atomic-level contacts between these proteins or fully substantiated the dynamics of their interactions at a structural level. To overcome this deficiency, we have previously employed computational approaches to deduce global dynamics of thin filament components by energy landscape determination and molecular dynamics simulations. Still, these approaches remain computationally challenging for any complex and large macromolecular assembly like the thin filament. For example, tropomyosin cable wrapping around actin of thin filaments features both head-to-tail polymeric interactions and local twisting, both of which depart from strict superhelical symmetry. This produces a complex energy surface that is difficult to model and thus to evaluate globally. Therefore, at this stage of our understanding, assessing global molecular dynamics can prove to be inherently impractical. As an alternative, we adopted a "divide and conquer" protocol to investigate actin-tropomyosin interactions at an atomistic level. Here, we first employed unbiased protein-protein docking tools to identify binding specificity of individual tropomyosin pseudorepeat segments over the actin surface. Accordingly, tropomyosin "ligand" segments were rotated and translated over potential "target" binding sites on F-actin where the corresponding interaction energetics of billions of conformational poses were ranked by the programs PIPER and ClusPro. These data were used to assess favorable interactions and then to rebuild models of seamless and continuous tropomyosin cables over the F-actin substrate, which were optimized further by flexible fitting routines and molecular dynamics. The models generated azimuthally distinct regulatory positions for tropomyosin cables along thin filaments on actin dominated by stereo-specific head-to-tail overlap linkage. The outcomes are in good agreement with current cryo-electron microscopy topology and consistent with long-thought residue-to-residue interactions between actin and tropomyosin. #1: ![]() タイトル: Cardiac muscle thin filament structures reveal calcium regulatory mechanism. 著者: Yurika Yamada / Keiichi Namba / Takashi Fujii / ![]() 要旨: Contraction of striated muscles is driven by cyclic interactions of myosin head projecting from the thick filament with actin filament and is regulated by Ca released from sarcoplasmic reticulum. ...Contraction of striated muscles is driven by cyclic interactions of myosin head projecting from the thick filament with actin filament and is regulated by Ca released from sarcoplasmic reticulum. Muscle thin filament consists of actin, tropomyosin and troponin, and Ca binding to troponin triggers conformational changes of troponin and tropomyosin to allow actin-myosin interactions. However, the structural changes involved in this regulatory mechanism remain unknown. Here we report the structures of human cardiac muscle thin filament in the absence and presence of Ca by electron cryomicroscopy. Molecular models in the two states built based on available crystal structures reveal the structures of a C-terminal region of troponin I and an N-terminal region of troponin T in complex with the head-to-tail junction of tropomyosin together with the troponin core on actin filament. Structural changes of the thin filament upon Ca binding now reveal the mechanism of Ca regulation of muscle contraction. | ||||||
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構造ビューア | 分子: ![]() ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.6 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.7 MB | 表示 | |
XML形式データ | ![]() | 180.6 KB | 表示 | |
CIF形式データ | ![]() | 255.8 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 0729M ![]() 7utlC 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
-タンパク質 , 5種, 32分子 CDEFGHIJKLMNOPQRefWbijghXYcdVaUZ
#1: タンパク質 | 分子量: 42109.973 Da / 分子数: 16 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() #2: タンパク質 | 分子量: 32789.656 Da / 分子数: 8 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #3: タンパク質 | 分子量: 34659.387 Da / 分子数: 4 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #4: タンパク質 | 分子量: 24058.686 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #5: タンパク質 | 分子量: 18419.482 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
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-非ポリマー , 3種, 38分子 




#6: 化合物 | ChemComp-ADP / #7: 化合物 | ChemComp-MG / #8: 化合物 | ChemComp-CA / |
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-詳細
研究の焦点であるリガンドがあるか | N |
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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: FILAMENT / 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: HUMAN CARDIAC THIN FILAMENT IN THE CALCIUM BOUND STATE タイプ: COMPLEX / Entity ID: #1-#5 / 由来: MULTIPLE SOURCES |
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緩衝液 | pH: 7.5 |
試料 | 濃度: 0.05 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: CARDIAC MUSCLE THIN FILAMENT IN THE CALCIUM BOUND STATE; ACTIN, ALPHA SKELETAL MUSCLE; TROPOMYOSIN, TROPONIN |
試料支持 | グリッドの材料: MOLYBDENUM / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 装置: LEICA EM GP / 凍結剤: ETHANE / 湿度: 80 % |
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電子顕微鏡撮影
顕微鏡 | モデル: JEOL CRYO ARM 200 |
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電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 1800 nm / 最小 デフォーカス(公称値): 700 nm |
撮影 | 電子線照射量: 65 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 実像数: 2880 |
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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 | |||||||||
3次元再構成 | 解像度: 4.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 23374 / 対称性のタイプ: POINT |