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基本情報
登録情報 | データベース: PDB / ID: 8oh4 | |||||||||
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タイトル | Subtomogram averaging structure of cofilactin filament inside microtubule lumen of Drosophila S2 cell protrusion. | |||||||||
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![]() | CONTRACTILE PROTEIN / Cytoskeleton / Filament / Actin / Cofilactin | |||||||||
機能・相同性 | ![]() establishment of imaginal disc-derived wing hair orientation / establishment of ommatidial planar polarity / imaginal disc-derived leg segmentation / meiotic cytokinesis / Gap junction degradation / Formation of annular gap junctions / EPHB-mediated forward signaling / EPH-ephrin mediated repulsion of cells / Cell-extracellular matrix interactions / RHOBTB2 GTPase cycle ...establishment of imaginal disc-derived wing hair orientation / establishment of ommatidial planar polarity / imaginal disc-derived leg segmentation / meiotic cytokinesis / Gap junction degradation / Formation of annular gap junctions / EPHB-mediated forward signaling / EPH-ephrin mediated repulsion of cells / Cell-extracellular matrix interactions / RHOBTB2 GTPase cycle / RHOF GTPase cycle / VEGFA-VEGFR2 Pathway / ovarian fusome organization / Platelet degranulation / MAP2K and MAPK activation / RHO GTPases Activate WASPs and WAVEs / Regulation of actin dynamics for phagocytic cup formation / compound eye morphogenesis / DNA Damage Recognition in GG-NER / mushroom body development / rhabdomere development / actin filament fragmentation / actomyosin contractile ring assembly / Clathrin-mediated endocytosis / border follicle cell migration / compound eye development / sperm individualization / centrosome separation / UCH proteinases / establishment of planar polarity / epithelial structure maintenance / maintenance of protein location in cell / brahma complex / actin filament severing / actin filament depolymerization / Ino80 complex / tube formation / regulation of lamellipodium assembly / lamellipodium assembly / female gonad development / mitotic cytokinesis / actin filament polymerization / axonogenesis / actin filament organization / positive regulation of protein secretion / 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 / nuclear matrix / actin filament binding / actin cytoskeleton / actin binding / hydrolase activity / chromatin remodeling / nucleoplasm / ATP binding / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() | |||||||||
手法 | 電子顕微鏡法 / サブトモグラム平均法 / クライオ電子顕微鏡法 / 解像度: 16.5 Å | |||||||||
![]() | Ventura Santos, C. / Carter, A.P. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: CryoET shows cofilactin filaments inside the microtubule lumen. 著者: Camilla Ventura Santos / Stephen L Rogers / Andrew P Carter / ![]() 要旨: Cytoplasmic microtubules are tubular polymers that can harbor small proteins or filaments inside their lumen. The identity of these objects and what causes their accumulation has not been ...Cytoplasmic microtubules are tubular polymers that can harbor small proteins or filaments inside their lumen. The identity of these objects and what causes their accumulation has not been conclusively established. Here, we used cryogenic electron tomography (cryoET) of S2 cell protrusions and found filaments inside the microtubule lumen, which resemble those reported recently in human HAP1 cells. The frequency of these filaments increased upon inhibition of the sarco/endoplasmic reticulum Ca ATPase (SERCA) with the small-molecule drug thapsigargin. Subtomogram averaging showed that the luminal filaments adopt a helical structure reminiscent of cofilin-bound actin (cofilactin). Consistent with this, cofilin was activated in cells under the same conditions that increased luminal filament occurrence. Furthermore, RNAi knock-down of cofilin reduced the frequency of luminal filaments with cofilactin morphology. These results suggest that cofilin activation stimulates its accumulation on actin filaments inside the microtubule lumen. | |||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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PDBx/mmCIF形式 | ![]() | 458.6 KB | 表示 | ![]() |
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PDB形式 | ![]() | 302.8 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 16877MC 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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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: 41160.980 Da / 分子数: 8 変異: 6 N-terminal residues (MCDEEV) were removed. Residues 42-50 (QGVMVGMGC) were removed 由来タイプ: 天然 / 由来: (天然) ![]() ![]() 参照: UniProt: P10987, 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 #2: タンパク質 | 分子量: 17180.529 Da / 分子数: 6 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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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: サブトモグラム平均法 |
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試料調製
構成要素 | 名称: Cofilactin filament inside the microtubule lumen of induced Drosophila S2 cell protrusion タイプ: CELL / Entity ID: all / 由来: NATURAL |
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由来(天然) | 生物種: ![]() ![]() |
緩衝液 | pH: 7 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: Quantifoil R3.5/1 Au200 grids were glow discharged for 30s at 20 - 30 mA and subsequently coated with 0.25 ug/mL Concanavalin Aater for 1 - 16 h at 37 degrees Celcius. 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: Quantifoil R3.5/1 |
急速凍結 | 装置: FEI VITROBOT MARK III / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 198.15 K |
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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: FEI TITAN KRIOS |
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): 6000 nm / 最小 デフォーカス(公称値): 2500 nm |
撮影 | 電子線照射量: 3 e/Å2 / Avg electron dose per subtomogram: 120 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) 詳細: Data was collected on Gatan K2 summit (2.952 A/pixel) and Gatan K3 summit (2.659 A/pixel) with 3 degree increments (3 e/A2 dose per tilt). The total dose was between 118 and 122 e/A2. |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 20 eV |
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解析
EMソフトウェア |
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CTF補正 | 詳細: CTF estimation was performed in WARP. CTF correction was performed in Relion 3.1. タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||
3次元再構成 | 解像度: 16.5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 3801 詳細: helical symmetry (-162 twist, 29A rise) was applied during 3D classification but not during refinements. 対称性のタイプ: POINT | ||||||||||||||||
EM volume selection | Num. of tomograms: 58 / Num. of volumes extracted: 7549 | ||||||||||||||||
原子モデル構築 | 詳細: Drosophila cofilin and actin structures were predicted as a complex with Alphafold 2-Multimer. Actin from the predicted cofilin-actin complex was iteratively aligned with 8 actin subunits in ...詳細: Drosophila cofilin and actin structures were predicted as a complex with Alphafold 2-Multimer. Actin from the predicted cofilin-actin complex was iteratively aligned with 8 actin subunits in the chicken cofilactin PDB model 5yU8. Two cofilin moieties at the pointed end were removed. Side chains were truncated. The model was not refined. |