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基本情報
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タイトル | Structure of human eIF3 core from closed 48S translation initiation complex | |||||||||
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![]() | RIBOSOME / TRANSLATION / initiation / 48S / eIF / human / eukaryotic / factor / codon / scanning / open / reading | |||||||||
機能・相同性 | ![]() positive regulation of mRNA binding / viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3e / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / translation reinitiation / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / cytoplasmic translational initiation ...positive regulation of mRNA binding / viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3e / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / translation reinitiation / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / cytoplasmic translational initiation / multi-eIF complex / eukaryotic 43S preinitiation complex / mRNA cap binding / eukaryotic 48S preinitiation complex / negative regulation of RNA splicing / metal-dependent deubiquitinase activity / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / regulation of translational initiation / rRNA modification in the nucleus and cytosol / Formation of the ternary complex, and subsequently, the 43S complex / erythrocyte homeostasis / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / Ribosomal scanning and start codon recognition / Translation initiation complex formation / SARS-CoV-1 modulates host translation machinery / Peptide chain elongation / Selenocysteine synthesis / Formation of a pool of free 40S subunits / Eukaryotic Translation Termination / Response of EIF2AK4 (GCN2) to amino acid deficiency / SRP-dependent cotranslational protein targeting to membrane / Viral mRNA Translation / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / Major pathway of rRNA processing in the nucleolus and cytosol / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / laminin binding / translation regulator activity / translation initiation factor binding / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / negative regulation of translational initiation / negative regulation of proteasomal ubiquitin-dependent protein catabolic process / translation initiation factor activity / Mitotic Prometaphase / antiviral innate immune response / EML4 and NUDC in mitotic spindle formation / cytosolic ribosome / Resolution of Sister Chromatid Cohesion / positive regulation of translation / erythrocyte differentiation / maturation of SSU-rRNA / translational initiation / small-subunit processome / RHO GTPases Activate Formins / PML body / GABA-ergic synapse / mRNA 5'-UTR binding / Regulation of expression of SLITs and ROBOs / fibrillar center / metallopeptidase activity / rRNA processing / Separation of Sister Chromatids / ribosome biogenesis / presynapse / ribosome binding / virus receptor activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / SARS-CoV-2 modulates host translation machinery / ubiquitinyl hydrolase 1 / cysteine-type deubiquitinase activity / cytoplasmic translation / cell differentiation / postsynaptic density / structural constituent of ribosome / ribosome / cadherin binding / translation / ribonucleoprotein complex / focal adhesion / mRNA binding / synapse / negative regulation of apoptotic process / chromatin / nucleolus / glutamatergic synapse / structural molecule activity / endoplasmic reticulum / negative regulation of transcription by RNA polymerase II / proteolysis / DNA binding / RNA binding / extracellular exosome / zinc ion binding / nucleoplasm 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.4 Å | |||||||||
![]() | Petrychenko V / Yi S-H / Liedtke D / Peng BZ / Rodnina MV / Fischer N | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural basis for translational control by the human 48S initiation complex. 著者: Valentyn Petrychenko / Sung-Hui Yi / David Liedtke / Bee-Zen Peng / Marina V Rodnina / Niels Fischer / ![]() 要旨: The selection of an open reading frame (ORF) for translation of eukaryotic mRNA relies on remodeling of the scanning 48S initiation complex into an elongation-ready 80S ribosome. Using cryo-electron ...The selection of an open reading frame (ORF) for translation of eukaryotic mRNA relies on remodeling of the scanning 48S initiation complex into an elongation-ready 80S ribosome. Using cryo-electron microscopy, we visualize the key commitment steps orchestrating 48S remodeling in humans. The mRNA Kozak sequence facilitates mRNA scanning in the 48S open state and stabilizes the 48S closed state by organizing the contacts of eukaryotic initiation factors (eIFs) and ribosomal proteins and by reconfiguring mRNA structure. GTPase-triggered large-scale fluctuations of 48S-bound eIF2 facilitate eIF5B recruitment, transfer of initiator tRNA from eIF2 to eIF5B and the release of eIF5 and eIF2. The 48S-bound multisubunit eIF3 complex controls ribosomal subunit joining by coupling eIF exchange to gradual displacement of the eIF3c N-terminal domain from the intersubunit interface. These findings reveal the structural mechanism of ORF selection in human cells and explain how eIF3 could function in the context of the 80S ribosome. | |||||||||
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構造の表示
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マップデータ | ![]() | 47.8 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 47.9 KB 47.9 KB | 表示 表示 | ![]() |
FSC (解像度算出) | ![]() | 8.5 KB | 表示 | ![]() |
画像 | ![]() | 206.8 KB | ||
マスクデータ | ![]() | 52.7 MB | ![]() | |
Filedesc metadata | ![]() | 13.3 KB | ||
その他 | ![]() ![]() ![]() ![]() | 49.4 MB 40.6 MB 40.7 MB 40.7 MB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-検証レポート
文書・要旨 | ![]() | 846.4 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 845.9 KB | 表示 | |
XML形式データ | ![]() | 14.5 KB | 表示 | |
CIF形式データ | ![]() | 20.6 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 | ![]() 8rg0MC ![]() 8pj1C ![]() 8pj2C ![]() 8pj3C ![]() 8pj4C ![]() 8pj5C ![]() 8pj6C M: このマップから作成された原子モデル 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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「今月の分子」の関連する項目 |
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マップ
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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: 1.16 Å | ||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
-マスク #1
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密度ヒストグラム |
-追加マップ: Map from focused flexible refinement with improved density...
ファイル | emd_19128_additional_1.map | ||||||||||||
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注釈 | Map from focused flexible refinement with improved density for eIF3k/l | ||||||||||||
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密度ヒストグラム |
-追加マップ: Unsharpened main map from 3D refinement step
ファイル | emd_19128_additional_2.map | ||||||||||||
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注釈 | Unsharpened main map from 3D refinement step | ||||||||||||
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密度ヒストグラム |
-ハーフマップ: #2
ファイル | emd_19128_half_map_1.map | ||||||||||||
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密度ヒストグラム |
-ハーフマップ: #1
ファイル | emd_19128_half_map_2.map | ||||||||||||
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密度ヒストグラム |
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試料の構成要素
+全体 : Human 48S initiation complex 40S-eIF1-eIF1A-eIF2-eIF3-tRNA-Met-mRNA
+超分子 #1: Human 48S initiation complex 40S-eIF1-eIF1A-eIF2-eIF3-tRNA-Met-mRNA
+超分子 #2: Human 48S initiation complex 40S-eIF1-eIF1A-eIF2-eIF3-tRNA-Met
+超分子 #3: mRNA
+分子 #1: Eukaryotic translation initiation factor 3 subunit K
+分子 #2: Eukaryotic translation initiation factor 3 subunit F
+分子 #3: Eukaryotic translation initiation factor 3 subunit L
+分子 #4: Eukaryotic translation initiation factor 3 subunit M
+分子 #6: Eukaryotic translation initiation factor 3 subunit H
+分子 #8: 40S ribosomal protein S27
+分子 #9: 40S ribosomal protein S13
+分子 #10: 40S ribosomal protein S17
+分子 #11: 40S ribosomal protein SA
+分子 #12: 40S ribosomal protein S3a
+分子 #13: 40S ribosomal protein S14
+分子 #14: 40S ribosomal protein S26
+分子 #15: 40S ribosomal protein S28
+分子 #16: Eukaryotic translation initiation factor 3 subunit A
+分子 #17: Eukaryotic translation initiation factor 3 subunit E
+分子 #18: Eukaryotic translation initiation factor 3 subunit D
+分子 #19: Eukaryotic translation initiation factor 3 subunit C
+分子 #5: mRNA
+分子 #7: 18S rRNA
+分子 #20: MAGNESIUM ION
+分子 #21: ZINC ION
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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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
緩衝液 | pH: 7.5 構成要素:
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凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: HOMEMADE PLUNGER / 詳細: Manual blotting & plunge-freezing. |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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特殊光学系 | 球面収差補正装置: Electron-optical aberrations were corrected using a CETCOR Cs-corrector (CEOS, Heidelberg) aligned with the CETCORPLUS 4.6.9 software package (CEOS, Heidelberg). |
撮影 | フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 検出モード: INTEGRATING / 平均露光時間: 1.5 sec. / 平均電子線量: 45.0 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: SPOT SCAN / 撮影モード: BRIGHT FIELD / Cs: 0.01 mm / 最大 デフォーカス(公称値): 2.5 µm / 最小 デフォーカス(公称値): 0.2 µm / 倍率(公称値): 59000 |
試料ステージ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER ホルダー冷却材: NITROGEN |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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画像解析
-原子モデル構築 1
精密化 | 空間: REAL |
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得られたモデル | ![]() PDB-8rg0: |