+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-2421 | |||||||||
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タイトル | Molecular architecture of the 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex | |||||||||
マップデータ | Reconstruction of 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex with tRNA in the P/E-site and only density for the G domain and domain II of eIF5B | |||||||||
試料 |
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キーワード | Ribosome initiation complex / initiator factor eiF5B / cryo EM (低温電子顕微鏡法) / single particle analysis (単粒子解析法) | |||||||||
機能・相同性 | 機能・相同性情報 triplex DNA binding / ribosome hibernation / translation elongation factor binding / regulation of translational initiation in response to stress / Platelet degranulation / protein-synthesizing GTPase / formation of cytoplasmic translation initiation complex / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, LSU-rRNA,5S) / eukaryotic 48S preinitiation complex / negative regulation of glucose mediated signaling pathway ...triplex DNA binding / ribosome hibernation / translation elongation factor binding / regulation of translational initiation in response to stress / Platelet degranulation / protein-synthesizing GTPase / formation of cytoplasmic translation initiation complex / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, LSU-rRNA,5S) / eukaryotic 48S preinitiation complex / negative regulation of glucose mediated signaling pathway / negative regulation of translational frameshifting / Protein methylation / RMTs methylate histone arginines / positive regulation of translational fidelity / mTORC1-mediated signalling / ribosome-associated ubiquitin-dependent protein catabolic process / ヒドロキシル化 / GDP-dissociation inhibitor activity / regulation of translational initiation / : / pre-mRNA 5'-splice site binding / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / cleavage in ITS2 between 5.8S rRNA and LSU-rRNA of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Ribosomal scanning and start codon recognition / preribosome, small subunit precursor / translational elongation / response to cycloheximide / telomeric DNA binding / mRNA destabilization / MTOR / Major pathway of rRNA processing in the nucleolus and cytosol / SRP-dependent cotranslational protein targeting to membrane / 90S preribosome / GTP hydrolysis and joining of the 60S ribosomal subunit / Formation of a pool of free 40S subunits / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / negative regulation of mRNA splicing, via spliceosome / protein-RNA complex assembly / ribosomal small subunit export from nucleus / preribosome, large subunit precursor / L13a-mediated translational silencing of Ceruloplasmin expression / translation regulator activity / ribosomal large subunit export from nucleus / G-protein alpha-subunit binding / endonucleolytic cleavage in ITS1 to separate SSU-rRNA from 5.8S rRNA and LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / regulation of translational fidelity / positive regulation of protein kinase activity / rescue of stalled ribosome / translational termination / translation initiation factor binding / maturation of SSU-rRNA / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / translation repressor activity / maturation of LSU-rRNA / ribosomal large subunit biogenesis / translational initiation / DNA-(apurinic or apyrimidinic site) endonuclease activity / cellular response to amino acid starvation / ribosome assembly / translation initiation factor activity / telomere maintenance / small-subunit processome / protein kinase C binding / cytosolic ribosome assembly / maintenance of translational fidelity / modification-dependent protein catabolic process / ribosomal small subunit biogenesis / ribosomal large subunit assembly / small ribosomal subunit rRNA binding / protein tag activity / ribosomal small subunit assembly / rRNA processing / cytoplasmic stress granule / cytosolic small ribosomal subunit / large ribosomal subunit rRNA binding / ribosome binding / リボソーム生合成 / cytoplasmic translation / small ribosomal subunit / 5S rRNA binding / cytosolic large ribosomal subunit / negative regulation of translation / rRNA binding / protein ubiquitination / リボソーム / structural constituent of ribosome / positive regulation of protein phosphorylation / 翻訳 (生物学) / G protein-coupled receptor signaling pathway / negative regulation of gene expression / response to antibiotic / mRNA binding / GTPase activity / ubiquitin protein ligase binding / GTP binding 類似検索 - 分子機能 | |||||||||
生物種 | Saccharomyces cerevisiae (パン酵母) | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / ネガティブ染色法 / 解像度: 4.3 Å | |||||||||
データ登録者 | Fernandez IS / Bai XC / Hussain T / Kelley AC / Lorsch JR / Ramakrishnan V / Scheres SHW | |||||||||
引用 | ジャーナル: Science / 年: 2013 タイトル: Molecular architecture of a eukaryotic translational initiation complex. 著者: Israel S Fernández / Xiao-Chen Bai / Tanweer Hussain / Ann C Kelley / Jon R Lorsch / V Ramakrishnan / Sjors H W Scheres / 要旨: The last step in eukaryotic translational initiation involves the joining of the large and small subunits of the ribosome, with initiator transfer RNA (Met-tRNA(i)(Met)) positioned over the start ...The last step in eukaryotic translational initiation involves the joining of the large and small subunits of the ribosome, with initiator transfer RNA (Met-tRNA(i)(Met)) positioned over the start codon of messenger RNA in the P site. This step is catalyzed by initiation factor eIF5B. We used recent advances in cryo-electron microscopy (cryo-EM) to determine a structure of the eIF5B initiation complex to 6.6 angstrom resolution from <3% of the population, comprising just 5143 particles. The structure reveals conformational changes in eIF5B, initiator tRNA, and the ribosome that provide insights into the role of eIF5B in translational initiation. The relatively high resolution obtained from such a small fraction of a heterogeneous sample suggests a general approach for characterizing the structure of other dynamic or transient biological complexes. | |||||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | EMマップ: SurfViewMolmilJmol/JSmol |
添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_2421.map.gz | 49.4 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-2421-v30.xml emd-2421.xml | 11.2 KB 11.2 KB | 表示 表示 | EMDBヘッダ |
画像 | EMD-2421.jpg | 103.2 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-2421 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-2421 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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「今月の分子」の関連する項目 |
-マップ
ファイル | ダウンロード / ファイル: emd_2421.map.gz / 形式: CCP4 / 大きさ: 51.5 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Reconstruction of 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex with tRNA in the P/E-site and only density for the G domain and domain II of eIF5B | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.77 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
-試料の構成要素
-全体 : 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex ...
全体 | 名称: 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex with tRNA in the P/E-site and only density for the G domain and domain II |
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要素 |
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-超分子 #1000: 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex ...
超分子 | 名称: 80S-eIF5B-Met-itRNAMet Eukaryotic Translation Initiation Complex with tRNA in the P/E-site and only density for the G domain and domain II タイプ: sample / ID: 1000 / Number unique components: 2 |
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分子量 | 実験値: 4.2 MDa / 理論値: 4.2 MDa |
-超分子 #1: 80S-Met-itRNAMet Eukaryotic Translation Initiation Complex
超分子 | 名称: 80S-Met-itRNAMet Eukaryotic Translation Initiation Complex タイプ: complex / ID: 1 / 組換発現: No / Ribosome-details: ribosome-eukaryote: ALL |
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由来(天然) | 生物種: Saccharomyces cerevisiae (パン酵母) / 別称: Baker's Yeast |
分子量 | 実験値: 4.2 MDa / 理論値: 4.2 MDa |
-分子 #1: eIF5B
分子 | 名称: eIF5B / タイプ: protein_or_peptide / ID: 1 / 詳細: Point mutation T439A / 組換発現: Yes |
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由来(天然) | 生物種: Saccharomyces cerevisiae (パン酵母) / 別称: Baker's yeast |
組換発現 | 生物種: Escherichia coli (大腸菌) |
-実験情報
-構造解析
手法 | ネガティブ染色法, クライオ電子顕微鏡法 |
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解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
濃度 | 0.3 mg/mL |
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緩衝液 | pH: 7.2 詳細: 3mM Hepes-KOH, 6.6 mM Tris-acetate pH 7.2, 3 mM NH4Cl, 6.6 mM NH4-acetate, 48 mM K-acetate, 4 mM Mg-acetate, 2.4 mM DTT |
染色 | タイプ: NEGATIVE / 詳細: cryo-EM |
グリッド | 詳細: Quantifoil grids (2/2) with 3 nm thin carbon on top |
凍結 | 凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 90 K / 装置: FEI VITROBOT MARK II / 手法: Blot 2.5 seconds before plunging |
-電子顕微鏡法
顕微鏡 | FEI POLARA 300 |
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電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 倍率(補正後): 79096 / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELDBright-field microscopy / Cs: 2 mm / 最大 デフォーカス(公称値): 3.9 µm / 最小 デフォーカス(公称値): 1.9 µm / 倍率(公称値): 59000 |
試料ステージ | 試料ホルダーモデル: GATAN LIQUID NITROGEN |
温度 | 最低: 80 K / 最高: 90 K / 平均: 85 K |
アライメント法 | Legacy - 非点収差: Objective lens astigmatism was corrected at 59,000 times magnification |
日付 | 2013年1月15日 |
撮影 | カテゴリ: CCD フィルム・検出器のモデル: FEI FALCON I (4k x 4k) デジタル化 - サンプリング間隔: 14 µm / 実像数: 1012 / 平均電子線量: 16 e/Å2 詳細: Every image is the average of 16 frames recorded by the direct electron detector |
実験機器 | モデル: Tecnai Polara / 画像提供: FEI Company |
-画像解析
CTF補正 | 詳細: Each particle |
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最終 再構成 | 想定した対称性 - 点群: C1 (非対称) / 解像度のタイプ: BY AUTHOR / 解像度: 4.3 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: CTFFIND3, RELION 詳細: Use a newly developed statistical movie processing approach to compensate for beam-induced movement. 使用した粒子像数: 40729 |
詳細 | Use a newly developed statistical movie processing approach to compensate for beam-induced movement. Use a newly developed statistical movie processing to compensate for beam-induced movement. |