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基本情報
登録情報 | データベース: PDB / ID: 8oz0 | ||||||||||||
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タイトル | Structure of a human 48S translation initiation complex with eIF4F and eIF4A | ||||||||||||
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![]() | TRANSLATION / eIF4A / eIF4F / initiation / ribosome / mRNA | ||||||||||||
機能・相同性 | ![]() positive regulation of eukaryotic translation initiation factor 4F complex assembly / : / male germ cell proliferation / eukaryotic initiation factor eIF2 binding / positive regulation of mRNA binding / translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / positive regulation of translation in response to endoplasmic reticulum stress / HRI-mediated signaling ...positive regulation of eukaryotic translation initiation factor 4F complex assembly / : / male germ cell proliferation / eukaryotic initiation factor eIF2 binding / positive regulation of mRNA binding / translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / positive regulation of translation in response to endoplasmic reticulum stress / HRI-mediated signaling / response to kainic acid / macromolecule biosynthetic process / viral translational termination-reinitiation / Cellular response to mitochondrial stress / response to manganese-induced endoplasmic reticulum stress / positive regulation of type B pancreatic cell apoptotic process / eukaryotic translation initiation factor 3 complex, eIF3e / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / cap-dependent translational initiation / negative regulation of translational initiation in response to stress / PERK-mediated unfolded protein response / methionyl-initiator methionine tRNA binding / Activation of the mRNA upon binding of the cap-binding complex and eIFs, and subsequent binding to 43S / eukaryotic translation initiation factor 3 complex, eIF3m / eukaryotic initiation factor 4E binding / PERK regulates gene expression / regulation of cellular response to stress / IRES-dependent viral translational initiation / translation reinitiation / eukaryotic translation initiation factor 2 complex / eukaryotic translation initiation factor 3 complex / nuclear stress granule / RNA cap binding / eukaryotic translation initiation factor 4F complex / formation of cytoplasmic translation initiation complex / cytoplasmic translational initiation / multi-eIF complex / Z-decay: degradation of maternal mRNAs by zygotically expressed factors / regulation of translational initiation in response to stress / translation factor activity, RNA binding / eukaryotic 43S preinitiation complex / mRNA cap binding / formation of translation preinitiation complex / Deadenylation of mRNA / negative regulation of peptidyl-threonine phosphorylation / miRNA-mediated gene silencing by inhibition of translation / eukaryotic 48S preinitiation complex / M-decay: degradation of maternal mRNAs by maternally stored factors / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / negative regulation of endoplasmic reticulum unfolded protein response / negative regulation of peptidyl-serine phosphorylation / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of respiratory burst involved in inflammatory response / positive regulation of gastrulation / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / protein tyrosine kinase inhibitor activity / IRE1-RACK1-PP2A complex / positive regulation of endodeoxyribonuclease activity / nucleolus organization / positive regulation of Golgi to plasma membrane protein transport / translation at postsynapse / TNFR1-mediated ceramide production / negative regulation of DNA repair / negative regulation of RNA splicing / protein-synthesizing GTPase / metal-dependent deubiquitinase activity / mammalian oogenesis stage / regulation of translational initiation / positive regulation of protein localization to cell periphery / supercoiled DNA binding / activation-induced cell death of T cells / neural crest cell differentiation / NF-kappaB complex / oxidized purine DNA binding / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / cysteine-type endopeptidase activator activity involved in apoptotic process / GDP-dissociation inhibitor activity / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / ubiquitin-like protein conjugating enzyme binding / regulation of establishment of cell polarity / translation at presynapse / positive regulation of ubiquitin-protein transferase activity / Formation of the ternary complex, and subsequently, the 43S complex / erythrocyte homeostasis / negative regulation of phagocytosis / rRNA modification in the nucleus and cytosol / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / protein kinase A binding / negative regulation of ubiquitin protein ligase activity / pigmentation / Ribosomal scanning and start codon recognition / ion channel inhibitor activity / Translation initiation complex formation / positive regulation of mitochondrial depolarization / positive regulation of T cell receptor signaling pathway / positive regulation of activated T cell proliferation 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: 3.5 Å | ||||||||||||
![]() | Brito Querido, J. / Sokabe, M. / Diaz-Lopez, I. / Gordiyenko, Y. / Fraser, C.S. / Ramakrishnan, V. | ||||||||||||
資金援助 | ![]() ![]()
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![]() | ![]() タイトル: The structure of a human translation initiation complex reveals two independent roles for the helicase eIF4A. 著者: Jailson Brito Querido / Masaaki Sokabe / Irene Díaz-López / Yuliya Gordiyenko / Christopher S Fraser / V Ramakrishnan / ![]() ![]() 要旨: Eukaryotic translation initiation involves recruitment of the 43S pre-initiation complex to the 5' end of mRNA by the cap-binding complex eIF4F, forming the 48S translation initiation complex (48S), ...Eukaryotic translation initiation involves recruitment of the 43S pre-initiation complex to the 5' end of mRNA by the cap-binding complex eIF4F, forming the 48S translation initiation complex (48S), which then scans along the mRNA until the start codon is recognized. We have previously shown that eIF4F binds near the mRNA exit channel of the 43S, leaving open the question of how mRNA secondary structure is removed as it enters the mRNA channel on the other side of the 40S subunit. Here we report the structure of a human 48S that shows that, in addition to the eIF4A that is part of eIF4F, there is a second eIF4A helicase bound at the mRNA entry site, which could unwind RNA secondary structures as they enter the 48S. The structure also reveals conserved interactions between eIF4F and the 43S, probaby explaining how eIF4F can promote mRNA recruitment in all eukaryotes. | ||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 2.8 MB | 表示 | ![]() |
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PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
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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 | ![]() 17297MC 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
-Eukaryotic translation initiation factor ... , 18種, 18分子 5678ABCDEFGHIJKUx2
#1: タンパク質 | 分子量: 52281.633 Da / 分子数: 1 / 由来タイプ: 組換発現 詳細: Eukaryotic translation initiation factor 3 subunit E 由来: (組換発現) ![]() ![]() |
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#2: タンパク質 | 分子量: 37593.645 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit F 由来: (天然) ![]() |
#3: タンパク質 | 分子量: 35662.016 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit G 由来: (天然) ![]() |
#4: タンパク質 | 分子量: 39979.277 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit H 由来: (天然) ![]() |
#6: タンパク質 | 分子量: 166903.781 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit A 由来: (天然) ![]() |
#7: タンパク質 | 分子量: 25083.619 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit K 由来: (天然) ![]() |
#8: タンパク質 | 分子量: 42555.832 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit M 由来: (天然) ![]() |
#9: タンパク質 | 分子量: 36161.180 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 2 subunit 1 由来: (天然) ![]() |
#10: タンパク質 | 分子量: 51178.406 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 2 subunit 3 由来: (天然) ![]() |
#11: タンパク質 | 分子量: 36543.773 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit I 由来: (天然) ![]() |
#12: タンパク質 | 分子量: 16488.449 Da / 分子数: 1 / 由来タイプ: 組換発現 / 詳細: Eukaryotic translation initiation factor 1A / 由来: (組換発現) ![]() ![]() ![]() |
#13: タンパク質 | 分子量: 49301.750 Da / 分子数: 1 / 由来タイプ: 組換発現 / 詳細: Eukaryotic translation initiation factor 5 / 由来: (組換発現) ![]() ![]() ![]() |
#14: タンパク質 | 分子量: 92593.414 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit B 由来: (天然) ![]() |
#15: タンパク質 | 分子量: 105503.945 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit C 由来: (天然) ![]() |
#16: タンパク質 | 分子量: 66803.734 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit L 由来: (天然) ![]() |
#26: タンパク質 | 分子量: 38454.484 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 2 subunit 2 由来: (天然) ![]() |
#52: タンパク質 | 分子量: 64060.758 Da / 分子数: 1 / 由来タイプ: 天然 詳細: Eukaryotic translation initiation factor 3 subunit D 由来: (天然) ![]() |
#56: タンパク質 | 分子量: 155130.141 Da / 分子数: 1 / 由来タイプ: 組換発現 / 詳細: Eukaryotic translation initiation factor 4 gamma / 由来: (組換発現) ![]() 発現宿主: ![]() 参照: UniProt: Q04637 |
-タンパク質・ペプチド , 1種, 1分子 9
#5: タンパク質・ペプチド | 分子量: 3473.451 Da / 分子数: 1 / 由来タイプ: 天然 / 詳細: 60S ribosomal protein L41 / 由来: (天然) ![]() |
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+40S ribosomal protein ... , 30種, 30分子 LMNOPQRSTVXYZabcdefghijlmoqsvw
-RNA鎖 , 3種, 3分子 Wyz
#28: RNA鎖 | 分子量: 555083.875 Da / 分子数: 1 / 由来タイプ: 天然 / 詳細: 18S rRNA / 由来: (天然) ![]() |
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#53: RNA鎖 | 分子量: 24231.510 Da / 分子数: 1 / 由来タイプ: 合成 / 詳細: Human initiator Met-tRNA-i / 由来: (合成) ![]() |
#54: RNA鎖 | 分子量: 67626.453 Da / 分子数: 1 / 由来タイプ: 合成 / 詳細: mRNA / 由来: (合成) ![]() |
-タンパク質 , 4種, 5分子 knp31
#42: タンパク質 | 分子量: 35115.652 Da / 分子数: 1 / 由来タイプ: 天然 / 詳細: Receptor of activated protein C kinase 1 / 由来: (天然) ![]() |
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#45: タンパク質 | 分子量: 17630.598 Da / 分子数: 1 / 由来タイプ: 天然 / 詳細: Small ribosomal subunit protein uS13 / 由来: (天然) ![]() |
#47: タンパク質 | 分子量: 18004.041 Da / 分子数: 1 / 由来タイプ: 天然 / 詳細: Small ribosomal subunit protein eS31 / 由来: (天然) ![]() |
#55: タンパク質 | 分子量: 46207.824 Da / 分子数: 2 / 由来タイプ: 組換発現 / 詳細: Eukaryotic initiation factor 4A-I / 由来: (組換発現) ![]() ![]() ![]() |
-非ポリマー , 2種, 91分子 


#57: 化合物 | #58: 化合物 | ChemComp-MG / |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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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 | 名称: Human 48S translation initiation complex / タイプ: COMPLEX / Entity ID: #1-#56 / 由来: NATURAL |
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分子量 | 実験値: NO |
由来(天然) | 生物種: ![]() |
緩衝液 | pH: 7.4 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドのタイプ: UltrAuFoil R1.2/1.3 |
急速凍結 | 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277.15 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: OTHER / 最大 デフォーカス(公称値): 3000 nm / 最小 デフォーカス(公称値): 1200 nm |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 電子線照射量: 47.88 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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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: 3.5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 241389 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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