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基本情報
登録情報 | データベース: PDB / ID: 8huj | |||||||||
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タイトル | Cryo-EM structure of the J-K-St region of EMCV IRES in complex with eIF4G-HEAT1 and eIF4A | |||||||||
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![]() | TRANSLATION / Translation initiation factors / RNA binding protein | |||||||||
機能・相同性 | ![]() positive regulation of eukaryotic translation initiation factor 4F complex assembly / positive regulation of mRNA cap binding / positive regulation of translation in response to endoplasmic reticulum stress / cap-dependent translational initiation / macromolecule biosynthetic process / Activation of the mRNA upon binding of the cap-binding complex and eIFs, and subsequent binding to 43S / regulation of cellular response to stress / eukaryotic initiation factor 4E binding / RNA cap binding / eukaryotic translation initiation factor 4F complex ...positive regulation of eukaryotic translation initiation factor 4F complex assembly / positive regulation of mRNA cap binding / positive regulation of translation in response to endoplasmic reticulum stress / cap-dependent translational initiation / macromolecule biosynthetic process / Activation of the mRNA upon binding of the cap-binding complex and eIFs, and subsequent binding to 43S / regulation of cellular response to stress / eukaryotic initiation factor 4E binding / RNA cap binding / eukaryotic translation initiation factor 4F complex / cytoplasmic translational initiation / translation factor activity, RNA binding / Z-decay: degradation of maternal mRNAs by zygotically expressed factors / Deadenylation of mRNA / miRNA-mediated gene silencing by inhibition of translation / M-decay: degradation of maternal mRNAs by maternally stored factors / positive regulation of protein localization to cell periphery / regulation of translational initiation / Ribosomal scanning and start codon recognition / Translation initiation complex formation / negative regulation of peptidyl-threonine phosphorylation / mTORC1-mediated signalling / cellular response to nutrient levels / regulation of presynapse assembly / 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 / behavioral fear response / positive regulation of G1/S transition of mitotic cell cycle / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / energy homeostasis / translation initiation factor binding / translational initiation / positive regulation of protein metabolic process / translation initiation factor activity / positive regulation of neuron differentiation / negative regulation of autophagy / helicase activity / AUF1 (hnRNP D0) binds and destabilizes mRNA / lung development / neuron differentiation / ISG15 antiviral mechanism / Regulation of expression of SLITs and ROBOs / cytoplasmic stress granule / double-stranded RNA binding / positive regulation of peptidyl-serine phosphorylation / positive regulation of cell growth / postsynapse / response to ethanol / molecular adaptor activity / RNA helicase activity / ribosome / RNA helicase / translation / mRNA binding / ATP hydrolysis activity / RNA binding / extracellular exosome / ATP binding / identical protein binding / membrane / nucleus / cytoplasm / cytosol 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: 3.76 Å | |||||||||
![]() | Suzuki, H. / Fujiyoshi, Y. / Imai, S. / Shimada, I. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Dynamically regulated two-site interaction of viral RNA to capture host translation initiation factor. 著者: Shunsuke Imai / Hiroshi Suzuki / Yoshinori Fujiyoshi / Ichio Shimada / ![]() 要旨: Many RNA viruses employ internal ribosome entry sites (IRESs) in their genomic RNA to commandeer the host's translational machinery for replication. The IRES from encephalomyocarditis virus (EMCV) ...Many RNA viruses employ internal ribosome entry sites (IRESs) in their genomic RNA to commandeer the host's translational machinery for replication. The IRES from encephalomyocarditis virus (EMCV) interacts with eukaryotic translation initiation factor 4 G (eIF4G), recruiting the ribosomal subunit for translation. Here, we analyze the three-dimensional structure of the complex composed of EMCV IRES, the HEAT1 domain fragment of eIF4G, and eIF4A, by cryo-electron microscopy. Two distinct eIF4G-interacting domains on the IRES are identified, and complex formation changes the angle therebetween. Further, we explore the dynamics of these domains by using solution NMR spectroscopy, revealing conformational equilibria in the microsecond to millisecond timescale. In the lowly-populated conformations, the base-pairing register of one domain is shifted with the structural transition of the three-way junction, as in the complex structure. Our study provides insights into the viral RNA's sophisticated strategy for optimal docking to hijack the host protein. | |||||||||
履歴 |
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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 | ![]() | 177 KB | 表示 | ![]() |
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PDB形式 | ![]() | 129.3 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.3 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.3 MB | 表示 | |
XML形式データ | ![]() | 32.4 KB | 表示 | |
CIF形式データ | ![]() | 48.1 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 | ![]() 35041MC ![]() 8j7rC 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: 48659.434 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() | ||||
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#2: タンパク質 | 分子量: 31786.811 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() | ||||
#3: RNA鎖 | 分子量: 34838.609 Da / 分子数: 1 / 由来タイプ: 合成 由来: (合成) ![]() 参照: GenBank: NC_001479.1 | ||||
#4: 化合物 | #5: 水 | ChemComp-HOH / | 研究の焦点であるリガンドがあるか | N | |
-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: Ternary complex of the J-K-St region of EMCV IRES with eIF4A and eIF4G-HEAT1 タイプ: COMPLEX / Entity ID: #1-#3 / 由来: RECOMBINANT | ||||||||||||||||||||||||||||||
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分子量 |
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由来(天然) | 生物種: ![]() | ||||||||||||||||||||||||||||||
由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||||||||||||||||||||
緩衝液 | pH: 7.5 | ||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||||||||||||||||||||
試料支持 | グリッドの材料: GOLD / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 277 K |
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電子顕微鏡撮影
顕微鏡 | モデル: JEOL CRYO ARM 300 詳細: The microscope model is the JEOL's "JEM-Z320FHC", the custom-built model equipped with a helium-cooled specimen stage. |
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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): 2500 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 3.4 mm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN |
撮影 | 平均露光時間: 8 sec. / 電子線照射量: 71.1 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) 撮影したグリッド数: 2 / 実像数: 6194 |
電子光学装置 | エネルギーフィルター名称: In-column Omega Filter エネルギーフィルタースリット幅: 20 eV |
画像スキャン | 動画フレーム数/画像: 40 / 利用したフレーム数/画像: 1-40 |
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解析
ソフトウェア | 名称: PHENIX / バージョン: 1.20.1_4487: / 分類: 精密化 | ||||||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 947392 | ||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.76 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 255256 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | 空間: REAL | ||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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