+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6i3m | |||||||||||||||
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タイトル | eIF2B:eIF2 complex, phosphorylated on eIF2 alpha serine 52. | |||||||||||||||
要素 |
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キーワード | TRANSLATION / Translational control eIF2 phosphorylation Integrated stress response eIF2B TRANSLATION | |||||||||||||||
機能・相同性 | 機能・相同性情報 negative regulation of cellular response to amino acid starvation / positive regulation of cellular response to heat / Recycling of eIF2:GDP / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 2B complex / ABC-family proteins mediated transport / methionyl-initiator methionine tRNA binding / eukaryotic translation initiation factor 2 complex / multi-eIF complex / cytoplasmic translational initiation ...negative regulation of cellular response to amino acid starvation / positive regulation of cellular response to heat / Recycling of eIF2:GDP / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 2B complex / ABC-family proteins mediated transport / methionyl-initiator methionine tRNA binding / eukaryotic translation initiation factor 2 complex / multi-eIF complex / cytoplasmic translational initiation / protein-synthesizing GTPase / eukaryotic 43S preinitiation complex / guanyl-nucleotide exchange factor complex / formation of translation preinitiation complex / positive regulation of cellular response to amino acid starvation / eukaryotic 48S preinitiation complex / positive regulation of translational fidelity / regulation of translational initiation / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition / L13a-mediated translational silencing of Ceruloplasmin expression / positive regulation of translational initiation / enzyme regulator activity / translation initiation factor binding / translation initiation factor activity / guanyl-nucleotide exchange factor activity / translational initiation / cytoplasmic stress granule / ribosome binding / ribosome / GTPase activity / mRNA binding / GTP binding / mitochondrion / RNA binding / metal ion binding / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||||||||
生物種 | Saccharomyces cerevisiae S288C (パン酵母) | |||||||||||||||
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: 3.93 Å | |||||||||||||||
データ登録者 | Adomavicius, T. / Roseman, A.M. / Pavitt, G.D. | |||||||||||||||
資金援助 | 英国, 4件
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引用 | ジャーナル: Nat Commun / 年: 2019 タイトル: The structural basis of translational control by eIF2 phosphorylation. 著者: Tomas Adomavicius / Margherita Guaita / Yu Zhou / Martin D Jennings / Zakia Latif / Alan M Roseman / Graham D Pavitt / 要旨: Protein synthesis in eukaryotes is controlled by signals and stresses via a common pathway, called the integrated stress response (ISR). Phosphorylation of the translation initiation factor eIF2 ...Protein synthesis in eukaryotes is controlled by signals and stresses via a common pathway, called the integrated stress response (ISR). Phosphorylation of the translation initiation factor eIF2 alpha at a conserved serine residue mediates translational control at the ISR core. To provide insight into the mechanism of translational control we have determined the structures of eIF2 both in phosphorylated and unphosphorylated forms bound with its nucleotide exchange factor eIF2B by electron cryomicroscopy. The structures reveal that eIF2 undergoes large rearrangements to promote binding of eIF2α to the regulatory core of eIF2B comprised of the eIF2B alpha, beta and delta subunits. Only minor differences are observed between eIF2 and eIF2αP binding to eIF2B, suggesting that the higher affinity of eIF2αP for eIF2B drives translational control. We present a model for controlled nucleotide exchange and initiator tRNA binding to the eIF2/eIF2B complex. #1: ジャーナル: Elife / 年: 2017 タイトル: Fail-safe control of translation initiation by dissociation of eIF2α phosphorylated ternary complexes. 著者: Martin D Jennings / Christopher J Kershaw / Tomas Adomavicius / Graham D Pavitt / 要旨: Phosphorylation of eIF2α controls translation initiation by restricting the levels of active eIF2-GTP/Met-tRNAi ternary complexes (TC). This modulates the expression of all eukaryotic mRNAs and ...Phosphorylation of eIF2α controls translation initiation by restricting the levels of active eIF2-GTP/Met-tRNAi ternary complexes (TC). This modulates the expression of all eukaryotic mRNAs and contributes to the cellular integrated stress response. Key to controlling the activity of eIF2 are translation factors eIF2B and eIF5, thought to primarily function with eIF2-GDP and TC respectively. Using a steady-state kinetics approach with purified proteins we demonstrate that eIF2B binds to eIF2 with equal affinity irrespective of the presence or absence of competing guanine nucleotides. We show that eIF2B can compete with Met-tRNAi for eIF2-GTP and can destabilize TC. When TC is formed with unphosphorylated eIF2, eIF5 can out-compete eIF2B to stabilize TC/eIF5 complexes. However when TC/eIF5 is formed with phosphorylated eIF2, eIF2B outcompetes eIF5 and destabilizes TC. These data uncover competition between eIF2B and eIF5 for TC and identify that phosphorylated eIF2-GTP translation initiation intermediate complexes can be inhibited by eIF2B. | |||||||||||||||
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 | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 6i3m.cif.gz | 841.5 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6i3m.ent.gz | 680 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 6i3m.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 6i3m_validation.pdf.gz | 1.3 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 6i3m_full_validation.pdf.gz | 1.3 MB | 表示 | |
XML形式データ | 6i3m_validation.xml.gz | 129.6 KB | 表示 | |
CIF形式データ | 6i3m_validation.cif.gz | 197.4 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/i3/6i3m ftp://data.pdbj.org/pub/pdb/validation_reports/i3/6i3m | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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-要素
-Translation initiation factor eIF-2B subunit ... , 5種, 10分子 ABCDEFGHIJ
#1: タンパク質 | 分子量: 34062.027 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: GCN3, AAS2, TIF221, YKR026C / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P14741 #2: タンパク質 | 分子量: 70945.195 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: GCD2, TIF224, YGR083C / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P12754 #3: タンパク質 | 分子量: 42621.441 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: GCD7, TIF222, YLR291C, L8003.17 / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P32502 #4: タンパク質 | 分子量: 81249.062 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: GCD6, TIF225, YDR211W, YD8142.12, YD8142B.03 / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P32501 #5: タンパク質 | 分子量: 65768.320 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: GCD1, TIF223, TRA3, YOR260W / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P09032 |
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-Eukaryotic translation initiation factor 2 subunit ... , 3種, 6分子 KLMNOP
#6: タンパク質 | 分子量: 34843.633 Da / 分子数: 2 / Mutation: serine 52 to SEP / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: SUI2, TIF211, YJR007W, J1429 / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P20459 #7: タンパク質 | 分子量: 31631.309 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: SUI3, TIF212, YPL237W / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P09064 #8: タンパク質 | 分子量: 57942.699 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) Saccharomyces cerevisiae S288C (パン酵母) 遺伝子: GCD11, TIF213, YER025W / 発現宿主: Saccharomyces cerevisiae (パン酵母) / 参照: UniProt: P32481 |
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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 |
-試料調製
構成要素 | 名称: Complex of translation initiation factors eIF2 and eIF2B タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT | ||||||||||||||||||||
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分子量 | 値: 0.838 MDa / 実験値: YES | ||||||||||||||||||||
由来(天然) | 生物種: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (パン酵母) | ||||||||||||||||||||
由来(組換発現) | 生物種: Saccharomyces cerevisiae (パン酵母) | ||||||||||||||||||||
緩衝液 | pH: 7.5 詳細: Solutions for sample preparation were made fresh, filter sterilized, and degassed. | ||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.25 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||||||||||
試料支持 | 詳細: Ultra-thin carbon support film, 3nm - on lacey carbon grids from Agar Scientific were used for 35 degree tilted data collection. For zero tilt data collection, 200 mesh Au Quantifoil, R2/2 grids were used. グリッドの材料: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: Homemade | ||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK III / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 294 K / 詳細: Blot for 2 seconds before plunging |
-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 / 詳細: Tilt at zero and 35 degrees. |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / 倍率(補正後): 37313 X / 最大 デフォーカス(公称値): 4000 nm / 最小 デフォーカス(公称値): 1500 nm / Calibrated defocus min: 1000 nm / 最大 デフォーカス(補正後): 5500 nm / Cs: 2.7 mm / アライメント法: BASIC |
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 | 平均露光時間: 12 sec. / 電子線照射量: 40 e/Å2 / 検出モード: COUNTING フィルム・検出器のモデル: GATAN K2 QUANTUM (4k x 4k) 撮影したグリッド数: 2 / 実像数: 4533 詳細: 2 separate data collections for zero degree (2255 images) and tilted (2278 images) specimen. Both on Titan Krios |
電子光学装置 | エネルギーフィルター名称: GIF Quantum LS / エネルギーフィルタースリット幅: 20 eV |
画像スキャン | サンプリングサイズ: 5 µm / 横: 3838 / 縦: 3710 / 動画フレーム数/画像: 48 / 利用したフレーム数/画像: 2-48 |
-解析
EMソフトウェア |
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CTF補正 | 詳細: CTF determination was performed per micrograph initially. After particle picking and initial reconstruction, per particle CTF determination was performed. タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 655000 詳細: Initially, approximately 3000 particles were picked manually and used for 2D classification. Then 4 best looking 2D class average images were used as references for automated particle picking ...詳細: Initially, approximately 3000 particles were picked manually and used for 2D classification. Then 4 best looking 2D class average images were used as references for automated particle picking in RELION. For the zero tilt data collection, 406000 particles were picked. For the 35 degree tilt data collection, 249000 particles were picked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C2 (2回回転対称) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.93 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 64541 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 |
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原子モデル構築 |
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