+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7l7g | |||||||||
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タイトル | Electron cryo-microscopy of the eukaryotic translation initiation factor 2B from Homo sapiens (updated model of PDB ID: 6CAJ) | |||||||||
要素 | (Translation initiation factor eIF-2B subunit ...) x 5 | |||||||||
キーワード | TRANSLATION / Integrated stress response | |||||||||
機能・相同性 | 機能・相同性情報 eukaryotic translation initiation factor 2B complex / Recycling of eIF2:GDP / cytoplasmic translational initiation / guanyl-nucleotide exchange factor complex / oligodendrocyte development / astrocyte development / astrocyte differentiation / regulation of translational initiation / positive regulation of translational initiation / response to glucose ...eukaryotic translation initiation factor 2B complex / Recycling of eIF2:GDP / cytoplasmic translational initiation / guanyl-nucleotide exchange factor complex / oligodendrocyte development / astrocyte development / astrocyte differentiation / regulation of translational initiation / positive regulation of translational initiation / response to glucose / ovarian follicle development / translation initiation factor binding / response to endoplasmic reticulum stress / myelination / translation initiation factor activity / guanyl-nucleotide exchange factor activity / hippocampus development / central nervous system development / translational initiation / response to peptide hormone / regulation of translation / T cell receptor signaling pathway / response to heat / positive regulation of apoptotic process / GTP binding / ATP binding / identical protein binding / membrane / nucleus / plasma membrane / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | Homo sapiens (ヒト) | |||||||||
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 Å | |||||||||
データ登録者 | Tsai, J.C. / Miller-Vedam, L.E. / Anand, A. / Jaishankar, P. / Nguyen, H.C. / Wang, L. / Renslo, A.R. / Frost, A. / Walter, P. | |||||||||
資金援助 | 米国, 2件
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引用 | ジャーナル: Elife / 年: 2021 タイトル: eIF2B conformation and assembly state regulate the integrated stress response. 著者: Michael Schoof / Morgane Boone / Lan Wang / Rosalie Lawrence / Adam Frost / Peter Walter / 要旨: The integrated stress response (ISR) is activated by phosphorylation of the translation initiation factor eIF2 in response to various stress conditions. Phosphorylated eIF2 (eIF2-P) inhibits eIF2's ...The integrated stress response (ISR) is activated by phosphorylation of the translation initiation factor eIF2 in response to various stress conditions. Phosphorylated eIF2 (eIF2-P) inhibits eIF2's nucleotide exchange factor eIF2B, a twofold symmetric heterodecamer assembled from subcomplexes. Here, we monitor and manipulate eIF2B assembly in vitro and in vivo. In the absence of eIF2B's α-subunit, the ISR is induced because unassembled eIF2B tetramer subcomplexes accumulate in cells. Upon addition of the small-molecule ISR inhibitor ISRIB, eIF2B tetramers assemble into active octamers. Surprisingly, ISRIB inhibits the ISR even in the context of fully assembled eIF2B decamers, revealing allosteric communication between the physically distant eIF2, eIF2-P, and ISRIB binding sites. Cryo-electron microscopy structures suggest a rocking motion in eIF2B that couples these binding sites. eIF2-P binding converts eIF2B decamers into 'conjoined tetramers' with diminished substrate binding and enzymatic activity. Canonical eIF2-P-driven ISR activation thus arises due to this change in eIF2B's conformational state. #1: ジャーナル: Science / 年: 2018 タイトル: Structure of the nucleotide exchange factor eIF2B reveals mechanism of memory-enhancing molecule. 著者: Jordan C Tsai / Lakshmi E Miller-Vedam / Aditya A Anand / Priyadarshini Jaishankar / Henry C Nguyen / Adam R Renslo / Adam Frost / Peter Walter / 要旨: Regulation by the integrated stress response (ISR) converges on the phosphorylation of translation initiation factor eIF2 in response to a variety of stresses. Phosphorylation converts eIF2 from a ...Regulation by the integrated stress response (ISR) converges on the phosphorylation of translation initiation factor eIF2 in response to a variety of stresses. Phosphorylation converts eIF2 from a substrate to a competitive inhibitor of its dedicated guanine nucleotide exchange factor, eIF2B, thereby inhibiting translation. ISRIB, a drug-like eIF2B activator, reverses the effects of eIF2 phosphorylation, and in rodents it enhances cognition and corrects cognitive deficits after brain injury. To determine its mechanism of action, we solved an atomic-resolution structure of ISRIB bound in a deep cleft within decameric human eIF2B by cryo-electron microscopy. Formation of fully active, decameric eIF2B holoenzyme depended on the assembly of two identical tetrameric subcomplexes, and ISRIB promoted this step by cross-bridging a central symmetry interface. Thus, regulation of eIF2B assembly emerges as a rheostat for eIF2B activity that tunes translation during the ISR and that can be further modulated by ISRIB. | |||||||||
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 | 7l7g.cif.gz | 583.2 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7l7g.ent.gz | 455.5 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7l7g.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 | 7l7g_validation.pdf.gz | 1.5 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7l7g_full_validation.pdf.gz | 1.5 MB | 表示 | |
XML形式データ | 7l7g_validation.xml.gz | 93.9 KB | 表示 | |
CIF形式データ | 7l7g_validation.cif.gz | 139.5 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/l7/7l7g ftp://data.pdbj.org/pub/pdb/validation_reports/l7/7l7g | 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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1 |
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-要素
-Translation initiation factor eIF-2B subunit ... , 5種, 10分子 BAJICDFEHG
#1: タンパク質 | 分子量: 80452.586 Da / 分子数: 2 / 変異: I587V / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: EIF2B5, EIF2BE / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: Q13144 #2: タンパク質 | 分子量: 50304.230 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: EIF2B3 / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: Q9NR50 #3: タンパク質 | 分子量: 41008.578 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: EIF2B2, EIF2BB / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: P49770 #4: タンパク質 | 分子量: 57640.168 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: EIF2B4, EIF2BD / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: Q9UI10 #5: タンパク質 | 分子量: 33754.148 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: EIF2B1, EIF2BA / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: Q14232 |
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-非ポリマー , 1種, 1分子
#6: 化合物 | ChemComp-C7B / |
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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 |
-試料調製
構成要素 | 名称: the eukaryotic translation initiation factor 2B from Homo sapiens タイプ: COMPLEX / Entity ID: #1-#5 / 由来: RECOMBINANT |
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分子量 | 値: 0.5 MDa / 実験値: YES |
由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Escherichia coli (大腸菌) |
緩衝液 | pH: 7.5 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 凍結剤: ETHANE |
-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: 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 |
撮影 | 電子線照射量: 80 e/Å2 フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
-解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3次元再構成 | 解像度: 3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 202125 / 対称性のタイプ: POINT |