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Open data
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Basic information
Entry | Database: PDB / ID: 8tqo | |||||||||
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Title | Eukaryotic translation initiation factor 2B tetramer | |||||||||
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![]() | TRANSLATION / Protein translation / eIF2B / integrated stress response | |||||||||
Function / homology | ![]() eukaryotic translation initiation factor 2B complex / Recycling of eIF2:GDP / cytoplasmic translational initiation / oligodendrocyte development / guanyl-nucleotide exchange factor complex / 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 / oligodendrocyte development / guanyl-nucleotide exchange factor complex / astrocyte development / astrocyte differentiation / regulation of translational initiation / positive regulation of translational initiation / response to glucose / ovarian follicle development / translation initiation factor binding / translational initiation / translation initiation factor activity / myelination / response to endoplasmic reticulum stress / guanyl-nucleotide exchange factor activity / central nervous system development / hippocampus development / response to peptide hormone / regulation of translation / T cell receptor signaling pathway / response to heat / positive regulation of apoptotic process / GTP binding / ATP binding / nucleus / cytoplasm / cytosol Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
![]() | Wang, L. / Lawrence, R. / Sangwan, S. / Anand, A. / Shoemaker, S. / Deal, A. / Marqusee, S. / Watler, P. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: A helical fulcrum in eIF2B coordinates allosteric regulation of stress signaling. Authors: Rosalie E Lawrence / Sophie R Shoemaker / Aniliese Deal / Smriti Sangwan / Aditya A Anand / Lan Wang / Susan Marqusee / Peter Walter / ![]() ![]() Abstract: The integrated stress response (ISR) enables cells to survive a variety of acute stresses, but chronic activation of the ISR underlies age-related diseases. ISR signaling downregulates translation ...The integrated stress response (ISR) enables cells to survive a variety of acute stresses, but chronic activation of the ISR underlies age-related diseases. ISR signaling downregulates translation and activates expression of stress-responsive factors that promote return to homeostasis and is initiated by inhibition of the decameric guanine nucleotide exchange factor eIF2B. Conformational and assembly transitions regulate eIF2B activity, but the allosteric mechanisms controlling these dynamic transitions and mediating the therapeutic effects of the small-molecule ISR inhibitor ISRIB are unknown. Using hydrogen-deuterium exchange-mass spectrometry and cryo-electron microscopy, we identified a central α-helix whose orientation allosterically coordinates eIF2B conformation and assembly. Biochemical and cellular signaling assays show that this 'switch-helix' controls eIF2B activity and signaling. In sum, the switch-helix acts as a fulcrum of eIF2B conformational regulation and is a highly conserved actuator of ISR signal transduction. This work uncovers a conserved allosteric mechanism and unlocks new therapeutic possibilities for ISR-linked diseases. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 298.7 KB | Display | ![]() |
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PDB format | ![]() | 228.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.4 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 47.5 KB | Display | |
Data in CIF | ![]() | 70.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 41510MC ![]() 8tqzC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 80452.586 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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#2: Protein | Mass: 50304.230 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#3: Protein | Mass: 41008.578 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#4: Protein | Mass: 57640.168 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Translation initiation factor 2B decamer / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Value: 0.53 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 45.8 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 72000 / Symmetry type: POINT | ||||||||||||||||||||||||
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