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- PDB-7d45: eIF2B-eIF2(aP), aP1 complex -

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Basic information

Entry
Database: PDB / ID: 7d45
TitleeIF2B-eIF2(aP), aP1 complex
Components
  • (Translation initiation factor eIF-2B subunit ...) x 5
  • Eukaryotic translation initiation factor 2 subunit 1
KeywordsTRANSLATION / Complex / Translational control
Function / homology
Function and homology information


translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / eukaryotic translation initiation factor 2B complex / response to manganese-induced endoplasmic reticulum stress / Cellular response to mitochondrial stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP ...translation initiation ternary complex / regulation of translation in response to endoplasmic reticulum stress / glial limiting end-foot / HRI-mediated signaling / eukaryotic translation initiation factor 2B complex / response to manganese-induced endoplasmic reticulum stress / Cellular response to mitochondrial stress / positive regulation of type B pancreatic cell apoptotic process / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / negative regulation of translational initiation in response to stress / PERK-mediated unfolded protein response / PERK regulates gene expression / response to kainic acid / eukaryotic translation initiation factor 2 complex / cytoplasmic translational initiation / regulation of translational initiation in response to stress / guanyl-nucleotide exchange factor complex / astrocyte development / eukaryotic 48S preinitiation complex / astrocyte differentiation / oligodendrocyte development / regulation of translational initiation / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / Translation initiation complex formation / positive regulation of translational initiation / Response of EIF2AK4 (GCN2) to amino acid deficiency / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / response to glucose / ovarian follicle development / mitophagy / translation initiation factor binding / translation initiation factor activity / myelination / stress granule assembly / cellular response to amino acid starvation / response to endoplasmic reticulum stress / guanyl-nucleotide exchange factor activity / central nervous system development / hippocampus development / translational initiation / response to peptide hormone / PKR-mediated signaling / ABC-family proteins mediated transport / cytoplasmic stress granule / cellular response to UV / T cell receptor signaling pathway / regulation of translation / ribosome binding / cellular response to heat / response to heat / cellular response to oxidative stress / positive regulation of apoptotic process / synapse / GTP binding / mitochondrion / RNA binding / extracellular exosome / ATP binding / identical protein binding / nucleus / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
Translation initiation factor eIF-2B, N-terminal domain / Translation initiation factor eif-2b; domain 2 / Translation initiation factor eIF-2B subunit alpha, N-terminal / : / : / Translation initiation factor eIF-2B subunit epsilon, N-terminal / Translation initiation factor eIF-2B subunit epsilon, W2 domain / : / : / EIF2B subunit epsilon LbH domain ...Translation initiation factor eIF-2B, N-terminal domain / Translation initiation factor eif-2b; domain 2 / Translation initiation factor eIF-2B subunit alpha, N-terminal / : / : / Translation initiation factor eIF-2B subunit epsilon, N-terminal / Translation initiation factor eIF-2B subunit epsilon, W2 domain / : / : / EIF2B subunit epsilon LbH domain / Initiation factor 2B-related / Initiation factor 2B-like, C-terminal / Initiation factor 2 subunit family / eIF4-gamma/eIF5/eIF2-epsilon / Domain at the C-termini of GCD6, eIF-2B epsilon, eIF-4 gamma and eIF-5 / W2 domain / W2 domain profile. / Translation initiation factor 2, alpha subunit / Translation initiation factor 2, alpha subunit, middle domain superfamily / Translation initiation factor 2, alpha subunit, C-terminal / IF2a, S1-like domain / Eukaryotic translation initiation factor 2 alpha subunit / Nucleotidyl transferase domain / Nucleotidyl transferase / NagB/RpiA transferase-like / Bacterial transferase hexapeptide (six repeats) / Trimeric LpxA-like superfamily / Spore Coat Polysaccharide Biosynthesis Protein SpsA; Chain A / Spore Coat Polysaccharide Biosynthesis Protein SpsA; Chain A / S1 domain profile. / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / S1 domain / Nucleotide-diphospho-sugar transferases / Four Helix Bundle (Hemerythrin (Met), subunit A) / Armadillo-type fold / Nucleic acid-binding, OB-fold / Alpha-Beta Complex / Up-down Bundle / Rossmann fold / 3-Layer(aba) Sandwich / Mainly Alpha / Alpha Beta
Similarity search - Domain/homology
Eukaryotic translation initiation factor 2 subunit 1 / Translation initiation factor eIF2B subunit beta / Translation initiation factor eIF2B subunit epsilon / Translation initiation factor eIF2B subunit alpha / Translation initiation factor eIF2B subunit gamma / Translation initiation factor eIF2B subunit delta
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsKashiwagi, K. / Ito, T.
Funding support Japan, 2items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS) Japan
Japan Agency for Medical Research and Development (AMED) Japan
CitationJournal: Mol Cell / Year: 2021
Title: ISRIB Blunts the Integrated Stress Response by Allosterically Antagonising the Inhibitory Effect of Phosphorylated eIF2 on eIF2B.
Authors: Alisa F Zyryanova / Kazuhiro Kashiwagi / Claudia Rato / Heather P Harding / Ana Crespillo-Casado / Luke A Perera / Ayako Sakamoto / Madoka Nishimoto / Mayumi Yonemochi / Mikako Shirouzu / ...Authors: Alisa F Zyryanova / Kazuhiro Kashiwagi / Claudia Rato / Heather P Harding / Ana Crespillo-Casado / Luke A Perera / Ayako Sakamoto / Madoka Nishimoto / Mayumi Yonemochi / Mikako Shirouzu / Takuhiro Ito / David Ron /
Abstract: The small molecule ISRIB antagonizes the activation of the integrated stress response (ISR) by phosphorylated translation initiation factor 2, eIF2(αP). ISRIB and eIF2(αP) bind distinct sites in ...The small molecule ISRIB antagonizes the activation of the integrated stress response (ISR) by phosphorylated translation initiation factor 2, eIF2(αP). ISRIB and eIF2(αP) bind distinct sites in their common target, eIF2B, a guanine nucleotide exchange factor for eIF2. We have found that ISRIB-mediated acceleration of eIF2B's nucleotide exchange activity in vitro is observed preferentially in the presence of eIF2(αP) and is attenuated by mutations that desensitize eIF2B to the inhibitory effect of eIF2(αP). ISRIB's efficacy as an ISR inhibitor in cells also depends on presence of eIF2(αP). Cryoelectron microscopy (cryo-EM) showed that engagement of both eIF2B regulatory sites by two eIF2(αP) molecules remodels both the ISRIB-binding pocket and the pockets that would engage eIF2α during active nucleotide exchange, thereby discouraging both binding events. In vitro, eIF2(αP) and ISRIB reciprocally opposed each other's binding to eIF2B. These findings point to antagonistic allostery in ISRIB action on eIF2B, culminating in inhibition of the ISR.
History
DepositionSep 22, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Dec 9, 2020Provider: repository / Type: Initial release
Revision 1.0Dec 9, 2020Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.1Jan 27, 2021Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.year
Revision 1.2Oct 30, 2024Group: Data collection / Database references / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.3Jun 25, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 25, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

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Assembly

Deposited unit
A: Translation initiation factor eIF-2B subunit alpha
B: Translation initiation factor eIF-2B subunit alpha
C: Translation initiation factor eIF-2B subunit beta
D: Translation initiation factor eIF-2B subunit beta
E: Translation initiation factor eIF-2B subunit gamma
F: Translation initiation factor eIF-2B subunit gamma
G: Translation initiation factor eIF-2B subunit delta
H: Translation initiation factor eIF-2B subunit delta
I: Translation initiation factor eIF-2B subunit epsilon
J: Translation initiation factor eIF-2B subunit epsilon
K: Eukaryotic translation initiation factor 2 subunit 1


Theoretical massNumber of molelcules
Total (without water)558,65111
Polymers558,65111
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Translation initiation factor eIF-2B subunit ... , 5 types, 10 molecules ABCDEFGHIJ

#1: Protein Translation initiation factor eIF-2B subunit alpha / eIF2Balpha / eIF-2B GDP-GTP exchange factor subunit alpha


Mass: 33754.148 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: EIF2B1, EIF2BA / Production host: Escherichia coli (E. coli) / References: UniProt: Q14232
#2: Protein Translation initiation factor eIF-2B subunit beta / eIF2Bbeta / S20I15 / S20III15 / eIF-2B GDP-GTP exchange factor subunit beta


Mass: 39039.547 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: EIF2B2, EIF2BB / Production host: Escherichia coli (E. coli) / References: UniProt: P49770
#3: Protein Translation initiation factor eIF-2B subunit gamma / eIF2Bgamma / eIF2Bg / eIF-2B GDP-GTP exchange factor subunit gamma


Mass: 50304.230 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: EIF2B3 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9NR50
#4: Protein Translation initiation factor eIF-2B subunit delta / eIF2Bdelta / eIF-2B GDP-GTP exchange factor subunit delta


Mass: 57640.168 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: EIF2B4, EIF2BD / Production host: Escherichia coli (E. coli) / References: UniProt: Q9UI10
#5: Protein Translation initiation factor eIF-2B subunit epsilon / eIF2Bepsilon / eIF-2B GDP-GTP exchange factor subunit epsilon


Mass: 80466.609 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: EIF2B5, EIF2BE / Production host: Escherichia coli (E. coli) / References: UniProt: Q13144

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Protein , 1 types, 1 molecules K

#6: Protein Eukaryotic translation initiation factor 2 subunit 1 / P-eIF2alpha / Eukaryotic translation initiation factor 2 subunit alpha / eIF-2alpha


Mass: 36241.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: EIF2S1, EIF2A / Production host: Homo sapiens (human) / References: UniProt: P05198

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Details

Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Complex of eIF2B with eIF2(aP)COMPLEXall0MULTIPLE SOURCES
2eIF2BCOMPLEX#1-#51RECOMBINANT
3eIF2(aP)COMPLEX#61RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Homo sapiens (human)9606
23Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
12Escherichia coli (E. coli)562
23Homo sapiens (human)9606
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TECNAI ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 208728 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00928003
ELECTRON MICROSCOPYf_angle_d0.91638025
ELECTRON MICROSCOPYf_dihedral_angle_d21.03410066
ELECTRON MICROSCOPYf_chiral_restr0.0524497
ELECTRON MICROSCOPYf_plane_restr0.0054909

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