8TQO

Eukaryotic translation initiation factor 2B tetramer


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

A helical fulcrum in eIF2B coordinates allosteric regulation of stress signaling.

Lawrence, R.E.Shoemaker, S.R.Deal, A.Sangwan, S.Anand, A.A.Wang, L.Marqusee, S.Walter, P.

(2024) Nat Chem Biol 20: 422-431

  • DOI: https://doi.org/10.1038/s41589-023-01453-9
  • Primary Citation of Related Structures:  
    8TQO, 8TQZ

  • PubMed 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 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.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA, USA. rosalie@walterlab.ucsf.edu.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Translation initiation factor eIF-2B subunit epsilon721Homo sapiensMutation(s): 0 
Gene Names: EIF2B5EIF2BE
UniProt & NIH Common Fund Data Resources
Find proteins for Q13144 (Homo sapiens)
Explore Q13144 
Go to UniProtKB:  Q13144
PHAROS:  Q13144
GTEx:  ENSG00000145191 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13144
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Translation initiation factor eIF-2B subunit gammaB [auth I]452Homo sapiensMutation(s): 0 
Gene Names: EIF2B3
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NR50 (Homo sapiens)
Explore Q9NR50 
Go to UniProtKB:  Q9NR50
PHAROS:  Q9NR50
GTEx:  ENSG00000070785 
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UniProt GroupQ9NR50
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Translation initiation factor eIF-2B subunit betaC [auth D]368Homo sapiensMutation(s): 0 
Gene Names: EIF2B2EIF2BB
UniProt & NIH Common Fund Data Resources
Find proteins for P49770 (Homo sapiens)
Explore P49770 
Go to UniProtKB:  P49770
PHAROS:  P49770
GTEx:  ENSG00000119718 
Entity Groups  
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UniProt GroupP49770
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Translation initiation factor eIF-2B subunit deltaD [auth E]523Homo sapiensMutation(s): 0 
Gene Names: EIF2B4EIF2BD
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UI10 (Homo sapiens)
Explore Q9UI10 
Go to UniProtKB:  Q9UI10
PHAROS:  Q9UI10
GTEx:  ENSG00000115211 
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UniProt GroupQ9UI10
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1K99GM143527
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM050945

Revision History  (Full details and data files)

  • Version 1.0: 2023-12-06
    Type: Initial release
  • Version 1.1: 2024-04-10
    Changes: Database references