5A5T

Structure of mammalian eIF3 in the context of the 43S preinitiation complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.5 of the entry. See complete history


Literature

Structure of Mammalian Eif3 in the Context of the 43S Preinitiation Complex.

Des-Georges, A.Dhote, V.Kuhn, L.Hellen, C.U.T.Pestova, T.V.Frank, J.Hashem, Y.

(2015) Nature 525: 491

  • DOI: https://doi.org/10.1038/nature14891
  • Primary Citation of Related Structures:  
    5A5T, 5A5U

  • PubMed Abstract: 

    During eukaryotic translation initiation, 43S complexes, comprising a 40S ribosomal subunit, initiator transfer RNA and initiation factors (eIF) 2, 3, 1 and 1A, attach to the 5'-terminal region of messenger RNA and scan along it to the initiation codon. Scanning on structured mRNAs also requires the DExH-box protein DHX29. Mammalian eIF3 contains 13 subunits and participates in nearly all steps of translation initiation. Eight subunits having PCI (proteasome, COP9 signalosome, eIF3) or MPN (Mpr1, Pad1, amino-terminal) domains constitute the structural core of eIF3, to which five peripheral subunits are flexibly linked. Here we present a cryo-electron microscopy structure of eIF3 in the context of the DHX29-bound 43S complex, showing the PCI/MPN core at ∼6 Å resolution. It reveals the organization of the individual subunits and their interactions with components of the 43S complex. We were able to build near-complete polyalanine-level models of the eIF3 PCI/MPN core and of two peripheral subunits. The implications for understanding mRNA ribosomal attachment and scanning are discussed.


  • Organizational Affiliation

    HHMI, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT A1,362Oryctolagus cuniculusMutation(s): 0 
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UniProt GroupG1SMZ5
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT CB [auth C]843Oryctolagus cuniculusMutation(s): 0 
UniProt
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT EC [auth E]445Oryctolagus cuniculusMutation(s): 0 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT FD [auth F]364Oryctolagus cuniculusMutation(s): 0 
EC: 3.4.19.12
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT HE [auth H]352Oryctolagus cuniculusMutation(s): 0 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT KF [auth K]218Oryctolagus cuniculusMutation(s): 0 
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MoleculeChains Sequence LengthOrganismDetailsImage
UNCHARACTERIZED PROTEING [auth L]564Oryctolagus cuniculusMutation(s): 0 
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT MH [auth M]374Oryctolagus cuniculusMutation(s): 0 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-09
    Type: Initial release
  • Version 1.1: 2015-09-23
    Changes: Database references
  • Version 1.2: 2015-09-30
    Changes: Database references
  • Version 1.3: 2017-08-30
    Changes: Data collection
  • Version 1.4: 2018-10-03
    Changes: Data collection
  • Version 1.5: 2024-05-08
    Changes: Data collection, Database references