5A5T

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.4 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: 10.1038/nature14891
  • Primary Citation of Related Structures:  

  • 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 cod ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT A
A
1362Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3A (EIF3S10)
Find proteins for G1SMZ5 (Oryctolagus cuniculus)
Go to Gene View: EIF3A
Go to UniProtKB:  G1SMZ5
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT C
C
843Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3C (EIF3S8, LOC100344472)
Find proteins for G1U971 (Oryctolagus cuniculus)
Go to Gene View: EIF3C
Go to UniProtKB:  G1U971
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT E
E
445Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3E (EIF3S6, INT6)
Find proteins for G1SUC8 (Oryctolagus cuniculus)
Go to Gene View: EIF3E
Go to UniProtKB:  G1SUC8
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT F
F
364Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3F (EIF3S5)
Find proteins for U3KNL5 (Oryctolagus cuniculus)
Go to Gene View: EIF3F
Go to UniProtKB:  U3KNL5
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT H
H
352Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3H (EIF3S3)
Find proteins for G1ST95 (Oryctolagus cuniculus)
Go to Gene View: EIF3H
Go to UniProtKB:  G1ST95
Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT K
K
218Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3K (EIF3S12)
Find proteins for G1T3L2 (Oryctolagus cuniculus)
Go to Gene View: EIF3K
Go to UniProtKB:  G1T3L2
Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
UNCHARACTERIZED PROTEIN
L
564Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3L (EIF3EIP, EIF3S6IP)
Find proteins for G1SED9 (Oryctolagus cuniculus)
Go to Gene View: EIF3L
Go to UniProtKB:  G1SED9
Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
EUKARYOTIC TRANSLATION INITIATION FACTOR 3 SUBUNIT M
M
374Oryctolagus cuniculusMutation(s): 0 
Gene Names: EIF3M
Find proteins for G1SLW8 (Oryctolagus cuniculus)
Go to Gene View: EIF3M
Go to UniProtKB:  G1SLW8
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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