6YBT

Structure of a human 48S translational initiation complex - eIF3bgi


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report



Literature

Structure of a human 48Stranslational initiation complex.

Brito Querido, J.Sokabe, M.Kraatz, S.Gordiyenko, Y.Skehel, J.M.Fraser, C.S.Ramakrishnan, V.

(2020) Science 369: 1220-1227

  • DOI: 10.1126/science.aba4904
  • Primary Citation of Related Structures:  
    6ZMW, 6YBW, 6YBT, 6YBS, 6YBV, 6YBD

  • PubMed Abstract: 
  • A key step in translational initiation is the recruitment of the 43 S preinitiation complex by the cap-binding complex [eukaryotic initiation factor 4F (eIF4F)] at the 5' end of messenger RNA (mRNA) to form the 48 S initiation complex ...

    A key step in translational initiation is the recruitment of the 43 S preinitiation complex by the cap-binding complex [eukaryotic initiation factor 4F (eIF4F)] at the 5' end of messenger RNA (mRNA) to form the 48 S initiation complex (i.e., the 48 S ). The 48 S then scans along the mRNA to locate a start codon. To understand the mechanisms involved, we used cryo-electron microscopy to determine the structure of a reconstituted human 48 S The structure reveals insights into early events of translation initiation complex assembly, as well as how eIF4F interacts with subunits of eIF3 near the mRNA exit channel in the 43 S The location of eIF4F is consistent with a slotting model of mRNA recruitment and suggests that downstream mRNA is unwound at least in part by being "pulled" through the 40 S subunit during scanning.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, UK. csfraser@ucdavis.edu ramak@mrc-lmb.cam.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 3 subunit Au1350Homo sapiensMutation(s): 0 
Gene Names: EIF3AEIF3S10KIAA0139
Find proteins for Q14152 (Homo sapiens)
Explore Q14152 
Go to UniProtKB:  Q14152
NIH Common Fund Data Resources
PHAROS  Q14152
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 3 subunit I2325Homo sapiensMutation(s): 0 
Gene Names: EIF3IEIF3S2TRIP1
Find proteins for Q13347 (Homo sapiens)
Explore Q13347 
Go to UniProtKB:  Q13347
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PHAROS  Q13347
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 3 subunit B1814Homo sapiensMutation(s): 0 
Gene Names: EIF3BEIF3S9
Find proteins for P55884 (Homo sapiens)
Explore P55884 
Go to UniProtKB:  P55884
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PHAROS  P55884
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited KingdomWTY096570
Medical Research Council (MRC, United Kingdom)United KingdomMC_U105184332
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM092927

Revision History 

  • Version 1.0: 2020-09-16
    Type: Initial release