6YBV

Structure of a human 48S translational initiation complex - eIF2-TC

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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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:  
    6YBD, 6YBS, 6YBT, 6YBV, 6YBW, 6ZMW

  • 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 (i.e ...

    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 2 subunit 2A [auth s]333Homo sapiensMutation(s): 0 
Gene Names: EIF2S2, EIF2B
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Find proteins for P20042 (Homo sapiens)
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Go to UniProtKB:  P20042
PHAROS:  P20042
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UniProt GroupP20042
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 2 subunit 1B [auth r]315Homo sapiensMutation(s): 0 
Gene Names: EIF2S1, EIF2A
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Find proteins for P05198 (Homo sapiens)
Explore P05198 
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PHAROS:  P05198
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UniProt GroupP05198
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Eukaryotic translation initiation factor 2 subunit 3E [auth t]472Homo sapiensMutation(s): 0 
Gene Names: EIF2S3, EIF2G
EC: 3.6.5.3
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Find proteins for P41091 (Homo sapiens)
Explore P41091 
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PHAROS:  P41091
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UniProt GroupP41091
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Entity ID: 3
MoleculeChainsLengthOrganismImage
Initiator methionine tRNAC [auth w]75Homo sapiens
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Entity ID: 4
MoleculeChainsLengthOrganismImage
mRNAD [auth k]3Homo sapiens
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 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  (Full details and data files)

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