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- EMDB-10774: Structure of a human 48S translational initiation complex - eIF2-TC -

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Basic information

Entry
Database: EMDB / ID: EMD-10774
TitleStructure of a human 48S translational initiation complex - eIF2-TC
Map data
Sample
  • Complex: 48S initiation complex
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 2
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 1
    • RNA: Initiator methionine tRNA
    • RNA: mRNAMessenger RNA
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 3
Function / homology
Function and homology information


male germ cell proliferation / regulation of translation in response to endoplasmic reticulum stress / translation initiation ternary complex / glial limiting end-foot / response to kainic acid / response to manganese-induced endoplasmic reticulum stress / positive regulation of type B pancreatic cell apoptotic process / methionyl-initiator methionine tRNA binding / Response of EIF2AK1 (HRI) to heme deficiency / negative regulation of translational initiation in response to stress ...male germ cell proliferation / regulation of translation in response to endoplasmic reticulum stress / translation initiation ternary complex / glial limiting end-foot / response to kainic acid / response to manganese-induced endoplasmic reticulum stress / positive regulation of type B pancreatic cell apoptotic process / methionyl-initiator methionine tRNA binding / Response of EIF2AK1 (HRI) to heme deficiency / negative regulation of translational initiation in response to stress / Recycling of eIF2:GDP / PERK-mediated unfolded protein response / eukaryotic translation initiation factor 2 complex / PERK regulates gene expression / regulation of translational initiation in response to stress / cytoplasmic translational initiation / translation factor activity, RNA binding / protein-synthesizing GTPase / formation of cytoplasmic translation initiation complex / formation of translation preinitiation complex / : / eukaryotic 48S preinitiation complex / Formation of the ternary complex, and subsequently, the 43S complex / Ribosomal scanning and start codon recognition / Translation initiation complex formation / Response of EIF2AK4 (GCN2) to amino acid deficiency / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / stress granule assembly / translation initiation factor binding / translational initiation / cellular response to amino acid starvation / translation initiation factor activity / response to endoplasmic reticulum stress / PKR-mediated signaling / ABC-family proteins mediated transport / cytoplasmic stress granule / male gonad development / cellular response to UV / ribosome binding / cellular response to heat / cellular response to oxidative stress / in utero embryonic development / cadherin binding / mRNA binding / GTPase activity / synapse / GTP binding / RNA binding / extracellular exosome / membrane / metal ion binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Translation initiation factor IF2/IF5 / Translation initiation factor IF2/IF5 domain / Translation initiation factor IF2/IF5, N-terminal / Translation initiation factor IF2/IF5, zinc-binding / Domain found in IF2B/IF5 / domain present in translation initiation factor eIF2B and eIF5 / IF2a, S1-like domain / Translation initiation factor 2, alpha subunit / Translation initiation factor 2, alpha subunit, middle domain superfamily / Translation initiation factor 2, alpha subunit, C-terminal ...Translation initiation factor IF2/IF5 / Translation initiation factor IF2/IF5 domain / Translation initiation factor IF2/IF5, N-terminal / Translation initiation factor IF2/IF5, zinc-binding / Domain found in IF2B/IF5 / domain present in translation initiation factor eIF2B and eIF5 / IF2a, S1-like domain / Translation initiation factor 2, alpha subunit / Translation initiation factor 2, alpha subunit, middle domain superfamily / Translation initiation factor 2, alpha subunit, C-terminal / Eukaryotic translation initiation factor 2 alpha subunit / Initiation factor eIF2 gamma, domain 2 / Initiation factor eIF2 gamma, GTP-binding domain / Initiation factor eIF2 gamma, C-terminal / Initiation factor eIF2 gamma, C terminal / Translation elongation factor EF1A/initiation factor IF2gamma, C-terminal / S1 domain profile. / Translation elongation factor EFTu-like, domain 2 / Elongation factor Tu domain 2 / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / S1 domain / Translational (tr)-type GTP-binding domain / Elongation factor Tu GTP binding domain / Translational (tr)-type guanine nucleotide-binding (G) domain profile. / Translation protein, beta-barrel domain superfamily / Nucleic acid-binding, OB-fold / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Eukaryotic translation initiation factor 2 subunit 1 / Eukaryotic translation initiation factor 2 subunit 2 / Eukaryotic translation initiation factor 2 subunit 3
Similarity search - Component
Biological speciesHomo sapiens (human) / Human (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsBrito Querido J / Sokabe M / Kraatz S / Gordiyenko Y / Skehel M / Fraser C / Ramakrishnan V
Funding support United Kingdom, United States, 3 items
OrganizationGrant numberCountry
Wellcome TrustWTY096570 United Kingdom
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM092927 United States
Medical Research Council (MRC, United Kingdom)MC_U105184332 United Kingdom
CitationJournal: Science / Year: 2020
Title: Structure of a human 48 translational initiation complex.
Authors: Jailson Brito Querido / Masaaki Sokabe / Sebastian Kraatz / Yuliya Gordiyenko / J Mark Skehel / Christopher S Fraser / V Ramakrishnan /
Abstract: A key step in translational initiation is the recruitment of the 43 preinitiation complex by the cap-binding complex [eukaryotic initiation factor 4F (eIF4F)] at the 5' end of messenger RNA (mRNA) to ...A key step in translational initiation is the recruitment of the 43 preinitiation complex by the cap-binding complex [eukaryotic initiation factor 4F (eIF4F)] at the 5' end of messenger RNA (mRNA) to form the 48 initiation complex (i.e., the 48). The 48 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 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 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 subunit during scanning.
History
DepositionMar 17, 2020-
Header (metadata) releaseSep 16, 2020-
Map releaseSep 16, 2020-
UpdateSep 16, 2020-
Current statusSep 16, 2020Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.035
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.035
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6ybv
  • Surface level: 0.035
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6ybv
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_10774.png

Downloads & links

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Map

FileDownload / File: emd_10774.map.gz / Format: CCP4 / Size: 476.8 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.074 Å
Density
Contour LevelBy AUTHOR: 0.025 / Movie #1: 0.035
Minimum - Maximum-0.13308457 - 0.23474605
Average (Standard dev.)0.00015950525 (±0.0037637458)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions500500500
Spacing500500500
CellA=B=C: 537.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0741.0741.074
M x/y/z500500500
origin x/y/z0.0000.0000.000
length x/y/z537.000537.000537.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS500500500
D min/max/mean-0.1330.2350.000

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Supplemental data

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Mask #1

Fileemd_10774_msk_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram (log scale)

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Additional map: #1

Fileemd_10774_additional.map
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Half map: #1

Fileemd_10774_half_map_1.map
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: #2

Fileemd_10774_half_map_2.map
Projections & Slices
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Sample components

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Entire : 48S initiation complex

EntireName: 48S initiation complex
Components
  • Complex: 48S initiation complex
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 2
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 1
    • RNA: Initiator methionine tRNA
    • RNA: mRNAMessenger RNA
    • Protein or peptide: Eukaryotic translation initiation factor 2 subunit 3

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Supramolecule #1: 48S initiation complex

SupramoleculeName: 48S initiation complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Eukaryotic translation initiation factor 2 subunit 2

MacromoleculeName: Eukaryotic translation initiation factor 2 subunit 2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Human (human)
Molecular weightTheoretical: 38.454484 KDa
SequenceString: MSGDEMIFDP TMSKKKKKKK KPFMLDEEGD TQTEETQPSE TKEVEPEPTE DKDLEADEED TRKKDASDDL DDLNFFNQKK KKKKTKKIF DIDEAEEGVK DLKIESDVQE PTEPEDDLDI MLGNKKKKKK NVKFPDEDEI LEKDEALEDE DNKKDDGISF S NQTGPAWA ...String:
MSGDEMIFDP TMSKKKKKKK KPFMLDEEGD TQTEETQPSE TKEVEPEPTE DKDLEADEED TRKKDASDDL DDLNFFNQKK KKKKTKKIF DIDEAEEGVK DLKIESDVQE PTEPEDDLDI MLGNKKKKKK NVKFPDEDEI LEKDEALEDE DNKKDDGISF S NQTGPAWA GSERDYTYEE LLNRVFNIMR EKNPDMVAGE KRKFVMKPPQ VVRVGTKKTS FVNFTDICKL LHRQPKHLLA FL LAELGTS GSIDGNNQLV IKGRFQQKQI ENVLRRYIKE YVTCHTCRSP DTILQKDTRL YFLQCETCHS RCSVASIKTG FQA VTGKRA QLRAKAN

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Macromolecule #2: Eukaryotic translation initiation factor 2 subunit 1

MacromoleculeName: Eukaryotic translation initiation factor 2 subunit 1 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Human (human)
Molecular weightTheoretical: 36.16118 KDa
SequenceString: MPGLSCRFYQ HKFPEVEDVV MVNVRSIAEM GAYVSLLEYN NIEGMILLSE LSRRRIRSIN KLIRIGRNEC VVVIRVDKEK GYIDLSKRR VSPEEAIKCE DKFTKSKTVY SILRHVAEVL EYTKDEQLES LFQRTAWVFD DKYKRPGYGA YDAFKHAVSD P SILDSLDL ...String:
MPGLSCRFYQ HKFPEVEDVV MVNVRSIAEM GAYVSLLEYN NIEGMILLSE LSRRRIRSIN KLIRIGRNEC VVVIRVDKEK GYIDLSKRR VSPEEAIKCE DKFTKSKTVY SILRHVAEVL EYTKDEQLES LFQRTAWVFD DKYKRPGYGA YDAFKHAVSD P SILDSLDL NEDEREVLIN NINRRLTPQA VKIRADIEVA CYGYEGIDAV KEALRAGLNC STENMPIKIN LIAPPRYVMT TT TLERTEG LSVLSQAMAV IKEKIEEKRG VFNVQMEPKV VTDTDETELA RQMERLEREN AEVDGDDDAE EMEAKAED

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Macromolecule #5: Eukaryotic translation initiation factor 2 subunit 3

MacromoleculeName: Eukaryotic translation initiation factor 2 subunit 3 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO / EC number: protein-synthesizing GTPase
Source (natural)Organism: Human (human)
Molecular weightTheoretical: 51.178406 KDa
SequenceString: MAGGEAGVTL GQPHLSRQDL TTLDVTKLTP LSHEVISRQA TINIGTIGHV AHGKSTVVKA ISGVHTVRFK NELERNITIK LGYANAKIY KLDDPSCPRP ECYRSCGSST PDEFPTDIPG TKGNFKLVRH VSFVDCPGHD ILMATMLNGA AVMDAALLLI A GNESCPQP ...String:
MAGGEAGVTL GQPHLSRQDL TTLDVTKLTP LSHEVISRQA TINIGTIGHV AHGKSTVVKA ISGVHTVRFK NELERNITIK LGYANAKIY KLDDPSCPRP ECYRSCGSST PDEFPTDIPG TKGNFKLVRH VSFVDCPGHD ILMATMLNGA AVMDAALLLI A GNESCPQP QTSEHLAAIE IMKLKHILIL QNKIDLVKES QAKEQYEQIL AFVQGTVAEG APIIPISAQL KYNIEVVCEY IV KKIPVPP RDFTSEPRLI VIRSFDVNKP GCEVDDLKGG VAGGSILKGV LKVGQEIEVR PGIVSKDSEG KLMCKPIFSK IVS LFAEHN DLQYAAPGGL IGVGTKIDPT LCRADRMVGQ VLGAVGALPE IFTELEISYF LLRRLLGVRT EGDKKAAKVQ KLSK NEVLM VNIGSLSTGG RVSAVKADLG KIVLTNPVCT EVGEKIALSR RVEKHWRLIG WGQIRRGVTI KPTVDDD

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Macromolecule #3: Initiator methionine tRNA

MacromoleculeName: Initiator methionine tRNA / type: rna / ID: 3 / Number of copies: 1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 24.23151 KDa
SequenceString:
AGCAGAGUGG CGCAGCGGAA GCGUGCUGGG CCCAUAACCC AGAGGUCGAU GGAUCGAAAC CAUCCUCUGC UACCA

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Macromolecule #4: mRNA

MacromoleculeName: mRNA / type: rna / ID: 4 / Number of copies: 1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 942.66 Da
SequenceString:
AAA

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: INTEGRATING / Average exposure time: 1.0 sec. / Average electron dose: 107.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

4kzy

Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 33706
FSC plot (resolution estimation)

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