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Open data
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Basic information
Entry | Database: PDB / ID: 6fec | |||||||||
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Title | Human cap-dependent 48S pre-initiation complex | |||||||||
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![]() | RIBOSOME / Translation initiation / 48S complex / capped mRNA / initiation factor 4B / start codon recognition | |||||||||
Function / homology | ![]() eukaryotic translation initiation factor 4F complex assembly / RNA strand-exchange activity / positive regulation of mRNA binding / viral translational termination-reinitiation / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 3 complex, eIF3e / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / methionyl-initiator methionine tRNA binding / Activation of the mRNA upon binding of the cap-binding complex and eIFs, and subsequent binding to 43S ...eukaryotic translation initiation factor 4F complex assembly / RNA strand-exchange activity / positive regulation of mRNA binding / viral translational termination-reinitiation / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 3 complex, eIF3e / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / methionyl-initiator methionine tRNA binding / Activation of the mRNA upon binding of the cap-binding complex and eIFs, and subsequent binding to 43S / eukaryotic translation initiation factor 3 complex, eIF3m / PERK regulates gene expression / RNA strand annealing activity / eukaryotic translation initiation factor 2 complex / eukaryotic translation initiation factor 3 complex / eukaryotic translation initiation factor 4F complex / formation of cytoplasmic translation initiation complex / cytoplasmic translational initiation / Z-decay: degradation of maternal mRNAs by zygotically expressed factors / translation factor activity, RNA binding / eukaryotic 43S preinitiation complex / formation of translation preinitiation complex / Deadenylation of mRNA / eukaryotic 48S preinitiation complex / M-decay: degradation of maternal mRNAs by maternally stored factors / negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / negative regulation of peptidyl-serine phosphorylation / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of gastrulation / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / protein tyrosine kinase inhibitor activity / IRE1-RACK1-PP2A complex / positive regulation of endodeoxyribonuclease activity / positive regulation of Golgi to plasma membrane protein transport / translation at postsynapse / TNFR1-mediated ceramide production / protein-synthesizing GTPase / negative regulation of DNA repair / negative regulation of RNA splicing / mammalian oogenesis stage / regulation of translational initiation / supercoiled DNA binding / activation-induced cell death of T cells / neural crest cell differentiation / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / NF-kappaB complex / oxidized purine DNA binding / cysteine-type endopeptidase activator activity involved in apoptotic process / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / ubiquitin-like protein conjugating enzyme binding / regulation of establishment of cell polarity / translation at presynapse / Formation of the ternary complex, and subsequently, the 43S complex / negative regulation of phagocytosis / erythrocyte homeostasis / rRNA modification in the nucleus and cytosol / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / protein kinase A binding / negative regulation of ubiquitin protein ligase activity / pigmentation / Ribosomal scanning and start codon recognition / ion channel inhibitor activity / Translation initiation complex formation / positive regulation of mitochondrial depolarization / positive regulation of T cell receptor signaling pathway / positive regulation of activated T cell proliferation / negative regulation of Wnt signaling pathway / negative regulation of translational frameshifting / Protein hydroxylation / BH3 domain binding / TOR signaling / SARS-CoV-1 modulates host translation machinery / regulation of cell division / mTORC1-mediated signalling / T cell proliferation involved in immune response / Peptide chain elongation / iron-sulfur cluster binding / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / Selenocysteine synthesis / positive regulation of signal transduction by p53 class mediator / Formation of a pool of free 40S subunits / ribosomal small subunit binding / ubiquitin ligase inhibitor activity / Eukaryotic Translation Termination / Response of EIF2AK4 (GCN2) to amino acid deficiency / SRP-dependent cotranslational protein targeting to membrane / negative regulation of ubiquitin-dependent protein catabolic process / Viral mRNA Translation / phagocytic cup / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / erythrocyte development / Major pathway of rRNA processing in the nucleolus and cytosol / regulation of translational fidelity / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 6.3 Å | |||||||||
![]() | Schaffitzel, C. / Schaffitzel, C. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of a human cap-dependent 48S translation pre-initiation complex. Authors: Boris Eliseev / Lahari Yeramala / Alexander Leitner / Manikandan Karuppasamy / Etienne Raimondeau / Karine Huard / Elena Alkalaeva / Ruedi Aebersold / Christiane Schaffitzel / ![]() ![]() ![]() ![]() Abstract: Eukaryotic translation initiation is tightly regulated, requiring a set of conserved initiation factors (eIFs). Translation of a capped mRNA depends on the trimeric eIF4F complex and eIF4B to load ...Eukaryotic translation initiation is tightly regulated, requiring a set of conserved initiation factors (eIFs). Translation of a capped mRNA depends on the trimeric eIF4F complex and eIF4B to load the mRNA onto the 43S pre-initiation complex comprising 40S and initiation factors 1, 1A, 2, 3 and 5 as well as initiator-tRNA. Binding of the mRNA is followed by mRNA scanning in the 48S pre-initiation complex, until a start codon is recognised. Here, we use a reconstituted system to prepare human 48S complexes assembled on capped mRNA in the presence of eIF4B and eIF4F. The highly purified h-48S complexes are used for cross-linking/mass spectrometry, revealing the protein interaction network in this complex. We report the electron cryo-microscopy structure of the h-48S complex at 6.3 Å resolution. While the majority of eIF4B and eIF4F appear to be flexible with respect to the ribosome, additional density is detected at the entrance of the 40S mRNA channel which we attribute to the RNA-recognition motif of eIF4B. The eight core subunits of eIF3 are bound at the 40S solvent-exposed side, as well as the subunits eIF3d, eIF3b and eIF3i. elF2 and initiator-tRNA bound to the start codon are present at the 40S intersubunit side. This cryo-EM structure represents a molecular snap-shot revealing the h-48S complex following start codon recognition. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.6 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 4242MC ![]() 4265C M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
-EUKARYOTIC TRANSLATION INITIATION FACTOR ... , 14 types, 14 molecules 123456789PSduw
#1: Protein | Mass: 164902.656 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#2: Protein | Mass: 97923.547 Da / Num. of mol.: 1 / Mutation: A577Y / Source method: isolated from a natural source / Source: (natural) ![]() |
#3: Protein | Mass: 52281.633 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#4: Protein | Mass: 37846.730 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#5: Protein | Mass: 39952.281 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#6: Protein | Mass: 25129.709 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#7: Protein | Mass: 66804.766 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#8: Protein | Mass: 42555.832 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#9: Protein | Mass: 42203.555 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#19: Protein | Mass: 30633.297 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#22: Protein | Mass: 45862.441 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#32: Protein/peptide | Mass: 2103.416 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#49: Protein | Mass: 72324.820 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#50: Protein | Mass: 124402.336 Da / Num. of mol.: 1 / Mutation: D104E, Y124F / Source method: isolated from a natural source / Source: (natural) ![]() |
-RNA chain , 3 types, 3 molecules AFN
#10: RNA chain | Mass: 572789.812 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#11: RNA chain | Mass: 8238.953 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#18: RNA chain | Mass: 24231.510 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
+40S ribosomal protein ... , 31 types, 31 molecules GHIJKLQRUVWXYZabcefghijklnoqrst
-Protein , 2 types, 2 molecules mp
#41: Protein | Mass: 34669.113 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#44: Protein | Mass: 8358.903 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Non-polymers , 1 types, 415 molecules 
#51: Water | ChemComp-HOH / |
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-Details
Has protein modification | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
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Molecular weight | Value: 2.0 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) |
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Source (recombinant) |
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Buffer solution | pH: 7.5 Details: 20 mM Tris HCl, 50 mM KOAc, 2.5 mM MgCl2, 2 mM DTT, 0.25 mM spermidine 0.25 mM GMPPNP | ||||||||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid type: Quantifoil R2/2 | ||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 112000 X / Nominal defocus max: 4000 nm / Nominal defocus min: 1500 nm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Electron dose: 30 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON II (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.13_2998: / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 6.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 50604 / Algorithm: BACK PROJECTION / Num. of class averages: 1 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Space: REAL / Target criteria: Cross-correlation coefficient | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 6.3→270 Å / Cor.coef. Fo:Fc: 0.961 / SU B: 135.967 / SU ML: 0.877 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 105.458 Å2
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Refinement step | Cycle: 1 / Total: 32425 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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