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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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Keywords | RIBOSOME / Translation initiation / 48S complex / capped mRNA / initiation factor 4B / start codon recognition | |||||||||
| Function / homology | Function and homology informationeukaryotic translation initiation factor 4F complex assembly / RNA strand-exchange activity / Cellular response to mitochondrial stress / viral translational termination-reinitiation / 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, eIF3e / eukaryotic translation initiation factor 3 complex, eIF3m ...eukaryotic translation initiation factor 4F complex assembly / RNA strand-exchange activity / Cellular response to mitochondrial stress / viral translational termination-reinitiation / 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, eIF3e / eukaryotic translation initiation factor 3 complex, eIF3m / RNA strand annealing activity / PERK regulates gene expression / eukaryotic translation initiation factor 2 complex / eukaryotic translation initiation factor 4F complex / Z-decay: degradation of maternal mRNAs by zygotically expressed factors / formation of cytoplasmic translation initiation complex / eukaryotic translation initiation factor 3 complex / eukaryotic 43S preinitiation complex / translation factor activity, RNA binding / Deadenylation of mRNA / formation of translation preinitiation complex / 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 / positive regulation of gastrulation / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / protein tyrosine kinase inhibitor activity / regulation of translational initiation / IRE1-RACK1-PP2A complex / positive regulation of Golgi to plasma membrane protein transport / protein-synthesizing GTPase / positive regulation of DNA-templated transcription initiation / TNFR1-mediated ceramide production / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / negative regulation of RNA splicing / supercoiled DNA binding / neural crest cell differentiation / NF-kappaB complex / negative regulation of DNA repair / oxidized purine DNA binding / cytoplasmic translational initiation / cysteine-type endopeptidase activator activity involved in apoptotic process / regulation of establishment of cell polarity / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / negative regulation of bicellular tight junction assembly / ubiquitin-like protein conjugating enzyme binding / rRNA modification in the nucleus and cytosol / negative regulation of phagocytosis / erythrocyte homeostasis / Formation of the ternary complex, and subsequently, the 43S complex / cytoplasmic side of rough endoplasmic reticulum membrane / protein kinase A binding / ion channel inhibitor activity / Ribosomal scanning and start codon recognition / laminin receptor activity / pigmentation / Translation initiation complex formation / positive regulation of mitochondrial depolarization / negative regulation of Wnt signaling pathway / BH3 domain binding / negative regulation of translational frameshifting / TOR signaling / Protein hydroxylation / SARS-CoV-1 modulates host translation machinery / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / iron-sulfur cluster binding / mTORC1-mediated signalling / positive regulation of GTPase activity / ribosomal small subunit binding / Peptide chain elongation / regulation of cell division / Selenocysteine synthesis / cellular response to ethanol / Formation of a pool of free 40S subunits / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / Eukaryotic Translation Termination / protein serine/threonine kinase inhibitor activity / SRP-dependent cotranslational protein targeting to membrane / Response of EIF2AK4 (GCN2) to amino acid deficiency / negative regulation of protein binding / Viral mRNA Translation / ubiquitin ligase inhibitor activity / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / positive regulation of signal transduction by p53 class mediator / GTP hydrolysis and joining of the 60S ribosomal subunit / negative regulation of ubiquitin-dependent protein catabolic process / L13a-mediated translational silencing of Ceruloplasmin expression / Major pathway of rRNA processing in the nucleolus and cytosol / positive regulation of microtubule polymerization / regulation of translational fidelity / phagocytic cup / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / positive regulation of intrinsic apoptotic signaling pathway / spindle assembly / Nuclear events stimulated by ALK signaling in cancer / translation regulator activity / rough endoplasmic reticulum Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 6.3 Å | |||||||||
Authors | Schaffitzel, C. / Schaffitzel, C. | |||||||||
| Funding support | Belgium, 2items
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Citation | Journal: Nucleic Acids Res / Year: 2018Title: 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. | |||||||||
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Structure visualization
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| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 6fec.cif.gz | 2.6 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb6fec.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 6fec.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/fe/6fec ftp://data.pdbj.org/pub/pdb/validation_reports/fe/6fec | 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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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) Homo sapiens (human) |
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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) Homo sapiens (human) / Cell line: hela |
| #3: Protein | Mass: 52281.633 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: UniProt: P60228 |
| #4: Protein | Mass: 37846.730 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: Hela / References: ubiquitinyl hydrolase 1 |
| #5: Protein | Mass: 39952.281 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela |
| #6: Protein | Mass: 25129.709 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: UniProt: Q9UBQ5 |
| #7: Protein | Mass: 66804.766 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: UniProt: Q9Y262 |
| #8: Protein | Mass: 42555.832 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: UniProt: Q7L2H7 |
| #9: Protein | Mass: 42203.555 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) |
| #19: Protein | Mass: 30633.297 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela |
| #22: Protein | Mass: 45862.441 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: UniProt: P41091 |
| #32: Protein/peptide | Mass: 2103.416 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) |
| #49: Protein | Mass: 72324.820 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: EIF4B / Plasmid: pFastBac_eIF4B / Production host: ![]() |
| #50: Protein | Mass: 124402.336 Da / Num. of mol.: 1 / Mutation: D104E, Y124F / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela |
-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) Homo sapiens (human) / Cell line: hela |
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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.) Homo sapiens (human) / Gene: beta globin derived / Plasmid: pET28a-MVHL-STOP2 / Production host: ![]() |
| #18: RNA chain | Mass: 24231.510 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: GenBank: 174924 |
+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) Homo sapiens (human) / Cell line: hela / References: UniProt: P63244 |
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| #44: Protein | Mass: 8358.903 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Cell line: hela / References: UniProt: P62979 |
-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 | ||||||||||||||||||||||||||||||
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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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| 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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| 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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About Yorodumi




Homo sapiens (human)
Belgium, 2items
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