+Open data
-Basic information
Entry | Database: PDB / ID: 6fec | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Title | Human cap-dependent 48S pre-initiation complex | |||||||||
Components |
| |||||||||
Keywords | RIBOSOME / Translation initiation / 48S complex / capped mRNA / initiation factor 4B / start codon recognition | |||||||||
Function / homology | Function and homology information positive regulation of mRNA binding / Cellular response to mitochondrial stress / viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3e / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / 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 / methionyl-initiator methionine tRNA binding / PERK regulates gene expression ...positive regulation of mRNA binding / Cellular response to mitochondrial stress / viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3e / Response of EIF2AK1 (HRI) to heme deficiency / Recycling of eIF2:GDP / 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 / methionyl-initiator methionine tRNA binding / PERK regulates gene expression / eukaryotic translation initiation factor 2 complex / eukaryotic translation initiation factor 3 complex / eukaryotic translation initiation factor 4F complex / formation of cytoplasmic translation initiation complex / Z-decay: degradation of maternal mRNAs by zygotically expressed factors / cytoplasmic translational initiation / translation factor activity, RNA binding / protein-synthesizing GTPase / eukaryotic 43S preinitiation complex / formation of translation preinitiation complex / Deadenylation of mRNA / : / negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / protein tyrosine kinase inhibitor activity / eukaryotic 48S preinitiation complex / 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 / M-decay: degradation of maternal mRNAs by maternally stored factors / IRE1-RACK1-PP2A complex / positive regulation of endodeoxyribonuclease activity / positive regulation of Golgi to plasma membrane protein transport / TNFR1-mediated ceramide production / negative regulation of RNA splicing / negative regulation of DNA repair / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / supercoiled DNA binding / oxidized purine DNA binding / neural crest cell differentiation / NF-kappaB complex / ubiquitin-like protein conjugating enzyme binding / regulation of translational initiation / regulation of establishment of cell polarity / negative regulation of phagocytosis / rRNA modification in the nucleus and cytosol / erythrocyte homeostasis / Formation of the ternary complex, and subsequently, the 43S complex / cytoplasmic side of rough endoplasmic reticulum membrane / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / laminin receptor activity / pigmentation / protein kinase A binding / negative regulation of ubiquitin protein ligase activity / Ribosomal scanning and start codon recognition / ion channel inhibitor activity / Translation initiation complex formation / mammalian oogenesis stage / positive regulation of mitochondrial depolarization / activation-induced cell death of T cells / positive regulation of T cell receptor signaling pathway / negative regulation of peptidyl-serine phosphorylation / iron-sulfur cluster binding / negative regulation of Wnt signaling pathway / positive regulation of activated T cell proliferation / Protein hydroxylation / regulation of cell division / BH3 domain binding / cysteine-type endopeptidase activator activity involved in apoptotic process / mTORC1-mediated signalling / SARS-CoV-1 modulates host translation machinery / Peptide chain elongation / 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 / ubiquitin ligase inhibitor activity / Eukaryotic Translation Termination / phagocytic cup / Response of EIF2AK4 (GCN2) to amino acid deficiency / SRP-dependent cotranslational protein targeting to membrane / Viral mRNA Translation / negative regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / 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 / TOR signaling / T cell proliferation involved in immune response / regulation of translational fidelity / spindle assembly / positive regulation of cell cycle / Major pathway of rRNA processing in the nucleolus and cytosol / erythrocyte development / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / negative regulation of ubiquitin-dependent protein catabolic process / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / positive regulation of intrinsic apoptotic signaling pathway / ribosomal small subunit export from nucleus 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
| |||||||||
Citation | Journal: Nucleic Acids Res / Year: 2018 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 |
|
-Structure visualization
Movie |
Movie viewer |
---|---|
Structure viewer | Molecule: MolmilJmol/JSmol |
-Downloads & links
-Download
PDBx/mmCIF format | 6fec.cif.gz | 2.6 MB | Display | PDBx/mmCIF format |
---|---|---|---|---|
PDB format | pdb6fec.ent.gz | Display | PDB format | |
PDBx/mmJSON format | 6fec.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 6fec_validation.pdf.gz | 1.4 MB | Display | wwPDB validaton report |
---|---|---|---|---|
Full document | 6fec_full_validation.pdf.gz | 1.6 MB | Display | |
Data in XML | 6fec_validation.xml.gz | 258.2 KB | Display | |
Data in CIF | 6fec_validation.cif.gz | 434.7 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/fe/6fec ftp://data.pdbj.org/pub/pdb/validation_reports/fe/6fec | HTTPS FTP |
-Related structure data
Related structure data | 4242MC 4265C M: map data used to model this data C: citing same article (ref.) |
---|---|
Similar structure data |
-Links
-Assembly
Deposited unit |
|
---|---|
1 |
|
-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) |
---|---|
#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: Spodoptera frugiperda (fall armyworm) / References: UniProt: P23588 |
#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 |
---|---|
#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: Escherichia coli (E. coli) |
#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 |
---|---|
#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 / |
---|
-Details
Has protein modification | Y |
---|
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
---|---|
EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component |
| ||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Molecular weight | Value: 2.0 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) |
| ||||||||||||||||||||||||||||||
Source (recombinant) |
| ||||||||||||||||||||||||||||||
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 |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
---|---|
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) |
-Processing
Software | Name: PHENIX / Version: 1.13_2998: / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
EM software |
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: 1 / Total: 32425 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refine LS restraints |
|