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- EMDB-10769: Structure of a human 48S translational initiation complex - eIF3 -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-10769 | ||||||||||||
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Title | Structure of a human 48S translational initiation complex - eIF3 | ||||||||||||
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![]() | eIF3 / ribosome / translation / initiation complex | ||||||||||||
Function / homology | ![]() positive regulation of mRNA binding / viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3e / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / translation reinitiation / IRES-dependent viral translational initiation / multi-eIF complex / eukaryotic translation initiation factor 3 complex / eukaryotic 43S preinitiation complex ...positive regulation of mRNA binding / viral translational termination-reinitiation / eukaryotic translation initiation factor 3 complex, eIF3e / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / translation reinitiation / IRES-dependent viral translational initiation / multi-eIF complex / eukaryotic translation initiation factor 3 complex / eukaryotic 43S preinitiation complex / cytoplasmic translational initiation / mRNA cap binding / formation of cytoplasmic translation initiation complex / eukaryotic 48S preinitiation complex / negative regulation of RNA splicing / metal-dependent deubiquitinase activity / neural crest cell differentiation / regulation of translational initiation / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / positive regulation of ubiquitin-protein transferase activity / Formation of the ternary complex, and subsequently, the 43S complex / rRNA modification in the nucleus and cytosol / erythrocyte homeostasis / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / Translation initiation complex formation / Ribosomal scanning and start codon recognition / negative regulation of ubiquitin protein ligase activity / fibroblast growth factor binding / protein deubiquitination / SARS-CoV-1 modulates host translation machinery / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / Peptide chain elongation / Selenocysteine synthesis / ubiquitin ligase inhibitor activity / Formation of a pool of free 40S subunits / Eukaryotic Translation Termination / Response of EIF2AK4 (GCN2) to amino acid deficiency / SRP-dependent cotranslational protein targeting to membrane / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Viral mRNA Translation / negative regulation of proteasomal ubiquitin-dependent protein catabolic process / L13a-mediated translational silencing of Ceruloplasmin expression / GTP hydrolysis and joining of the 60S ribosomal subunit / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Major pathway of rRNA processing in the nucleolus and cytosol / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / translation regulator activity / Protein methylation / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / cytosolic ribosome / Mitotic Prometaphase / laminin binding / rough endoplasmic reticulum / endonucleolytic cleavage in ITS1 to separate SSU-rRNA from 5.8S rRNA and LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / EML4 and NUDC in mitotic spindle formation / negative regulation of translational initiation / translation initiation factor binding / Resolution of Sister Chromatid Cohesion / translational initiation / translation initiation factor activity / negative regulation of ubiquitin-dependent protein catabolic process / 90S preribosome / erythrocyte differentiation / maturation of SSU-rRNA / mRNA 3'-UTR binding / neural tube closure / positive regulation of translation / RHO GTPases Activate Formins / small-subunit processome / negative regulation of ERK1 and ERK2 cascade / receptor tyrosine kinase binding / PML body / fibrillar center / RMTs methylate histone arginines / mRNA 5'-UTR binding / Regulation of expression of SLITs and ROBOs / rRNA processing / Separation of Sister Chromatids / metallopeptidase activity / ribosome binding / virus receptor activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / SARS-CoV-2 modulates host translation machinery / cytosolic small ribosomal subunit / microtubule / ubiquitinyl hydrolase 1 / cysteine-type deubiquitinase activity / cytoplasmic translation / postsynaptic density / cell differentiation / protein stabilization / ribosome / structural constituent of ribosome / ribonucleoprotein complex / cadherin binding / translation Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.3 Å | ||||||||||||
![]() | Brito Querido J / Sokabe M | ||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() 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 |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 11.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 37.9 KB 37.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 17.7 KB | Display | ![]() |
Images | ![]() | 56 KB | ||
Masks | ![]() | 83.7 MB | ![]() | |
Filedesc metadata | ![]() | 10 KB | ||
Others | ![]() ![]() ![]() | 64.3 MB 64.6 MB 64.6 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 422.2 KB | Display | ![]() |
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Full document | ![]() | 421.4 KB | Display | |
Data in XML | ![]() | 18.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6ybdMC ![]() 6ybsC ![]() 6ybtC ![]() 6ybvC ![]() 6ybwC ![]() 6zmwC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 1.074 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
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Density Histograms |
-Additional map: #1
File | emd_10769_additional.map | ||||||||||||
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Density Histograms |
-Half map: #1
File | emd_10769_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_10769_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : 48S initiation complex
+Supramolecule #1: 48S initiation complex
+Macromolecule #1: Eukaryotic translation initiation factor 3 subunit M
+Macromolecule #2: Eukaryotic translation initiation factor 3 subunit F
+Macromolecule #3: Eukaryotic translation initiation factor 3 subunit A
+Macromolecule #4: Eukaryotic translation initiation factor 3 subunit E
+Macromolecule #5: Eukaryotic translation initiation factor 3 subunit C
+Macromolecule #6: Eukaryotic translation initiation factor 3 subunit H
+Macromolecule #7: 40S ribosomal protein S7
+Macromolecule #8: 40S ribosomal protein S27
+Macromolecule #9: 40S ribosomal protein S21
+Macromolecule #10: 40S ribosomal protein S17
+Macromolecule #11: 40S ribosomal protein S2
+Macromolecule #12: 40S ribosomal protein S3a
+Macromolecule #13: 40S ribosomal protein SA
+Macromolecule #14: 40S ribosomal protein S26
+Macromolecule #15: 40S ribosomal protein S14
+Macromolecule #16: 40S ribosomal protein S13
+Macromolecule #17: Eukaryotic translation initiation factor 3 subunit D
+Macromolecule #18: Eukaryotic translation initiation factor 3 subunit K
+Macromolecule #19: Eukaryotic translation initiation factor 3 subunit L
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film 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 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |