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Open data
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Basic information
Entry | Database: PDB / ID: 6ybs | ||||||||||||
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Title | Structure of a human 48S translational initiation complex - head | ||||||||||||
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![]() | TRANSLATION / ribosome / initiation complex | ||||||||||||
Function / homology | ![]() positive regulation of mRNA binding / viral translational termination-reinitiation / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / eukaryotic 43S preinitiation complex / mRNA cap binding / eukaryotic 48S preinitiation complex ...positive regulation of mRNA binding / viral translational termination-reinitiation / cap-dependent translational initiation / eukaryotic translation initiation factor 3 complex, eIF3m / IRES-dependent viral translational initiation / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / eukaryotic 43S preinitiation complex / mRNA cap binding / eukaryotic 48S preinitiation complex / 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 respiratory burst involved in inflammatory response / 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 / nucleolus organization / positive regulation of Golgi to plasma membrane protein transport / TNFR1-mediated ceramide production / negative regulation of DNA repair / supercoiled DNA binding / 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 / Formation of the ternary complex, and subsequently, the 43S complex / negative regulation of phagocytosis / erythrocyte homeostasis / cytoplasmic side of rough endoplasmic reticulum membrane / protein kinase A binding / 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 / fibroblast growth factor binding / negative regulation of Wnt signaling pathway / monocyte chemotaxis / negative regulation of translational frameshifting / BH3 domain binding / SARS-CoV-1 modulates host translation machinery / regulation of cell division / Peptide chain elongation / iron-sulfur cluster binding / 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 / Response of EIF2AK4 (GCN2) to amino acid deficiency / SRP-dependent cotranslational protein targeting to membrane / Viral mRNA Translation / negative regulation of respiratory burst involved in inflammatory response / 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 / 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) / spindle assembly / ribosomal small subunit export from nucleus / positive regulation of intrinsic apoptotic signaling pathway / translation regulator activity / signaling adaptor activity / gastrulation / Maturation of protein E / Maturation of protein E / MDM2/MDM4 family protein binding / positive regulation of microtubule polymerization / cytosolic ribosome / ER Quality Control Compartment (ERQC) / DNA-(apurinic or apyrimidinic site) endonuclease activity / rescue of stalled ribosome / Myoclonic epilepsy of Lafora / FLT3 signaling by CBL mutants / translation initiation factor activity / negative regulation of protein binding / negative regulation of protein ubiquitination / Prevention of phagosomal-lysosomal fusion / IRAK2 mediated activation of TAK1 complex / Alpha-protein kinase 1 signaling pathway / Glycogen synthesis / IRAK1 recruits IKK complex / IRAK1 recruits IKK complex upon TLR7/8 or 9 stimulation / positive regulation of GTPase activity / Membrane binding and targetting of GAG proteins / Endosomal Sorting Complex Required For Transport (ESCRT) / Regulation of TBK1, IKKε (IKBKE)-mediated activation of IRF3, IRF7 / Negative regulation of FLT3 Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å | ||||||||||||
![]() | Brito Querido, J. / Sokabe, M. / Kraatz, S. / Gordiyenko, Y. / Skehel, M. / Fraser, C. / Ramakrishnan, V. | ||||||||||||
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 | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 705 KB | Display | ![]() |
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PDB format | ![]() | 523.2 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 10772MC ![]() 6ybdC ![]() 6ybtC ![]() 6ybvC ![]() 6ybwC ![]() 6zmwC 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 3 subunit ... , 2 types, 2 molecules xo
#1: Protein | Mass: 64060.758 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#6: Protein | Mass: 35662.016 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Protein , 2 types, 2 molecules ck
#2: Protein | Mass: 35115.652 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#16: Protein | Mass: 18004.041 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-40S ribosomal protein ... , 13 types, 13 molecules nXhamibZdefVY
#3: Protein | Mass: 7855.052 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#4: Protein | Mass: 15578.156 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#5: Protein | Mass: 13398.763 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#7: Protein | Mass: 18933.846 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#8: Protein | Mass: 14538.987 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#9: Protein | Mass: 6690.821 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#10: Protein | Mass: 17076.207 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#11: Protein | Mass: 26729.369 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() References: UniProt: P23396, DNA-(apurinic or apyrimidinic site) lyase |
#12: Protein | Mass: 16091.562 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#13: Protein | Mass: 13776.224 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#14: Protein | Mass: 17759.777 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#15: Protein | Mass: 22913.453 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#17: Protein | Mass: 16477.377 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-RNA chain , 1 types, 1 molecules A
#18: RNA chain | Mass: 603130.375 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-Non-polymers , 2 types, 30 molecules 


#19: Chemical | ChemComp-MG / #20: Chemical | ChemComp-ZN / | |
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-Details
Has ligand of interest | 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
Component | Name: 48S initiation complex / Type: RIBOSOME / Entity ID: #1-#18 / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % |
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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 |
Image recording | Average exposure time: 1 sec. / Electron dose: 107 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON III (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 144882 / Symmetry type: POINT |