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Open data
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Basic information
| Entry | Database: PDB / ID: 3j7q | |||||||||||||||
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| Title | Structure of the idle mammalian ribosome-Sec61 complex | |||||||||||||||
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Keywords | RIBOSOME / mammalian / Sec61 / translocation / translation | |||||||||||||||
| Function / homology | Function and homology informationregulation of cell cycle => GO:0051726 / regulation of cell cycle => GO:0051726 / : / L13a-mediated translational silencing of Ceruloplasmin expression / SRP-dependent cotranslational protein targeting to membrane / Major pathway of rRNA processing in the nucleolus and cytosol / Formation of a pool of free 40S subunits / GTP hydrolysis and joining of the 60S ribosomal subunit / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) ...regulation of cell cycle => GO:0051726 / regulation of cell cycle => GO:0051726 / : / L13a-mediated translational silencing of Ceruloplasmin expression / SRP-dependent cotranslational protein targeting to membrane / Major pathway of rRNA processing in the nucleolus and cytosol / Formation of a pool of free 40S subunits / GTP hydrolysis and joining of the 60S ribosomal subunit / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / protein-transporting ATPase activity / translation at presynapse / embryonic brain development / protein-DNA complex disassembly / alpha-beta T cell differentiation / cytoplasmic side of rough endoplasmic reticulum membrane / organelle membrane / ubiquitin ligase inhibitor activity / cellular response to actinomycin D / negative regulation of ubiquitin-dependent protein catabolic process / positive regulation of signal transduction by p53 class mediator / protein localization to nucleus / membrane => GO:0016020 / protein targeting / rough endoplasmic reticulum / translation regulator activity / negative regulation of proteasomal ubiquitin-dependent protein catabolic process / cytosolic ribosome / ribosomal large subunit biogenesis / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / modification-dependent protein catabolic process / transcription coactivator binding / protein tag activity / cytoplasmic ribonucleoprotein granule / rRNA processing / presynapse / heparin binding / protein transport / regulation of translation / large ribosomal subunit / ribosome biogenesis / 5S rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / postsynaptic density / rRNA binding / protein stabilization / protein ubiquitination / structural constituent of ribosome / ribosome / translation / ribonucleoprotein complex / intracellular membrane-bounded organelle / mRNA binding / positive regulation of cell population proliferation / synapse / ubiquitin protein ligase binding / positive regulation of gene expression / nucleolus / glutamatergic synapse / endoplasmic reticulum / negative regulation of transcription by RNA polymerase II / RNA binding / nucleoplasm / metal ion binding / nucleus / cytoplasm Similarity search - Function | |||||||||||||||
| Biological species | ![]() | |||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | |||||||||||||||
Authors | Voorhees, R.M. / Fernandez, I.S. / Scheres, S.H.W. / Hegde, R.S. | |||||||||||||||
Citation | Journal: Cell / Year: 2014Title: Structure of the mammalian ribosome-Sec61 complex to 3.4 Å resolution. Authors: Rebecca M Voorhees / Israel S Fernández / Sjors H W Scheres / Ramanujan S Hegde / ![]() Abstract: Cotranslational protein translocation is a universally conserved process for secretory and membrane protein biosynthesis. Nascent polypeptides emerging from a translating ribosome are either ...Cotranslational protein translocation is a universally conserved process for secretory and membrane protein biosynthesis. Nascent polypeptides emerging from a translating ribosome are either transported across or inserted into the membrane via the ribosome-bound Sec61 channel. Here, we report structures of a mammalian ribosome-Sec61 complex in both idle and translating states, determined to 3.4 and 3.9 Å resolution. The data sets permit building of a near-complete atomic model of the mammalian ribosome, visualization of A/P and P/E hybrid-state tRNAs, and analysis of a nascent polypeptide in the exit tunnel. Unprecedented chemical detail is observed for both the ribosome-Sec61 interaction and the conformational state of Sec61 upon ribosome binding. Comparison of the maps from idle and translating complexes suggests how conformational changes to the Sec61 channel could facilitate translocation of a secreted polypeptide. The high-resolution structure of the mammalian ribosome-Sec61 complex provides a valuable reference for future functional and structural studies. | |||||||||||||||
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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 | 3j7q.cif.gz | 3.5 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb3j7q.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 3j7q.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 3j7q_validation.pdf.gz | 1.2 MB | Display | wwPDB validaton report |
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| Full document | 3j7q_full_validation.pdf.gz | 1.5 MB | Display | |
| Data in XML | 3j7q_validation.xml.gz | 233.8 KB | Display | |
| Data in CIF | 3j7q_validation.cif.gz | 397.1 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/j7/3j7q ftp://data.pdbj.org/pub/pdb/validation_reports/j7/3j7q | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 2650MC ![]() 2644C ![]() 2646C ![]() 2649C ![]() 3j7oC ![]() 3j7pC ![]() 3j7rC C: citing same article ( M: map data used to model this data |
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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
-RNA chain , 3 types, 3 molecules 578
| #1: RNA chain | Mass: 1206101.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #2: RNA chain | Mass: 38691.914 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
| #3: RNA chain | Mass: 50143.648 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
+Ribosomal protein ... , 42 types, 42 molecules ABCDEFGHIJLMNOPQRSTUVWXYZabcde...
-Protein , 2 types, 2 molecules 12
| #46: Protein | Mass: 52279.379 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #47: Protein | Mass: 7752.325 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Protein/peptide , 1 types, 1 molecules 3
| #48: Protein/peptide | Mass: 3081.790 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-Non-polymers , 2 types, 133 molecules 


| #49: Chemical | ChemComp-MG / #50: Chemical | |
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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
| Component | Name: The ribosome-Sec61 complex purified from porcine pancreas Type: RIBOSOME |
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| Buffer solution | Name: 50 mM HEPES, 200 mM potassium acetate, 15 mM magnesium acetate, 1 mM DTT, 0.25% Digitonin pH: 7.5 Details: 50 mM HEPES, 200 mM potassium acetate, 15 mM magnesium acetate, 1 mM DTT, 0.25% Digitonin |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Specimen support | Details: Quantifoil R2/2 400 mesh copper grids |
| Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Temp: 120 K Details: 3 uL sample was incubated on the grid for 30 seconds and blotted for 9 seconds before being plunged into liquid ethane (FEI VITROBOT MARK IV). |
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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 / Date: Apr 7, 2014 |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER |
| Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 59000 X / Calibrated magnification: 104478 X / Nominal defocus max: 3500 nm / Nominal defocus min: 2500 nm / Cs: 2.7 mm |
| Specimen holder | Specimen holder type: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature: 70 K / Tilt angle max: 0 ° / Tilt angle min: 0 ° |
| Image recording | Electron dose: 27 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) / Details: Back-thinned |
| Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
| Radiation wavelength | Relative weight: 1 |
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Processing
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| CTF correction | Details: Each particle | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3D reconstruction | Method: Single particle / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 80019 / Nominal pixel size: 1.34 Å / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Atomic model building | B value: 37 / Protocol: OTHER / Space: RECIPROCAL / Target criteria: R-factor and FSC / Details: METHOD--Maximum likelihood | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Atomic model building |
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| Refinement | Resolution: 3.4→3.4 Å / Cor.coef. Fo:Fc: 0.856 / SU B: 22.493 / SU ML: 0.34 / σ(F): 0 / ESU R: 0.873 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 max: 83.35 Å2 / Biso mean: 48.645 Å2 / Biso min: 14.64 Å2
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| Refine LS restraints |
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| LS refinement shell | Resolution: 3.5→3.591 Å / Total num. of bins used: 20
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