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Open data
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Basic information
| Entry | Database: PDB / ID: 7aqc | |||||||||
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| Title | Structure of the bacterial RQC complex (Decoding State) | |||||||||
Components |
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Keywords | RIBOSOME / rqch / rqc / rqc2 / hsp15 / fibronectin-binding protein / NEMF / ribosome-associated quality control / ribosome-associated / 50s / Alanine-tailing | |||||||||
| Function / homology | Function and homology informationRQC complex / positive regulation of rRNA processing / nucleoid / ribosomal large subunit binding / rescue of stalled ribosome / rRNA processing / large ribosomal subunit / transferase activity / 5S rRNA binding / ribosomal large subunit assembly ...RQC complex / positive regulation of rRNA processing / nucleoid / ribosomal large subunit binding / rescue of stalled ribosome / rRNA processing / large ribosomal subunit / transferase activity / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / structural constituent of ribosome / ribosome / translation / ribonucleoprotein complex / response to antibiotic / mRNA binding / DNA binding / RNA binding / cytoplasm Similarity search - Function | |||||||||
| Biological species | ![]() ![]() | |||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.99 Å | |||||||||
Authors | Filbeck, S. / Pfeffer, S. | |||||||||
| Funding support | Germany, United States, 2items
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Citation | Journal: Mol Cell / Year: 2021Title: Mimicry of Canonical Translation Elongation Underlies Alanine Tail Synthesis in RQC. Authors: Sebastian Filbeck / Federico Cerullo / Helge Paternoga / George Tsaprailis / Claudio A P Joazeiro / Stefan Pfeffer / ![]() Abstract: Aborted translation produces large ribosomal subunits obstructed with tRNA-linked nascent chains, which are substrates of ribosome-associated quality control (RQC). Bacterial RqcH, a widely conserved ...Aborted translation produces large ribosomal subunits obstructed with tRNA-linked nascent chains, which are substrates of ribosome-associated quality control (RQC). Bacterial RqcH, a widely conserved RQC factor, senses the obstruction and recruits tRNA to modify nascent-chain C termini with a polyalanine degron. However, how RqcH and its eukaryotic homologs (Rqc2 and NEMF), despite their relatively simple architecture, synthesize such C-terminal tails in the absence of a small ribosomal subunit and mRNA has remained unknown. Here, we present cryoelectron microscopy (cryo-EM) structures of Bacillus subtilis RQC complexes representing different Ala tail synthesis steps. The structures explain how tRNA is selected via anticodon reading during recruitment to the A-site and uncover striking hinge-like movements in RqcH leading tRNA into a hybrid A/P-state associated with peptidyl-transfer. Finally, we provide structural, biochemical, and molecular genetic evidence identifying the Hsp15 homolog (encoded by rqcP) as a novel RQC component that completes the cycle by stabilizing the P-site tRNA conformation. Ala tailing thus follows mechanistic principles surprisingly similar to canonical translation elongation. | |||||||||
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Structure visualization
| Movie |
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| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 7aqc.cif.gz | 2.1 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb7aqc.ent.gz | 1.6 MB | Display | PDB format |
| PDBx/mmJSON format | 7aqc.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 7aqc_validation.pdf.gz | 980.2 KB | Display | wwPDB validaton report |
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| Full document | 7aqc_full_validation.pdf.gz | 1 MB | Display | |
| Data in XML | 7aqc_validation.xml.gz | 128.5 KB | Display | |
| Data in CIF | 7aqc_validation.cif.gz | 229.1 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/aq/7aqc ftp://data.pdbj.org/pub/pdb/validation_reports/aq/7aqc | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 11862MC ![]() 7aqdC 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, 4 molecules ABPT
| #1: RNA chain | Mass: 914625.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() |
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| #2: RNA chain | Mass: 36157.520 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() References: GenBank: 1150402534 |
| #15: RNA chain | Mass: 24491.547 Da / Num. of mol.: 2 / Source method: isolated from a natural source Source: (natural) ![]() |
+50S ribosomal protein ... , 27 types, 27 molecules CDEFGIJKLMNOQSUVXZabcdefghi
-Protein , 2 types, 2 molecules RY
| #17: Protein | Mass: 65307.398 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() References: UniProt: O34693 |
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| #23: Protein | Mass: 9737.266 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() References: UniProt: P37557 |
-Protein/peptide , 1 types, 1 molecules W
| #21: Protein/peptide | Mass: 515.560 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) ![]() |
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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: Bacterial RQC complex / Type: RIBOSOME / Entity ID: all / Source: NATURAL |
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| Molecular weight | Experimental value: NO |
| Source (natural) | Organism: ![]() |
| Buffer solution | pH: 7.4 |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Specimen support | Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1 |
| Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE |
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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 / Alignment procedure: COMA FREE |
| Specimen holder | Cryogen: NITROGEN |
| Image recording | Electron dose: 45 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
| EM imaging optics | Energyfilter slit width: 20 eV |
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Processing
| Software | Name: PHENIX / Version: 1.18.2_3874: / Classification: refinement | ||||||||||||||||||||||||||||||||||||||||||||||||
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| EM software |
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||||||
| Particle selection | Num. of particles selected: 5869410 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||||||||||||||
| 3D reconstruction | Resolution: 2.99 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 138382 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||
| Atomic model building |
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| Refine LS restraints |
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Movie
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About Yorodumi






Germany,
United States, 2items
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