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Yorodumi- PDB-9hc4: Cryo-EM structure of P. urativorans 70S ribosome with 2 copies of... -
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Open data
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Basic information
| Entry | Database: PDB / ID: 9hc4 | ||||||||||||||||||||||||||||||
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| Title | Cryo-EM structure of P. urativorans 70S ribosome with 2 copies of bS20. | ||||||||||||||||||||||||||||||
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Keywords | RIBOSOME / ribosome heterogeneity / functionally specialized ribosomes / polysome | ||||||||||||||||||||||||||||||
| Function / homology | Function and homology informationlarge ribosomal subunit / transferase activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit rRNA binding / large ribosomal subunit rRNA binding / cytosolic small ribosomal subunit ...large ribosomal subunit / transferase activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit rRNA binding / large ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / structural constituent of ribosome / ribosome / translation / ribonucleoprotein complex / mRNA binding / RNA binding / cytoplasm / cytosol Similarity search - Function | ||||||||||||||||||||||||||||||
| Biological species | Psychrobacter urativorans (bacteria) | ||||||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å | ||||||||||||||||||||||||||||||
Authors | Helena-Bueno, K. / Hill, C.H. / Melnikov, S.V. | ||||||||||||||||||||||||||||||
| Funding support | United Kingdom, 1items
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Citation | Journal: Nat Commun / Year: 2025Title: Structurally heterogeneous ribosomes cooperate in protein synthesis in bacterial cells. Authors: Karla Helena-Bueno / Sophie Kopetschke / Sebastian Filbeck / Lewis I Chan / Sonia Birsan / Arnaud Baslé / Maisie Hudson / Stefan Pfeffer / Chris H Hill / Sergey V Melnikov / ![]() Abstract: Ribosome heterogeneity is a paradigm in biology, pertaining to the existence of structurally distinct populations of ribosomes within a single organism or cell. This concept suggests that ...Ribosome heterogeneity is a paradigm in biology, pertaining to the existence of structurally distinct populations of ribosomes within a single organism or cell. This concept suggests that structurally distinct pools of ribosomes have different functional properties and may be used to translate specific mRNAs. However, it is unknown to what extent structural heterogeneity reflects genuine functional specialization rather than stochastic variations in ribosome assembly. Here, we address this question by combining cryo-electron microscopy and tomography to observe individual structurally heterogeneous ribosomes in bacterial cells. We show that 70% of ribosomes in Psychrobacter urativorans contain a second copy of the ribosomal protein bS20 at a previously unknown binding site on the large ribosomal subunit. We then determine that this second bS20 copy appears to be functionally neutral. This demonstrates that ribosome heterogeneity does not necessarily lead to functional specialization, even when it involves significant variations such as the presence or absence of a ribosomal protein. Instead, we show that heterogeneous ribosomes can cooperate in general protein synthesis rather than specialize in translating discrete populations of mRNA. | ||||||||||||||||||||||||||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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| PDBx/mmCIF format | 9hc4.cif.gz | 3 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb9hc4.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 9hc4.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 9hc4_validation.pdf.gz | 1.8 MB | Display | wwPDB validaton report |
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| Full document | 9hc4_full_validation.pdf.gz | 1.9 MB | Display | |
| Data in XML | 9hc4_validation.xml.gz | 201.1 KB | Display | |
| Data in CIF | 9hc4_validation.cif.gz | 354.2 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/hc/9hc4 ftp://data.pdbj.org/pub/pdb/validation_reports/hc/9hc4 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 52036MC M: map data used to model this data C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
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Assembly
| Deposited unit | ![]()
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Components
-Small ribosomal subunit protein ... , 20 types, 21 molecules FR3A4E5L6FGHKOLMMSPBQGSCTKUNVJYQZPjDmToA
| #1: Protein | Mass: 14278.470 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4T6M9 |
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| #3: Protein | Mass: 8973.312 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M5MK69 |
| #4: Protein | Mass: 29465.469 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4TFJ4 |
| #5: Protein | Mass: 18192.918 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M3V8J0 |
| #6: Protein | Mass: 13753.143 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4U4C3 |
| #15: Protein | Mass: 15839.572 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4U628 |
| #19: Protein | Mass: 11777.817 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M3V8P8 |
| #20: Protein | Mass: 10218.672 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4TF29 |
| #21: Protein | Mass: 13244.396 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M5MJL8 |
| #23: Protein | Mass: 10336.156 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4TUJ8 |
| #24: Protein | Mass: 14086.257 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4U618 |
| #26: Protein | Mass: 17760.559 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M3V8N5 |
| #27: Protein | Mass: 27120.340 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4T6V9 |
| #28: Protein | Mass: 13676.589 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M3V8P6 |
| #29: Protein | Mass: 8548.242 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4SY21 |
| #32: Protein | Mass: 11635.426 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4TE68 |
| #33: Protein | Mass: 10362.991 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4U401 |
| #43: Protein | Mass: 9955.363 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4T275 |
| #46: Protein | Mass: 24279.043 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4TE52 |
| #48: Protein | Mass: 9980.646 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: UniProt: A0A0M4T3R2 |
+Large ribosomal subunit protein ... , 29 types, 29 molecules C1F7E9aAMBUCWDXERFVHTIfJPOGRYWIXBaQbNcKdJeAfLgdhOibkClSnep
-RNA chain , 3 types, 3 molecules D8iNZ2
| #50: RNA chain | Mass: 36948.945 Da / Num. of mol.: 1 / Mutation: insertion of 85, C89A / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: GenBank: 930356181 |
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| #51: RNA chain | Mass: 514644.531 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) |
| #52: RNA chain | Mass: 933563.125 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Psychrobacter urativorans (bacteria) / References: GenBank: 930356181 |
-Details
| Has protein modification | N |
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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: 70S ribosome / Type: RIBOSOME / Entity ID: all / Source: NATURAL |
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| Source (natural) | Organism: Psychrobacter urativorans (bacteria) |
| Buffer solution | pH: 7.5 |
| Specimen | Conc.: 0.75 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
| Microscopy | Model: TFS GLACIOS |
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| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1250 nm / Nominal defocus min: 500 nm |
| Image recording | Electron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
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Processing
| EM software | Name: PHENIX / Version: 1.18.2_3874: / Category: model refinement |
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
| 3D reconstruction | Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 19576 / Symmetry type: POINT |
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Psychrobacter urativorans (bacteria)
United Kingdom, 1items
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FIELD EMISSION GUN