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Yorodumi- PDB-9qeg: Cryo-EM structure of the 70S ribosome of a MLSb sensitive S. aure... -
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Open data
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Basic information
| Entry | Database: PDB / ID: 9qeg | ||||||
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| Title | Cryo-EM structure of the 70S ribosome of a MLSb sensitive S. aureus strain "KES34" in complex with solithromycin | ||||||
Components |
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Keywords | RIBOSOME / resistance / rRNA / antibiotic | ||||||
| Function / homology | Function and homology informationlarge ribosomal subunit / transferase activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit / 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 / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit / 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 / zinc ion binding / cytosol / cytoplasm Similarity search - Function | ||||||
| Biological species | Staphylococcus aureus subsp. aureus USA300 (bacteria) | ||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.21 Å | ||||||
Authors | Rivalta, A. / Yonath, A. | ||||||
| Funding support | 1items
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Citation | Journal: Life Sci Alliance / Year: 2025Title: Structural studies on ribosomes of differentially macrolide-resistant strains. Authors: André Rivalta / Aliza Fedorenko / Alexandre Le Scornet / Sophie Thompson / Yehuda Halfon / Elinor Breiner Goldstein / Sude Çavdaroglu / Tal Melenitzky / Disha-Gajanan Hiregange / Ella ...Authors: André Rivalta / Aliza Fedorenko / Alexandre Le Scornet / Sophie Thompson / Yehuda Halfon / Elinor Breiner Goldstein / Sude Çavdaroglu / Tal Melenitzky / Disha-Gajanan Hiregange / Ella Zimmerman / Anat Bashan / Mee-Ngan Frances Yap / Ada Yonath / ![]() Abstract: Antimicrobial resistance is a major global health challenge, diminishing the efficacy of many antibiotics, including macrolides. In , an opportunistic pathogen, macrolide resistance is primarily ...Antimicrobial resistance is a major global health challenge, diminishing the efficacy of many antibiotics, including macrolides. In , an opportunistic pathogen, macrolide resistance is primarily mediated by Erm-family methyltransferases, which mono- or dimethylate A2058 in the 23S ribosomal RNA, reducing drug binding. Although macrolide-ribosome interactions have been characterized in nonpathogenic species, their structural basis in clinically relevant pathogens remains limited. In this study, we investigate the impact of -mediated resistance on drug binding by analyzing ribosomes from strains with varying levels of expression and activity. Using cryo-electron microscopy, we determined the high-resolution structures of solithromycin-bound ribosomes, including those with dimethylated A2058. Our structural analysis reveals the specific interactions that enable solithromycin binding despite double methylation and resistance, as corroborated by microbiological and biochemical data, suggesting that further optimization of ketolide-ribosome interactions could enhance macrolide efficacy against resistant strains. | ||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 9qeg.cif.gz | 4 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb9qeg.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 9qeg.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/qe/9qeg ftp://data.pdbj.org/pub/pdb/validation_reports/qe/9qeg | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 53066MC ![]() 9qehC C: citing same article ( M: map data used to model this data |
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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
+Large ribosomal subunit protein ... , 27 types, 27 molecules 1234CDEGHIJKLMNOPQRSUVWXZF13
-RNA chain , 7 types, 7 molecules B11AAad89
| #5: RNA chain | Mass: 36975.930 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: GenBank: 1335862171 |
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| #29: RNA chain | Mass: 4804.961 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria) |
| #30: RNA chain | Mass: 946822.750 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria) |
| #41: RNA chain | Mass: 502199.656 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: GenBank: 1733371935 |
| #51: RNA chain | Mass: 6165.746 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria) |
| #52: RNA chain | Mass: 22913.701 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria) |
| #53: RNA chain | Mass: 1554.008 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria) |
-Protein , 1 types, 1 molecules T
| #22: Protein | Mass: 23810.609 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FJE0 |
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-Small ribosomal subunit protein ... , 19 types, 19 molecules AeAfAgAiAlAoApAqArAtAjAcAmAkAbAhAdAnAs
| #31: Protein | Mass: 17770.512 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEQ6 |
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| #32: Protein | Mass: 11613.146 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FJP8 |
| #33: Protein | Mass: 17826.555 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FJ94 |
| #34: Protein | Mass: 14856.987 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FES2 |
| #35: Protein | Mass: 15320.870 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FJ95 |
| #36: Protein | Mass: 10634.330 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FHG5 |
| #37: Protein | Mass: 10253.886 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FHK0 |
| #38: Protein | Mass: 10196.888 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEP8 |
| #39: Protein | Mass: 9332.018 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FJP6 |
| #40: Protein | Mass: 9039.472 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FGD8 |
| #42: Protein | Mass: 11598.503 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEN8 |
| #43: Protein | Mass: 24143.867 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEP5 |
| #44: Protein | Mass: 13747.919 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FER3 |
| #45: Protein | Mass: 13907.978 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FER4 |
| #46: Protein | Mass: 29136.369 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FHI2 |
| #47: Protein | Mass: 14854.315 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEQ3 |
| #48: Protein | Mass: 23051.416 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FG18 |
| #49: Protein | Mass: 7317.769 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEQ2 |
| #50: Protein | Mass: 10639.309 Da / Num. of mol.: 1 / Source method: isolated from a natural source Source: (natural) Staphylococcus aureus subsp. aureus USA300 (bacteria)References: UniProt: Q2FEP3 |
-Non-polymers , 5 types, 875 molecules 








| #55: Chemical | ChemComp-ZN / #56: Chemical | ChemComp-MG / #57: Chemical | ChemComp-EM1 / ( | #58: Chemical | ChemComp-K / #59: Water | ChemComp-HOH / | |
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-Details
| Has ligand of interest | Y |
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| Has protein modification | N |
-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: Cryo-EM structure of the 70S ribosome of a MLSb sensitive S. aureus strain "KES34" in complex with solithromycin Type: RIBOSOME / Entity ID: #1-#54 / Source: NATURAL |
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| Source (natural) | Organism: Staphylococcus aureus subsp. aureus USA300 (bacteria) |
| Buffer solution | pH: 7.5 |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Specimen support | Grid type: Quantifoil R2/2 |
| 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: TFS KRIOS |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 500 nm |
| Image recording | Electron dose: 1 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
| 3D reconstruction | Resolution: 2.21 Å / Resolution method: OTHER / Num. of particles: 408831 Details: FSC (model) = 0.5 unmasked resolution calculated using PHENIX Mtriage and the composite map and the model. Symmetry type: POINT | ||||||||||||||||||||||||
| Refinement | Cross valid method: NONE Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2 | ||||||||||||||||||||||||
| Displacement parameters | Biso mean: 29.07 Å2 | ||||||||||||||||||||||||
| Refine LS restraints |
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Staphylococcus aureus subsp. aureus USA300 (bacteria)
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