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Yorodumi- EMDB-75676: Chimeric Escherichia coli 70S ribosome containing an evolved 16S ... -
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Open data
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Basic information
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| Title | Chimeric Escherichia coli 70S ribosome containing an evolved 16S rRNA from Pseudomonas aeruginosa (PA-ST) | |||||||||
Map data | Chimeric Escherichia coli 70S ribosome containing an evolved 16S rRNA from Pseudomonas aeruginosa (PA-ST) | |||||||||
Sample |
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Keywords | Directed evolution / translation / RIBOSOME | |||||||||
| Function / homology | Function and homology informationnegative regulation of cytoplasmic translational initiation / misfolded RNA binding / Group I intron splicing / RNA folding / transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity / negative regulation of cytoplasmic translation / DnaA-L2 complex ...negative regulation of cytoplasmic translational initiation / misfolded RNA binding / Group I intron splicing / RNA folding / transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity / negative regulation of cytoplasmic translation / DnaA-L2 complex / translation repressor activity / negative regulation of translational initiation / negative regulation of DNA-templated DNA replication initiation / mRNA regulatory element binding translation repressor activity / positive regulation of RNA splicing / cytosolic ribosome assembly / ribosome assembly / assembly of large subunit precursor of preribosome / transcription antitermination / translational initiation / regulation of cell growth / response to radiation / DNA-templated transcription termination / maintenance of translational fidelity / mRNA 5'-UTR binding / large ribosomal subunit / ribosomal small subunit assembly / transferase activity / ribosome binding / ribosomal small subunit biogenesis / 5S rRNA binding / small ribosomal subunit / ribosomal large subunit assembly / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / 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 / negative regulation of DNA-templated transcription / mRNA binding / DNA binding / RNA binding / zinc ion binding / membrane / cytoplasm / cytosol Similarity search - Function | |||||||||
| Biological species | ![]() | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.02 Å | |||||||||
Authors | Raskar T | |||||||||
| Funding support | United States, 2 items
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Citation | Journal: bioRxiv / Year: 2026Title: Structural adaptations for enhanced translation kinetics in evolved ribosomes. Authors: Tushar Raskar / Alan Costello / Ahmed H Badran / James S Fraser / ![]() Abstract: The ribosomal RNA sequence governs translation dynamics, yet understanding how changes beyond the conserved catalytic centers influence kinetics and protein yield remains limited. Using orthogonal ...The ribosomal RNA sequence governs translation dynamics, yet understanding how changes beyond the conserved catalytic centers influence kinetics and protein yield remains limited. Using orthogonal ribosome phage-assisted continuous evolution (oRibo-PACE), we recently reported chimeric ribosomes derived from , , and endowed with elevated translation rates as compared to their starting counterparts. Here, we structurally characterize these kinetically enhanced ribosomes using cryo-electron microscopy and uncover a potential relationship between 16S rRNA stability and translation efficiency. Compared to their naive starting points, evolved ribosomes exhibit extensive RNA structural adaptation, often introduced by mismatches at key helical junctions, which leads to local RNA-protein rearrangements and destabilizes non-canonical base pairs. Compensatory mutations that restore base-pairing stability and eliminate flexibility reduced translational activity to wild-type levels. Across trajectories, increased translational output correlates with subtle, localized changes in the 16S rRNA sequence that introduce limited structural destabilization at specific elements. Taken together, our work provides new insights into rRNA structural malleability and establishes principles for engineering ribosomes with altered translation properties. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_75676.map.gz | 476.1 MB | EMDB map data format | |
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| Header (meta data) | emd-75676-v30.xml emd-75676.xml | 78.8 KB 78.8 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_75676_fsc.xml | 23.3 KB | Display | FSC data file |
| Images | emd_75676.png | 106.6 KB | ||
| Filedesc metadata | emd-75676.cif.gz | 21.3 KB | ||
| Others | emd_75676_half_map_1.map.gz emd_75676_half_map_2.map.gz | 121.3 MB 121.4 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-75676 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-75676 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 11ggMC ![]() 11bqC ![]() 11dgC ![]() 11fvC M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_75676.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Chimeric Escherichia coli 70S ribosome containing an evolved 16S rRNA from Pseudomonas aeruginosa (PA-ST) | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.832 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: Half Map B
| File | emd_75676_half_map_1.map | ||||||||||||
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| Annotation | Half Map B | ||||||||||||
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| Density Histograms |
-Half map: Half Map A
| File | emd_75676_half_map_2.map | ||||||||||||
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| Annotation | Half Map A | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : Chimeric Escherichia coli 70S ribosome containing an evolved 16S ...
+Supramolecule #1: Chimeric Escherichia coli 70S ribosome containing an evolved 16S ...
+Macromolecule #1: 16S ribosomal RNA
+Macromolecule #19: 23S ribosomal RNA
+Macromolecule #21: 5S ribosomal RNA
+Macromolecule #2: Small ribosomal subunit protein uS19
+Macromolecule #3: Ribosomal protein L21
+Macromolecule #4: Small ribosomal subunit protein bS20
+Macromolecule #5: Large ribosomal subunit protein uL22
+Macromolecule #6: Small ribosomal subunit protein bS21
+Macromolecule #7: 50S ribosomal protein L23
+Macromolecule #8: 50S ribosomal protein L24
+Macromolecule #9: Small ribosomal subunit protein uS2
+Macromolecule #10: Large ribosomal subunit protein bL25
+Macromolecule #11: Small ribosomal subunit protein uS3
+Macromolecule #12: 50S ribosomal protein L27
+Macromolecule #13: Small ribosomal subunit protein uS4
+Macromolecule #14: 50S ribosomal protein L28
+Macromolecule #15: Small ribosomal subunit protein uS5
+Macromolecule #16: Large ribosomal subunit protein uL29
+Macromolecule #17: Small ribosomal subunit protein bS6
+Macromolecule #18: 50S ribosomal protein L30
+Macromolecule #20: 50S ribosomal protein L32
+Macromolecule #22: 50S ribosomal protein L33
+Macromolecule #23: 50S ribosomal protein L2
+Macromolecule #24: 50S ribosomal protein L34
+Macromolecule #25: Large ribosomal subunit protein uL3
+Macromolecule #26: 50S ribosomal protein L35
+Macromolecule #27: Large ribosomal subunit protein uL4
+Macromolecule #28: 50S ribosomal protein L36
+Macromolecule #29: Large ribosomal subunit protein uL5
+Macromolecule #30: Small ribosomal subunit protein uS7
+Macromolecule #31: Large ribosomal subunit protein uL6
+Macromolecule #32: Small ribosomal subunit protein uS8
+Macromolecule #33: Large ribosomal subunit protein bL9
+Macromolecule #34: Small ribosomal subunit protein uS9
+Macromolecule #35: 50S ribosomal protein L31
+Macromolecule #36: Small ribosomal subunit protein uS10
+Macromolecule #37: Large ribosomal subunit protein uL13
+Macromolecule #38: 30S ribosomal protein S11
+Macromolecule #39: Large ribosomal subunit protein uL14
+Macromolecule #40: 30S ribosomal protein S12
+Macromolecule #41: Large ribosomal subunit protein uL15
+Macromolecule #42: Small ribosomal subunit protein uS13
+Macromolecule #43: Large ribosomal subunit protein uL16
+Macromolecule #44: Small ribosomal subunit protein uS14
+Macromolecule #45: Large ribosomal subunit protein bL17
+Macromolecule #46: Small ribosomal subunit protein uS15
+Macromolecule #47: Large ribosomal subunit protein uL18
+Macromolecule #48: Small ribosomal subunit protein bS16
+Macromolecule #49: Large ribosomal subunit protein bL19
+Macromolecule #50: Small ribosomal subunit protein uS17
+Macromolecule #51: 50S ribosomal protein L20
+Macromolecule #52: Small ribosomal subunit protein bS18
+Macromolecule #53: MAGNESIUM ION
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 7.4 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 60.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Authors
United States, 2 items
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Processing
FIELD EMISSION GUN


