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Yorodumi- EMDB-51679: 70S ribosome with doublet-decoding tRNASer3 bound to A-site GCA codon -
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Open data
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Basic information
| Entry | ![]() | ||||||||||||
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| Title | 70S ribosome with doublet-decoding tRNASer3 bound to A-site GCA codon | ||||||||||||
Map data | Main map, unsharpened | ||||||||||||
Sample |
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Keywords | decoding / frame shift / translation / RIBOSOME | ||||||||||||
| Function / homology | Function and homology informationnegative regulation of cytoplasmic translational initiation / ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / 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 translational initiation / ornithine decarboxylase inhibitor activity / transcription antitermination factor activity, RNA binding / 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 / four-way junction DNA binding / DnaA-L2 complex / translation repressor activity / negative regulation of translational initiation / regulation of mRNA stability / negative regulation of DNA-templated DNA replication initiation / mRNA regulatory element binding translation repressor activity / assembly of large subunit precursor of preribosome / positive regulation of RNA splicing / ribosome assembly / regulation of DNA-templated transcription elongation / transcription elongation factor complex / cytosolic ribosome assembly / response to reactive oxygen species / DNA endonuclease activity / transcription antitermination / translational initiation / regulation of cell growth / DNA-templated transcription termination / response to radiation / maintenance of translational fidelity / mRNA 5'-UTR binding / ribosome biogenesis / large ribosomal subunit / regulation of translation / ribosome binding / transferase activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / 5S rRNA binding / small ribosomal subunit rRNA binding / ribosomal large subunit assembly / 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 / 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: 2.61 Å | ||||||||||||
Authors | Krishnaswamy S / Larsson DSD / Selmer M | ||||||||||||
| Funding support | Sweden, 3 items
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Citation | Journal: Nat Commun / Year: 2025Title: Doublet decoding of tRNA demonstrates plasticity of ribosomal decoding center. Authors: Shruthi Krishnaswamy / Shirin Akbar / Daniel S D Larsson / Yang Chen / Maria Selmer / ![]() Abstract: Frameshifts can be caused by specific combinations of tRNA and mRNA. The wildtype AGC-decoding E. coli tRNA has been shown to induce -1 ribosomal frameshifting on GCA alanine codons, and proposed to ...Frameshifts can be caused by specific combinations of tRNA and mRNA. The wildtype AGC-decoding E. coli tRNA has been shown to induce -1 ribosomal frameshifting on GCA alanine codons, and proposed to read a two-base codon instead of a canonical triplet. However, it has remained unclear whether this type of non-cognate decoding can be accommodated by the ribosome. Here, we perform single-particle cryo-EM reconstructions on E. coli 70S ribosomes with the frameshift-inducing tRNA bound to the non-cognate GCA codon or the cognate AGC codon in the ribosomal A site. The structures demonstrate that doublet decoding is made possible when A1493, the conserved monitoring base in 16S rRNA, mimics a first codon base, forming a Hoogsteen base pair with U36 from the anticodon and stacking with the mRNA. This interaction pushes the first two bases of the A-site codon in position for base pairing with C35 and G34 of the anticodon. | ||||||||||||
| History |
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Structure visualization
| Supplemental images |
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Downloads & links
-EMDB archive
| Map data | emd_51679.map.gz | 256.3 MB | EMDB map data format | |
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| Header (meta data) | emd-51679-v30.xml emd-51679.xml | 100.3 KB 100.3 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_51679_fsc.xml | 16.9 KB | Display | FSC data file |
| Images | emd_51679.png | 200.7 KB | ||
| Filedesc metadata | emd-51679.cif.gz | 16.4 KB | ||
| Others | emd_51679_additional_1.map.gz emd_51679_half_map_1.map.gz emd_51679_half_map_2.map.gz | 483.7 MB 474.9 MB 474.9 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-51679 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-51679 | HTTPS FTP |
-Validation report
| Summary document | emd_51679_validation.pdf.gz | 1.1 MB | Display | EMDB validaton report |
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| Full document | emd_51679_full_validation.pdf.gz | 1.1 MB | Display | |
| Data in XML | emd_51679_validation.xml.gz | 26.8 KB | Display | |
| Data in CIF | emd_51679_validation.cif.gz | 35.2 KB | Display | |
| Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51679 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51679 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9gxxMC ![]() 9h0lC 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_51679.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Main map, unsharpened | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.87457 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: B-factor sharpened map
| File | emd_51679_additional_1.map | ||||||||||||
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| Annotation | B-factor sharpened map | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Half map: Half-map A
| File | emd_51679_half_map_1.map | ||||||||||||
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| Annotation | Half-map A | ||||||||||||
| Projections & Slices |
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| Density Histograms |
-Half map: Half-map B
| File | emd_51679_half_map_2.map | ||||||||||||
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| Annotation | Half-map B | ||||||||||||
| Projections & Slices |
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| Density Histograms |
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Sample components
+Entire : 70S ribosome
+Supramolecule #1: 70S ribosome
+Macromolecule #1: 16S rRNA
+Macromolecule #22: tRNA(fMet)
+Macromolecule #23: mRNA
+Macromolecule #24: tRNA(Ser3)
+Macromolecule #25: 23S rRNA
+Macromolecule #26: 5S rRNA
+Macromolecule #2: Small ribosomal subunit protein uS2
+Macromolecule #3: Small ribosomal subunit protein uS3
+Macromolecule #4: Small ribosomal subunit protein uS4
+Macromolecule #5: Small ribosomal subunit protein uS5
+Macromolecule #6: Small ribosomal subunit protein bS6, fully modified isoform
+Macromolecule #7: Small ribosomal subunit protein uS7
+Macromolecule #8: Small ribosomal subunit protein uS8
+Macromolecule #9: Small ribosomal subunit protein uS9
+Macromolecule #10: Small ribosomal subunit protein uS10
+Macromolecule #11: Small ribosomal subunit protein uS11
+Macromolecule #12: Small ribosomal subunit protein uS12
+Macromolecule #13: Small ribosomal subunit protein uS13
+Macromolecule #14: Small ribosomal subunit protein uS14
+Macromolecule #15: Small ribosomal subunit protein uS15
+Macromolecule #16: Small ribosomal subunit protein bS16
+Macromolecule #17: Small ribosomal subunit protein uS17
+Macromolecule #18: Small ribosomal subunit protein bS18
+Macromolecule #19: Small ribosomal subunit protein uS19
+Macromolecule #20: Small ribosomal subunit protein bS20
+Macromolecule #21: Small ribosomal subunit protein bS21
+Macromolecule #27: Large ribosomal subunit protein uL2
+Macromolecule #28: Large ribosomal subunit protein uL3
+Macromolecule #29: Large ribosomal subunit protein uL4
+Macromolecule #30: Large ribosomal subunit protein uL5
+Macromolecule #31: Large ribosomal subunit protein uL6
+Macromolecule #32: Large ribosomal subunit protein bL9
+Macromolecule #33: Large ribosomal subunit protein uL13
+Macromolecule #34: Large ribosomal subunit protein uL14
+Macromolecule #35: Large ribosomal subunit protein uL15
+Macromolecule #36: Large ribosomal subunit protein uL16
+Macromolecule #37: Large ribosomal subunit protein bL17
+Macromolecule #38: Large ribosomal subunit protein uL18
+Macromolecule #39: Large ribosomal subunit protein bL19
+Macromolecule #40: Large ribosomal subunit protein bL20
+Macromolecule #41: Large ribosomal subunit protein bL21
+Macromolecule #42: Large ribosomal subunit protein uL22
+Macromolecule #43: Large ribosomal subunit protein uL23
+Macromolecule #44: Large ribosomal subunit protein uL24
+Macromolecule #45: Large ribosomal subunit protein bL25
+Macromolecule #46: Large ribosomal subunit protein bL27
+Macromolecule #47: Large ribosomal subunit protein bL28
+Macromolecule #48: Large ribosomal subunit protein uL29
+Macromolecule #49: Large ribosomal subunit protein uL30
+Macromolecule #50: Large ribosomal subunit protein bL32
+Macromolecule #51: Large ribosomal subunit protein bL33
+Macromolecule #52: Large ribosomal subunit protein bL34
+Macromolecule #53: Large ribosomal subunit protein bL35
+Macromolecule #54: Large ribosomal subunit protein bL36A
+Macromolecule #55: Large ribosomal subunit protein bL31A
+Macromolecule #56: MAGNESIUM ION
+Macromolecule #57: SPERMIDINE
+Macromolecule #58: 1,4-DIAMINOBUTANE
+Macromolecule #59: SPERMINE
+Macromolecule #60: ZINC 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: 7.5 Component:
Details: HEPES-polymix buffer (pH-7.5) | |||||||||||||||||||||||||||
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| Grid | Model: Quantifoil R2/2 / Material: COPPER / Mesh: 300 / Support film - #0 - Film type ID: 1 / Support film - #0 - Material: CARBON / Support film - #0 - topology: HOLEY / Support film - #1 - Film type ID: 2 / Support film - #1 - Material: CARBON / Support film - #1 - topology: CONTINUOUS / Support film - #1 - Film thickness: 2 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.04 kPa | |||||||||||||||||||||||||||
| Vitrification | Cryogen name: ETHANE / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
| Microscope | TFS GLACIOS |
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| Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Average electron dose: 28.29 e/Å2 |
| Electron beam | Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | C2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 190000 |
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Image processing
-Atomic model buiding 1
| Initial model |
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| Refinement | Space: REAL / Protocol: FLEXIBLE FIT / Overall B value: 114.14 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Output model | ![]() PDB-9gxx: |
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Keywords
Authors
Sweden, 3 items
Citation







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Y (Row.)
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FIELD EMISSION GUN




