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Yorodumi- EMDB-60059: Structure of the Bacterial Ribosome without hypoxia-induced rRNA ... -
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Basic information
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| Title | Structure of the Bacterial Ribosome without hypoxia-induced rRNA modifications | ||||||||||||
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Keywords | rRNA modifications / translation / RIBOSOME | ||||||||||||
| Function / homology | Function and homology informationnegative regulation of cytoplasmic translational initiation / transcription antitermination factor activity, RNA binding / ornithine decarboxylase inhibitor activity / 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 / transcription antitermination factor activity, RNA binding / ornithine decarboxylase inhibitor activity / misfolded RNA binding / Group I intron splicing / RNA folding / transcriptional attenuation / endoribonuclease inhibitor activity / positive regulation of ribosome biogenesis / RNA-binding transcription regulator activity / four-way junction DNA binding / negative regulation of cytoplasmic translation / DnaA-L2 complex / regulation of mRNA stability / translation repressor activity / negative regulation of translational initiation / negative regulation of DNA-templated DNA replication initiation / mRNA regulatory element binding translation repressor activity / regulation of DNA-templated transcription elongation / positive regulation of RNA splicing / transcription elongation factor complex / response to reactive oxygen species / cytosolic ribosome assembly / ribosome assembly / assembly of large subunit precursor of preribosome / transcription antitermination / DNA endonuclease activity / translational initiation / regulation of cell growth / DNA-templated transcription termination / response to radiation / maintenance of translational fidelity / mRNA 5'-UTR binding / regulation of translation / large ribosomal subunit / transferase activity / ribosomal small subunit assembly / ribosome biogenesis / ribosome binding / ribosomal small subunit biogenesis / 5S rRNA binding / ribosomal large subunit assembly / small ribosomal subunit / 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 / response to antibiotic / negative regulation of DNA-templated transcription / hydrolase activity / mRNA binding / DNA binding / RNA binding / zinc ion binding / membrane / cytoplasm / cytosol Similarity search - Function | ||||||||||||
| Biological species | ![]() Escherichia phage T4 (virus) | ||||||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.59 Å | ||||||||||||
Authors | Ishiguro K / Yokoyama T / Shirouzu M / Ito T / Suzuki T | ||||||||||||
| Funding support | Japan, 3 items
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Citation | Journal: Mol Cell / Year: 2026Title: Hypoxia-induced ribosomal RNA modifications in the peptidyl-transferase center contribute to anaerobic growth of bacteria. Authors: Kensuke Ishiguro / Karin Midorikawa / Naoki Shigi / Satoshi Kimura / Aivar Liiv / Takeshi Yokoyama / Takuhiro Ito / Mikako Shirouzu / Jaanus Remme / Kenjyo Miyauchi / Tsutomu Suzuki / ![]() Abstract: Ribosomal RNAs (rRNAs) contain various modifications that play critical roles in ribosome assembly and function. Here, we discovered two stereoselective methylations of the rRNA backbone in the ...Ribosomal RNAs (rRNAs) contain various modifications that play critical roles in ribosome assembly and function. Here, we discovered two stereoselective methylations of the rRNA backbone in the peptidyl-transferase center (PTC) of the 50S subunit of Escherichia coli cultured under anaerobic conditions. Methylation occurs at carbon 5'(S) of ribose moieties of dihydrouridine at position 2449 (Dm2449) and 2'-O-metylcytidine at position 2498 (Cmm2498). We identified the rlmX gene, encoding a cobalamin-dependent radical S-adenosylmethionine (SAM) methyltransferase responsible for these methylations. Intriguingly, Dm2449, Cmm2498, and 5-hydroxycytidine (hoC2501) in the PTC were elevated under anaerobic growth conditions. A double knockout strain lacking rlmX and rlhA (responsible for hoC2501) impaired anaerobic growth. Biochemical studies showed that these rRNA modifications stimulate protein synthesis. The cryoelectron microscopy (cryo-EM) structure of the ribosome indicated that these hypoxia-induced modifications stabilize the P-site and the PTC. These findings demonstrate that ribosomes are activated by hypoxia-induced modifications to enhance translational capability and thereby survival, under anaerobic conditions. | ||||||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_60059.map.gz | 524.6 MB | EMDB map data format | |
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| Header (meta data) | emd-60059-v30.xml emd-60059.xml | 90.5 KB 90.5 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_60059_fsc.xml | 18.7 KB | Display | FSC data file |
| Images | emd_60059.png | 96.9 KB | ||
| Filedesc metadata | emd-60059.cif.gz | 15.7 KB | ||
| Others | emd_60059_additional_1.map.gz emd_60059_half_map_1.map.gz emd_60059_half_map_2.map.gz | 451.2 MB 458 MB 458 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-60059 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-60059 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 8zffMC ![]() 8zfgC 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_60059.map.gz / Format: CCP4 / Size: 567.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.83 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Additional map: Before postprocess
| File | emd_60059_additional_1.map | ||||||||||||
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| Annotation | Before postprocess | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_60059_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #2
| File | emd_60059_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : The complex of E. coli 70S ribosome with mRNA and P- site tRNA
+Supramolecule #1: The complex of E. coli 70S ribosome with mRNA and P- site tRNA
+Supramolecule #2: E. coli 70S ribosome
+Supramolecule #3: mRNA and P- site tRNA
+Macromolecule #1: 16S rRNA
+Macromolecule #22: 23S rRNA
+Macromolecule #23: 5S rRNA
+Macromolecule #53: mRNA
+Macromolecule #54: P-site tRNA-fMet
+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 #24: Large ribosomal subunit protein uL2
+Macromolecule #25: Large ribosomal subunit protein uL3
+Macromolecule #26: Large ribosomal subunit protein uL4
+Macromolecule #27: Large ribosomal subunit protein uL5
+Macromolecule #28: Large ribosomal subunit protein uL6
+Macromolecule #29: Large ribosomal subunit protein bL9
+Macromolecule #30: Large ribosomal subunit protein uL13
+Macromolecule #31: Large ribosomal subunit protein uL14
+Macromolecule #32: Large ribosomal subunit protein uL15
+Macromolecule #33: Large ribosomal subunit protein uL16
+Macromolecule #34: Large ribosomal subunit protein bL17
+Macromolecule #35: Large ribosomal subunit protein uL18
+Macromolecule #36: Large ribosomal subunit protein bL19
+Macromolecule #37: Large ribosomal subunit protein bL20
+Macromolecule #38: Large ribosomal subunit protein bL21
+Macromolecule #39: Large ribosomal subunit protein uL22
+Macromolecule #40: Large ribosomal subunit protein uL23
+Macromolecule #41: Large ribosomal subunit protein uL24
+Macromolecule #42: Large ribosomal subunit protein bL25
+Macromolecule #43: Large ribosomal subunit protein bL27
+Macromolecule #44: Large ribosomal subunit protein bL28
+Macromolecule #45: Large ribosomal subunit protein uL29
+Macromolecule #46: Large ribosomal subunit protein uL30
+Macromolecule #47: Large ribosomal subunit protein bL32
+Macromolecule #48: Large ribosomal subunit protein bL33
+Macromolecule #49: Large ribosomal subunit protein bL34
+Macromolecule #50: Large ribosomal subunit protein bL35
+Macromolecule #51: Large ribosomal subunit protein bL36A
+Macromolecule #52: Large ribosomal subunit protein bL31
+Macromolecule #55: 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: 7.6 Component:
Details: The Buffer pH was adjusted to 7.6 using KOH. | |||||||||||||||
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| Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV | |||||||||||||||
| Details | 50nM ribosomes were incubated with 250nM tRNA and mRNA |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Image recording | Film or detector model: GATAN K3 (6k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 6057 / Average electron dose: 40.0 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 / Nominal magnification: 105000 |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Escherichia phage T4 (virus)
Authors
Japan, 3 items
Citation







Z (Sec.)
Y (Row.)
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Processing
FIELD EMISSION GUN


