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Yorodumi- EMDB-51085: Assembly intermediate of human mitochondrial ribosome small subun... -
+ Open data
Open data
- Basic information
Basic information
| Entry |  | |||||||||||||||||||||
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| Title | Assembly intermediate of human mitochondrial ribosome small subunit (State C) | |||||||||||||||||||||
|  Map data | Composite map of state C | |||||||||||||||||||||
|  Sample | 
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|  Keywords | mitochondrial ribosomal small subunit / assembly intermediate / immature h44 / single-particle cryo-EM / RIBOSOME | |||||||||||||||||||||
| Function / homology |  Function and homology information rRNA (cytosine-N4-)-methyltransferase activity / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation termination / Mitochondrial translation initiation / negative regulation of mitotic nuclear division / rRNA base methylation / mitochondrial ribosome / mitochondrial small ribosomal subunit / mitochondrial translation ...rRNA (cytosine-N4-)-methyltransferase activity / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation termination / Mitochondrial translation initiation / negative regulation of mitotic nuclear division / rRNA base methylation / mitochondrial ribosome / mitochondrial small ribosomal subunit / mitochondrial translation / apoptotic mitochondrial changes / positive regulation of proteolysis / ribosomal small subunit binding / Mitochondrial protein degradation / Transferases; Transferring one-carbon groups; Methyltransferases / apoptotic signaling pathway / rRNA processing / cell junction / regulation of translation / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / nuclear membrane / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / tRNA binding / cell population proliferation / mitochondrial inner membrane / rRNA binding / structural constituent of ribosome / ribosome / translation / mitochondrial matrix / protein domain specific binding / intracellular membrane-bounded organelle / mRNA binding / GTP binding / nucleolus / mitochondrion / RNA binding / nucleoplasm / nucleus / plasma membrane / cytoplasm / cytosol Similarity search - Function | |||||||||||||||||||||
| Biological species |  Homo sapiens (human) | |||||||||||||||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.0 Å | |||||||||||||||||||||
|  Authors | Finke AF / Heinrichs M / Aibara S / Richter-Dennerlein R / Hillen HS | |||||||||||||||||||||
| Funding support |  Germany, European Union, 6 items 
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|  Citation |  Journal: Nat Commun / Year: 2025 Title: Coupling of ribosome biogenesis and translation initiation in human mitochondria. Authors: Marleen Heinrichs / Anna Franziska Finke / Shintaro Aibara / Angelique Krempler / Angela Boshnakovska / Peter Rehling / Hauke S Hillen / Ricarda Richter-Dennerlein /  Abstract: Biogenesis of mitoribosomes requires dedicated chaperones, RNA-modifying enzymes, and GTPases, and defects in mitoribosome assembly lead to severe mitochondriopathies in humans. Here, we characterize ...Biogenesis of mitoribosomes requires dedicated chaperones, RNA-modifying enzymes, and GTPases, and defects in mitoribosome assembly lead to severe mitochondriopathies in humans. Here, we characterize late-step assembly states of the small mitoribosomal subunit (mtSSU) by combining genetic perturbation and mutagenesis analysis with biochemical and structural approaches. Isolation of native mtSSU biogenesis intermediates via a FLAG-tagged variant of the GTPase MTG3 reveals three distinct assembly states, which show how factors cooperate to mature the 12S rRNA. In addition, we observe four distinct primed initiation mtSSU states with an incompletely matured rRNA, suggesting that biogenesis and translation initiation are not mutually exclusive processes but can occur simultaneously. Together, these results provide insights into mtSSU biogenesis and suggest a functional coupling between ribosome biogenesis and translation initiation in human mitochondria. | |||||||||||||||||||||
| History | 
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- Structure visualization
Structure visualization
| Supplemental images | 
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- Downloads & links
Downloads & links
-EMDB archive
| Map data |  emd_51085.map.gz | 155.7 MB |  EMDB map data format | |
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| Header (meta data) |  emd-51085-v30.xml  emd-51085.xml | 67.1 KB 67.1 KB | Display Display |  EMDB header | 
| Images |  emd_51085.png | 82.9 KB | ||
| Filedesc metadata |  emd-51085.cif.gz | 14.4 KB | ||
| Archive directory |  http://ftp.pdbj.org/pub/emdb/structures/EMD-51085  ftp://ftp.pdbj.org/pub/emdb/structures/EMD-51085 | HTTPS FTP | 
-Validation report
| Summary document |  emd_51085_validation.pdf.gz | 521.1 KB | Display |  EMDB validaton report | 
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| Full document |  emd_51085_full_validation.pdf.gz | 520.7 KB | Display | |
| Data in XML |  emd_51085_validation.xml.gz | 7.5 KB | Display | |
| Data in CIF |  emd_51085_validation.cif.gz | 8.7 KB | Display | |
| Arichive directory |  https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51085  ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-51085 | HTTPS FTP | 
-Related structure data
| Related structure data |  9g5dMC  9g5bC  9g5cC  9g5eC  9hfmC  9hfnC  9hfoC C: citing same article ( M: atomic model generated by this map | 
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| Similar structure data | Similarity search - Function & homology  F&H Search | 
- Links
Links
| EMDB pages |  EMDB (EBI/PDBe) /  EMDataResource | 
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| Related items in Molecule of the Month | 
- Map
Map
| File |  Download / File: emd_51085.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Composite map of state C | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
 
 Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.05 Å | ||||||||||||||||||||||||||||||||||||
| Density | 
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML: 
 | 
-Supplemental data
- Sample components
Sample components
+Entire : Assembly intermediate of human mitochondrial ribosome small subun...
+Supramolecule #1: Assembly intermediate of human mitochondrial ribosome small subun...
+Macromolecule #1: 28S ribosomal protein S34, mitochondrial
+Macromolecule #2: 28S ribosomal protein S35, mitochondrial
+Macromolecule #3: Aurora kinase A-interacting protein
+Macromolecule #4: Pentatricopeptide repeat domain-containing protein 3, mitochondrial
+Macromolecule #6: 28S ribosomal protein S2, mitochondrial
+Macromolecule #7: 28S ribosomal protein S24, mitochondrial
+Macromolecule #8: 28S ribosomal protein S5, mitochondrial
+Macromolecule #9: 28S ribosomal protein S6, mitochondrial
+Macromolecule #10: 28S ribosomal protein S7, mitochondrial
+Macromolecule #11: 28S ribosomal protein S9, mitochondrial
+Macromolecule #12: 28S ribosomal protein S10, mitochondrial
+Macromolecule #13: 28S ribosomal protein S11, mitochondrial
+Macromolecule #14: 28S ribosomal protein S12, mitochondrial
+Macromolecule #15: 28S ribosomal protein S14, mitochondrial
+Macromolecule #16: 28S ribosomal protein S15, mitochondrial
+Macromolecule #17: 28S ribosomal protein S16, mitochondrial
+Macromolecule #18: 28S ribosomal protein S17, mitochondrial
+Macromolecule #19: 28S ribosomal protein S18b, mitochondrial
+Macromolecule #20: 28S ribosomal protein S18c, mitochondrial
+Macromolecule #21: 28S ribosomal protein S21, mitochondrial
+Macromolecule #22: 28S ribosomal protein S22, mitochondrial
+Macromolecule #23: 28S ribosomal protein S23, mitochondrial
+Macromolecule #24: 28S ribosomal protein S25, mitochondrial
+Macromolecule #25: 28S ribosomal protein S26, mitochondrial
+Macromolecule #26: 28S ribosomal protein S27, mitochondrial
+Macromolecule #27: 28S ribosomal protein S28, mitochondrial
+Macromolecule #28: 28S ribosomal protein S29, mitochondrial
+Macromolecule #29: 28S ribosomal protein S31, mitochondrial
+Macromolecule #30: 28S ribosomal protein S33, mitochondrial
+Macromolecule #31: Putative ribosome-binding factor A, mitochondrial
+Macromolecule #32: 12S rRNA N4-methylcytidine (m4C) methyltransferase
+Macromolecule #5: 12S mitochondrial rRNA
+Macromolecule #33: MAGNESIUM ION
+Macromolecule #34: POTASSIUM ION
+Macromolecule #35: NICOTINAMIDE-ADENINE-DINUCLEOTIDE
+Macromolecule #36: ZINC ION
+Macromolecule #37: FE2/S2 (INORGANIC) CLUSTER
+Macromolecule #38: GUANOSINE-5'-DIPHOSPHATE
+Macromolecule #39: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #40: S-ADENOSYL-L-HOMOCYSTEINE
-Experimental details
-Structure determination
| Method | cryo EM | 
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|  Processing | single particle reconstruction | 
| Aggregation state | particle | 
- Sample preparation
Sample preparation
| Buffer | pH: 7.4 Component: 
 Details: 20mM HEPES-HCl, 100mM KCl, 20mM MgCl2, 0.02% DDM, 1mM PMSF, 1x protease-inhibitor mix, 0.5mM GMP-PNP | ||||||||||||||||||||||||
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| Grid | Model: Quantifoil R3.5/1 / Material: COPPER / 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 / Pretreatment - Type: GLOW DISCHARGE / Details: The grid was precoated with a 2-3 nm carbon layer. | ||||||||||||||||||||||||
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV | ||||||||||||||||||||||||
| Details | The sample was crosslinked with 0.15% glutaraldehyde for 10 min on ice. The reaction was stopped by adding 50 mM lysine pH 7.5 and 50 mM aspartate pH 7.5, and subsequently desalted against the final buffer prior to vitrification. | 
- Electron microscopy
Electron microscopy
| Microscope | TFS KRIOS | 
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| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average exposure time: 3.0 sec. / Average electron dose: 40.0 e/Å2 | 
| Electron beam | Acceleration voltage: 300 kV / Electron source:  FIELD EMISSION GUN | 
| Electron optics | Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 81000 | 
| Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN | 
| Experimental equipment |  Model: Titan Krios / Image courtesy: FEI Company | 
+ Image processing
Image processing
-Atomic model buiding 1
| Initial model | 
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| Refinement | Space: REAL / Protocol: RIGID BODY FIT | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Output model |  PDB-9g5d:  | 
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