+Open data
-Basic information
Entry | Database: PDB / ID: 7po3 | ||||||||||||
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Title | Human mitochondrial ribosome small subunit | ||||||||||||
Components |
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Keywords | RIBOSOME / Small subunit / mitochondrion | ||||||||||||
Function / homology | Function and homology information mitochondrial ribosome binding / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation termination / Mitochondrial translation initiation / positive regulation of mitochondrial translation / negative regulation of mitotic nuclear division / mitochondrial ribosome / mitochondrial small ribosomal subunit / mitochondrial translation ...mitochondrial ribosome binding / mitochondrial ribosome assembly / Mitochondrial translation elongation / Mitochondrial translation termination / Mitochondrial translation initiation / positive regulation of mitochondrial translation / negative regulation of mitotic nuclear division / mitochondrial ribosome / mitochondrial small ribosomal subunit / mitochondrial translation / positive regulation of proteolysis / ribosomal small subunit binding / Mitochondrial protein degradation / apoptotic signaling pathway / fibrillar center / small ribosomal subunit rRNA binding / cell junction / regulation of translation / ribosomal small subunit assembly / small ribosomal subunit / nuclear membrane / cell population proliferation / tRNA binding / mitochondrial inner membrane / rRNA binding / ribosome / structural constituent of ribosome / mitochondrial matrix / translation / protein domain specific binding / intracellular membrane-bounded organelle / mRNA binding / nucleolus / GTP binding / mitochondrion / RNA binding / nucleoplasm / nucleus / plasma membrane / cytosol / cytoplasm Similarity search - Function | ||||||||||||
Biological species | Homo sapiens (human) | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.92 Å | ||||||||||||
Authors | Itoh, Y. / Khawaja, A. / Rorbach, J. / Amunts, A. | ||||||||||||
Funding support | European Union, 3items
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Citation | Journal: Nature / Year: 2022 Title: Mechanism of mitoribosomal small subunit biogenesis and preinitiation. Authors: Yuzuru Itoh / Anas Khawaja / Ivan Laptev / Miriam Cipullo / Ilian Atanassov / Petr Sergiev / Joanna Rorbach / Alexey Amunts / Abstract: Mitoribosomes are essential for the synthesis and maintenance of bioenergetic proteins. Here we use cryo-electron microscopy to determine a series of the small mitoribosomal subunit (SSU) ...Mitoribosomes are essential for the synthesis and maintenance of bioenergetic proteins. Here we use cryo-electron microscopy to determine a series of the small mitoribosomal subunit (SSU) intermediates in complex with auxiliary factors, revealing a sequential assembly mechanism. The methyltransferase TFB1M binds to partially unfolded rRNA h45 that is promoted by RBFA, while the mRNA channel is blocked. This enables binding of METTL15 that promotes further rRNA maturation and a large conformational change of RBFA. The new conformation allows initiation factor mtIF3 to already occupy the subunit interface during the assembly. Finally, the mitochondria-specific ribosomal protein mS37 (ref. ) outcompetes RBFA to complete the assembly with the SSU-mS37-mtIF3 complex that proceeds towards mtIF2 binding and translation initiation. Our results explain how the action of step-specific factors modulate the dynamic assembly of the SSU, and adaptation of a unique protein, mS37, links the assembly to initiation to establish the catalytic human mitoribosome. | ||||||||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7po3.cif.gz | 2.6 MB | Display | PDBx/mmCIF format |
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PDB format | pdb7po3.ent.gz | Display | PDB format | |
PDBx/mmJSON format | 7po3.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 7po3_validation.pdf.gz | 1.7 MB | Display | wwPDB validaton report |
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Full document | 7po3_full_validation.pdf.gz | 1.7 MB | Display | |
Data in XML | 7po3_validation.xml.gz | 161.9 KB | Display | |
Data in CIF | 7po3_validation.cif.gz | 271.1 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/po/7po3 ftp://data.pdbj.org/pub/pdb/validation_reports/po/7po3 | HTTPS FTP |
-Related structure data
Related structure data | 13561MC 7pntC 7pnuC 7pnvC 7pnwC 7pnxC 7pnyC 7pnzC 7po0C 7po1C 7po2C 7po4C M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
-RNA chain , 1 types, 1 molecules A
#1: RNA chain | Mass: 306547.531 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: cell / Source: (natural) Homo sapiens (human) |
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+28S ribosomal protein ... , 27 types, 27 molecules BCDEFGHIJKLMNOPQRSTUVWXYZ01
-Protein , 3 types, 3 molecules 234
#29: Protein | Mass: 13409.661 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: cell / Source: (natural) Homo sapiens (human) / References: UniProt: Q96BP2 |
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#30: Protein | Mass: 22395.326 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: cell / Source: (natural) Homo sapiens (human) / References: UniProt: Q9NWT8 |
#31: Protein | Mass: 78648.547 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: cell / Source: (natural) Homo sapiens (human) / References: UniProt: Q96EY7 |
-Non-polymers , 7 types, 1668 molecules
#32: Chemical | ChemComp-MG / #33: Chemical | ChemComp-K / #34: Chemical | ChemComp-ZN / | #35: Chemical | #36: Chemical | ChemComp-ATP / | #37: Chemical | ChemComp-GDP / | #38: Water | ChemComp-HOH / | |
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-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Small subunit of human mitochondrial ribosome / Type: RIBOSOME / Entity ID: #1-#31 / Source: NATURAL | ||||||||||||||||||||||||||||||
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Molecular weight | Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) | Organism: Homo sapiens (human) | ||||||||||||||||||||||||||||||
Buffer solution | pH: 7.5 | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid type: Quantifoil R2/2 | ||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 297 K |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 165000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 5 sec. / Electron dose: 31 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 20583 |
EM imaging optics | Energyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV |
Image scans | Movie frames/image: 20 / Used frames/image: 1-20 |
-Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1469471 | ||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.92 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 52528 / Algorithm: BACK PROJECTION / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | Space: REAL | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | PDB-ID: 6RW4 Accession code: 6RW4 / Source name: PDB / Type: experimental model |