+Open data
-Basic information
Entry | Database: PDB / ID: 7mqj | ||||||
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Title | Dhr1 Helicase Core | ||||||
Components | Probable ATP-dependent RNA helicase DHR1 | ||||||
Keywords | HYDROLASE / Helicase / Ribosome Assembly | ||||||
Function / homology | Function and homology information Major pathway of rRNA processing in the nucleolus and cytosol / 90S preribosome / maturation of SSU-rRNA / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / small-subunit processome / helicase activity / ribosome biogenesis / RNA helicase activity / RNA helicase / nucleolus ...Major pathway of rRNA processing in the nucleolus and cytosol / 90S preribosome / maturation of SSU-rRNA / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / small-subunit processome / helicase activity / ribosome biogenesis / RNA helicase activity / RNA helicase / nucleolus / ATP hydrolysis activity / mitochondrion / RNA binding / nucleoplasm / ATP binding Similarity search - Function | ||||||
Biological species | Saccharomyces cerevisiae (brewer's yeast) | ||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.23 Å | ||||||
Authors | Miller, L. / Chaker-Margot, M. / Klinge, S. | ||||||
Funding support | United States, 1items
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Citation | Journal: Science / Year: 2021 Title: Nucleolar maturation of the human small subunit processome. Authors: Sameer Singh / Arnaud Vanden Broeck / Linamarie Miller / Malik Chaker-Margot / Sebastian Klinge / Abstract: The human small subunit processome mediates early maturation of the small ribosomal subunit by coupling RNA folding to subsequent RNA cleavage and processing steps. We report the high-resolution ...The human small subunit processome mediates early maturation of the small ribosomal subunit by coupling RNA folding to subsequent RNA cleavage and processing steps. We report the high-resolution cryo–electron microscopy structures of maturing human small subunit (SSU) processomes at resolutions of 2.7 to 3.9 angstroms. These structures reveal the molecular mechanisms that enable crucial progressions during SSU processome maturation. RNA folding states within these particles are communicated to and coordinated with key enzymes that drive irreversible steps such as targeted exosome-mediated RNA degradation, protein-guided site-specific endonucleolytic RNA cleavage, and tightly controlled RNA unwinding. These conserved mechanisms highlight the SSU processome’s impressive structural plasticity, which endows this 4.5-megadalton nucleolar assembly with the distinctive ability to mature the small ribosomal subunit from within. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7mqj.cif.gz | 339.9 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7mqj.ent.gz | 272.5 KB | Display | PDB format |
PDBx/mmJSON format | 7mqj.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/mq/7mqj ftp://data.pdbj.org/pub/pdb/validation_reports/mq/7mqj | HTTPS FTP |
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-Related structure data
Related structure data | 7mq8C 7mq9C 7mqaC 2xauS S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data |
-Links
-Assembly
Deposited unit |
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1 |
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Unit cell |
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-Components
#1: Protein | Mass: 90793.164 Da / Num. of mol.: 1 / Fragment: UNP residues 379-1174 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast) Gene: ECM16, DHR1, YMR128W, YM9553.04 / Production host: Escherichia coli (E. coli) / References: UniProt: Q04217, RNA helicase |
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#2: Chemical | ChemComp-MG / |
#3: Chemical | ChemComp-ADP / |
#4: Water | ChemComp-HOH / |
Has ligand of interest | N |
-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION / Number of used crystals: 1 |
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-Sample preparation
Crystal | Density Matthews: 2.5 Å3/Da / Density % sol: 50.84 % |
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Crystal grow | Temperature: 277.15 K / Method: vapor diffusion, sitting drop / Details: PEG6000, HEPES, pH 7.0, magnesium chloride, ADP |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: SYNCHROTRON / Site: NSLS-II / Beamline: 17-ID-1 / Wavelength: 0.97919 Å |
Detector | Type: DECTRIS EIGER X 9M / Detector: PIXEL / Date: Feb 12, 2016 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.97919 Å / Relative weight: 1 |
Reflection | Resolution: 2.23→39.37 Å / Num. obs: 42918 / % possible obs: 99.34 % / Redundancy: 3.4 % / CC1/2: 0.997 / CC star: 0.999 / Rmerge(I) obs: 0.08197 / Rpim(I) all: 0.05173 / Rrim(I) all: 0.0972 / Net I/σ(I): 11.89 |
Reflection shell | Resolution: 2.23→2.31 Å / Num. unique obs: 4275 / CC1/2: 0.784 / CC star: 0.938 / % possible all: 98.68 |
-Processing
Software |
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: PDB entry 2XAU Resolution: 2.23→39.362 Å / SU ML: 0.27 / Cross valid method: THROUGHOUT / σ(F): 1.37 / Phase error: 24.89 / Stereochemistry target values: ML
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso max: 159.25 Å2 / Biso mean: 50.9221 Å2 / Biso min: 15.36 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: final / Resolution: 2.23→39.362 Å
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LS refinement shell | Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0
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Refinement TLS params. | Method: refined / Refine-ID: X-RAY DIFFRACTION
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Refinement TLS group |
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