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- EMDB-16898: 28S human mitochondrial small ribosomal subunit with mtRF1 and P-... -
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Open data
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Basic information
Entry | ![]() | ||||||||||||
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Title | 28S human mitochondrial small ribosomal subunit with mtRF1 and P-site tRNA | ||||||||||||
![]() | Human 28S mitoribosomal small subunit | ||||||||||||
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![]() | human mitochondrial ribosome / release factor mtRF1 / non-canonical stop codon / RIBOSOME | ||||||||||||
Function / homology | ![]() translation release factor activity / mitochondrial ribosome binding / mitochondrial ribosome assembly / mitochondrial translational termination / translation release factor activity, codon specific / Mitochondrial translation elongation / Mitochondrial translation termination / positive regulation of mitochondrial translation / Mitochondrial translation initiation / negative regulation of mitotic nuclear division ...translation release factor activity / mitochondrial ribosome binding / mitochondrial ribosome assembly / mitochondrial translational termination / translation release factor activity, codon specific / Mitochondrial translation elongation / Mitochondrial translation termination / positive regulation of mitochondrial translation / Mitochondrial translation initiation / negative regulation of mitotic nuclear division / mitochondrial large ribosomal subunit / mitochondrial small ribosomal subunit / mitochondrial ribosome / mitochondrial translation / positive regulation of proteolysis / ribosomal small subunit binding / Mitochondrial protein degradation / apoptotic signaling pathway / fibrillar center / cell junction / regulation of translation / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / nuclear membrane / cytosolic small ribosomal subunit / cell population proliferation / cytosolic large ribosomal subunit / mitochondrial inner membrane / tRNA binding / rRNA binding / ribosome / structural constituent of ribosome / mitochondrial matrix / translation / protein domain specific binding / intracellular membrane-bounded organelle / mRNA binding / synapse / nucleolus / GTP binding / mitochondrion / RNA binding / nucleoplasm / nucleus / plasma membrane / cytoplasm / cytosol Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.0 Å | ||||||||||||
![]() | Saurer M / Leibundgut M / Scaiola A / Schoenhut T / Ban N | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Molecular basis of translation termination at noncanonical stop codons in human mitochondria. Authors: Martin Saurer / Marc Leibundgut / Hima Priyanka Nadimpalli / Alain Scaiola / Tanja Schönhut / Richard G Lee / Stefan J Siira / Oliver Rackham / René Dreos / Tea Lenarčič / Eva Kummer / ...Authors: Martin Saurer / Marc Leibundgut / Hima Priyanka Nadimpalli / Alain Scaiola / Tanja Schönhut / Richard G Lee / Stefan J Siira / Oliver Rackham / René Dreos / Tea Lenarčič / Eva Kummer / David Gatfield / Aleksandra Filipovska / Nenad Ban / ![]() ![]() ![]() Abstract: The genetic code that specifies the identity of amino acids incorporated into proteins during protein synthesis is almost universally conserved. Mitochondrial genomes feature deviations from the ...The genetic code that specifies the identity of amino acids incorporated into proteins during protein synthesis is almost universally conserved. Mitochondrial genomes feature deviations from the standard genetic code, including the reassignment of two arginine codons to stop codons. The protein required for translation termination at these noncanonical stop codons to release the newly synthesized polypeptides is not currently known. In this study, we used gene editing and ribosomal profiling in combination with cryo-electron microscopy to establish that mitochondrial release factor 1 (mtRF1) detects noncanonical stop codons in human mitochondria by a previously unknown mechanism of codon recognition. We discovered that binding of mtRF1 to the decoding center of the ribosome stabilizes a highly unusual conformation in the messenger RNA in which the ribosomal RNA participates in specific recognition of the noncanonical stop codons. | ||||||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 483.5 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 63.5 KB 63.5 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 17 KB | Display | ![]() |
Images | ![]() | 195.6 KB | ||
Filedesc metadata | ![]() | 15.2 KB | ||
Others | ![]() ![]() | 475.6 MB 475.6 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 26.8 KB | Display | |
Data in CIF | ![]() | 35.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8oisMC ![]() 8oinC ![]() 8oipC ![]() 8oiqC ![]() 8oirC ![]() 8oitC C: citing same article ( M: atomic model generated by this map |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||
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Annotation | Human 28S mitoribosomal small subunit | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.06 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: half map B
File | emd_16898_half_map_1.map | ||||||||||||
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Annotation | half map B | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: half map A
File | emd_16898_half_map_2.map | ||||||||||||
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Annotation | half map A | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
+Entire : 28S human mitochondrial small ribosomal subunit with mtRF1, mRNA,...
+Supramolecule #1: 28S human mitochondrial small ribosomal subunit with mtRF1, mRNA,...
+Macromolecule #1: 39S ribosomal protein L19, mitochondrial
+Macromolecule #2: 39S ribosomal protein L55, mitochondrial
+Macromolecule #4: 28S ribosomal protein S35, mitochondrial
+Macromolecule #5: 28S ribosomal protein S24, mitochondrial
+Macromolecule #6: Aurora kinase A-interacting protein
+Macromolecule #7: 28S ribosomal protein S6, mitochondrial
+Macromolecule #8: 28S ribosomal protein S7, mitochondrial
+Macromolecule #10: 28S ribosomal protein S10, mitochondrial
+Macromolecule #12: 28S ribosomal protein S12, mitochondrial
+Macromolecule #13: 28S ribosomal protein S14, mitochondrial
+Macromolecule #14: 28S ribosomal protein S15, mitochondrial
+Macromolecule #15: 28S ribosomal protein S16, mitochondrial
+Macromolecule #16: 28S ribosomal protein S17, mitochondrial
+Macromolecule #17: 28S ribosomal protein S18b, mitochondrial
+Macromolecule #18: 28S ribosomal protein S18c, mitochondrial
+Macromolecule #19: 28S ribosomal protein S21, mitochondrial
+Macromolecule #20: 28S ribosomal protein S22, mitochondrial
+Macromolecule #21: 28S ribosomal protein S23, mitochondrial
+Macromolecule #22: 28S ribosomal protein S25, mitochondrial
+Macromolecule #23: 28S ribosomal protein S26, mitochondrial
+Macromolecule #24: 28S ribosomal protein S27, mitochondrial
+Macromolecule #25: 28S ribosomal protein S28, mitochondrial
+Macromolecule #26: 28S ribosomal protein S29, mitochondrial
+Macromolecule #27: 28S ribosomal protein S31, mitochondrial
+Macromolecule #28: 28S ribosomal protein S33, mitochondrial
+Macromolecule #29: Peptide chain release factor 1, mitochondrial,mtRF1(AAQ)
+Macromolecule #30: 28S ribosomal protein S2, mitochondrial
+Macromolecule #31: Coiled-coil-helix-coiled-coil-helix domain-containing protein 1
+Macromolecule #32: 28S ribosomal protein S5, mitochondrial
+Macromolecule #33: Pentatricopeptide repeat domain-containing protein 3, mitochondrial
+Macromolecule #34: 28S ribosomal protein S9, mitochondrial
+Macromolecule #35: 28S ribosomal protein S11, mitochondrial
+Macromolecule #36: 28S ribosomal protein S34, mitochondrial
+Macromolecule #3: 12S rRNA
+Macromolecule #9: P-site Met-tRNA(Met)
+Macromolecule #11: mRNA
+Macromolecule #37: POTASSIUM ION
+Macromolecule #38: MAGNESIUM ION
+Macromolecule #39: METHIONINE
+Macromolecule #40: ZINC ION
+Macromolecule #41: FE-S-O HYBRID CLUSTER
+Macromolecule #42: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #43: GUANOSINE-5'-DIPHOSPHATE
+Macromolecule #44: water
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R2/2 / 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 | |||||||||||||||
Vitrification | Cryogen name: ETHANE-PROPANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV | |||||||||||||||
Details | Affinity-purified 55S mitoribosome. Refinement focused on 28S small subunit. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Slit width: 20 eV |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 2 / Number real images: 43882 / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.0 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 |
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Image processing
-Atomic model buiding 1
Initial model |
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Refinement | Space: REAL / Protocol: FLEXIBLE FIT | |||||||||
Output model | ![]() PDB-8ois: |