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- PDB-4v1a: Structure of the large subunit of the mammalian mitoribosome, par... -
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Basic information
Entry | Database: PDB / ID: 4v1a | ||||||
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Title | Structure of the large subunit of the mammalian mitoribosome, part 2 of 2 | ||||||
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![]() | RIBOSOME / TRANSLATION / LARGE RIBOSOMAL SUBUNIT / MITORIBOSOME / MAMMALIAN MITOCHONDRIAL RIBOSOME / CRYO-EM | ||||||
Function / homology | ![]() Mitochondrial translation elongation / Mitochondrial translation termination / rRNA import into mitochondrion / mitochondrial translational elongation / mitochondrial translational termination / ribonuclease III activity / microprocessor complex / translation release factor activity, codon nonspecific / mitochondrial large ribosomal subunit / peptidyl-tRNA hydrolase ...Mitochondrial translation elongation / Mitochondrial translation termination / rRNA import into mitochondrion / mitochondrial translational elongation / mitochondrial translational termination / ribonuclease III activity / microprocessor complex / translation release factor activity, codon nonspecific / mitochondrial large ribosomal subunit / peptidyl-tRNA hydrolase / aminoacyl-tRNA hydrolase activity / mitochondrial ribosome / mitochondrial translation / RNA processing / double-stranded RNA binding / cell junction / 5S rRNA binding / nuclear body / ribosome / structural constituent of ribosome / ribonucleoprotein complex / translation / nucleotide binding / mitochondrion / nucleoplasm / nucleus / plasma membrane / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | ||||||
![]() | Greber, B.J. / Boehringer, D. / Leibundgut, M. / Bieri, P. / Leitner, A. / Schmitz, N. / Aebersold, R. / Ban, N. | ||||||
![]() | ![]() Title: The complete structure of the large subunit of the mammalian mitochondrial ribosome. Authors: Basil J Greber / Daniel Boehringer / Marc Leibundgut / Philipp Bieri / Alexander Leitner / Nikolaus Schmitz / Ruedi Aebersold / Nenad Ban / ![]() Abstract: Mitochondrial ribosomes (mitoribosomes) are extensively modified ribosomes of bacterial descent specialized for the synthesis and insertion of membrane proteins that are critical for energy ...Mitochondrial ribosomes (mitoribosomes) are extensively modified ribosomes of bacterial descent specialized for the synthesis and insertion of membrane proteins that are critical for energy conversion and ATP production inside mitochondria. Mammalian mitoribosomes, which comprise 39S and 28S subunits, have diverged markedly from the bacterial ribosomes from which they are derived, rendering them unique compared to bacterial, eukaryotic cytosolic and fungal mitochondrial ribosomes. We have previously determined at 4.9 Å resolution the architecture of the porcine (Sus scrofa) 39S subunit, which is highly homologous to the human mitoribosomal large subunit. Here we present the complete atomic structure of the porcine 39S large mitoribosomal subunit determined in the context of a stalled translating mitoribosome at 3.4 Å resolution by cryo-electron microscopy and chemical crosslinking/mass spectrometry. The structure reveals the locations and the detailed folds of 50 mitoribosomal proteins, shows the highly conserved mitoribosomal peptidyl transferase active site in complex with its substrate transfer RNAs, and defines the path of the nascent chain in mammalian mitoribosomes along their idiosyncratic exit tunnel. Furthermore, we present evidence that a mitochondrial tRNA has become an integral component of the central protuberance of the 39S subunit where it architecturally substitutes for the absence of the 5S ribosomal RNA, a ubiquitous component of all cytoplasmic ribosomes. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 811.5 KB | Display | ![]() |
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PDB format | ![]() | 652.4 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 2787MC ![]() 4v19C C: citing same article ( M: map data used to model this data |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
+MITORIBOSOMAL PROTEIN ... , 22 types, 22 molecules abcdefghijklmnopqtuvwx
-Protein/peptide / Non-polymers , 2 types, 2 molecules z![](data/chem/img/ZN.gif)
![](data/chem/img/ZN.gif)
#23: Protein/peptide | Mass: 4017.944 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#24: Chemical | ChemComp-ZN / |
-Details
Nonpolymer details | UNKNOWN (UNK): UNASSIGNED AMINO ACIDS BUILT AS UNK ZINC ION (ZN): ZN IONS COORDINATED BY ZINC ...UNKNOWN (UNK): UNASSIGNED |
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Sequence details | UNASSIGNED SECONDARY STRUCTURE ELEMENTS BUILT AS UNK RESIDUES OF v144-155 BUILT AS UNASSIGNED UNK ...UNASSIGNED |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: SUS SCROFA 55S MITOCHONDRIAL RIBOSOME / Type: RIBOSOME Details: QUANTIFOIL HOLEY CARBON GRIDS WERE COATED WITH A THIN CARBON FILM |
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Buffer solution | Name: 20 MM HEPES-KOH, 50 MM KCL, 40 MM MGCL2, 1 MM DTT / pH: 7.4 / Details: 20 MM HEPES-KOH, 50 MM KCL, 40 MM MGCL2, 1 MM DTT |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: CARBON |
Vitrification | Instrument: HOMEMADE PLUNGER / Cryogen name: ETHANE-PROPANE / Details: MIXTURE OF LIQUID ETHANE AND PROPANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS / Date: May 30, 2014 Details: IMAGES WERE ACQUIRED IN 2 SESSIONS ON A FEI TITAN KRIOS IN MAY 2014 |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 59000 X / Calibrated magnification: 100000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm |
Specimen holder | Temperature: 85 K |
Image recording | Electron dose: 20 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) |
Radiation wavelength | Relative weight: 1 |
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Processing
EM software |
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CTF correction | Details: PER DETECTOR FRAME | ||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||
3D reconstruction | Method: MAXIMUM LIKELIHOOD BASED REFINEMENT IMPLEMENTED IN RELION Resolution: 3.4 Å / Num. of particles: 141675 / Actual pixel size: 1.4 Å Details: FOR VISUALIZATION PURPOSES THE FINAL MAP WAS FILTERED AND AMPLITUDE CORRECTED IN RELION SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2787. (DEPOSITION ID: 12830). THE COMBINED ...Details: FOR VISUALIZATION PURPOSES THE FINAL MAP WAS FILTERED AND AMPLITUDE CORRECTED IN RELION SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2787. (DEPOSITION ID: 12830). THE COMBINED COORDINATES (SPLIT ENTRIES 4V19 AND 4V1A) WERE REFINED IN RECIPROCAL SPACE USING PHENIX.REFINE AGAINST THE MLHL TARGET. FOR THIS, THE CRYO-EM MAPS (EMD-2787) WERE CONVERTED TO RECIPROCAL SPACE STRUCTURE FACTORS. Symmetry type: POINT | ||||||||||||||||||||||||||||
Atomic model building | Space: REAL | ||||||||||||||||||||||||||||
Refinement | Highest resolution: 3.4 Å | ||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Highest resolution: 3.4 Å
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