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Open data
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Basic information
Entry | Database: PDB / ID: 3iy8 | ||||||
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Title | Leishmania tarentolae Mitonchondrial Ribosome small subunit | ||||||
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![]() | RIBOSOME / Leishmania tarentolae / Mitochondrial ribosome / CryoEM / Minimal RNA. / Antibiotic resistance / Ribonucleoprotein / Ribosomal protein / RNA-binding / rRNA-binding / Repressor / Translation regulation / tRNA-binding / Methylation / Endonuclease / Hydrolase / Nuclease | ||||||
Function / homology | ![]() misfolded RNA binding / Group I intron splicing / RNA folding / four-way junction DNA binding / regulation of mRNA stability / positive regulation of RNA splicing / DNA endonuclease activity / maintenance of translational fidelity / mRNA 5'-UTR binding / regulation of translation ...misfolded RNA binding / Group I intron splicing / RNA folding / four-way junction DNA binding / regulation of mRNA stability / positive regulation of RNA splicing / DNA endonuclease activity / maintenance of translational fidelity / mRNA 5'-UTR binding / regulation of translation / ribosomal small subunit assembly / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / cytoplasmic translation / tRNA binding / molecular adaptor activity / rRNA binding / ribosome / structural constituent of ribosome / translation / response to antibiotic / RNA binding / zinc ion binding / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 14.1 Å | ||||||
![]() | Sharma, M.R. / Booth, T.M. / Simpson, L. / Maslov, D.A. / Agrawal, R.K. | ||||||
![]() | ![]() Title: Structure of a mitochondrial ribosome with minimal RNA. Authors: Manjuli R Sharma / Timothy M Booth / Larry Simpson / Dmitri A Maslov / Rajendra K Agrawal / ![]() Abstract: The Leishmania tarentolae mitochondrial ribosome (Lmr) is a minimal ribosomal RNA (rRNA)-containing ribosome. We have obtained a cryo-EM map of the Lmr. The map reveals several features that have not ...The Leishmania tarentolae mitochondrial ribosome (Lmr) is a minimal ribosomal RNA (rRNA)-containing ribosome. We have obtained a cryo-EM map of the Lmr. The map reveals several features that have not been seen in previously-determined structures of eubacterial or eukaryotic (cytoplasmic or organellar) ribosomes to our knowledge. Comparisons of the Lmr map with X-ray crystallographic and cryo-EM maps of the eubacterial ribosomes and a cryo-EM map of the mammalian mitochondrial ribosome show that (i) the overall structure of the Lmr is considerably more porous, (ii) the topology of the intersubunit space is significantly different, with fewer intersubunit bridges, but more tunnels, and (iii) several of the functionally-important rRNA regions, including the alpha-sarcin-ricin loop, have different relative positions within the structure. Furthermore, the major portions of the mRNA channel, the tRNA passage, and the nascent polypeptide exit tunnel contain Lmr-specific proteins, suggesting that the mechanisms for mRNA recruitment, tRNA interaction, and exiting of the nascent polypeptide in Lmr must differ markedly from the mechanisms deduced for ribosomes in other organisms. Our study identifies certain structural features that are characteristic solely of mitochondrial ribosomes and other features that are characteristic of both mitochondrial and chloroplast ribosomes (i.e., organellar 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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Download
PDBx/mmCIF format | ![]() | 71.6 KB | Display | ![]() |
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PDB format | ![]() | 39.2 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 5113MC ![]() 3iy9C M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-RNA chain , 1 types, 1 molecules A
#1: RNA chain | Mass: 172221.844 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-30S ribosomal protein ... , 10 types, 10 molecules EFHIKLOPQR
#2: Protein | Mass: 15804.282 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#3: Protein | Mass: 11669.371 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#4: Protein | Mass: 14015.361 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#5: Protein | Mass: 14554.882 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#6: Protein | Mass: 12487.200 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#7: Protein | Mass: 13636.961 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#8: Protein | Mass: 10188.687 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#9: Protein | Mass: 9207.572 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#10: Protein | Mass: 9263.946 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#11: Protein | Mass: 6466.477 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-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: Leishmania Mitochondrial 50S Ribosome / Type: RIBOSOME / Details: Monomer |
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Molecular weight | Value: 2.1 MDa / Experimental value: YES |
Buffer solution | pH: 7.5 Details: 50 mM Tris-HCl, pH 7.5, 100 mM KCl, 10 mM MgCl2, 3 mM DTT, 0.1 mM EDTA and 0.05% dodecyl maltoside |
Specimen | Conc.: 0.067 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES Details: 50 mM Tris-HCl, pH 7.5, 100 mM KCl, 10 mM MgCl2, 3 mM DTT, 0.1 mM EDTA and 0.05% dodecyl maltoside |
Vitrification | Instrument: FEI VITROBOT MARK I / Cryogen name: ETHANE / Humidity: 90 % / Method: Plunge freeze |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Tecnai F20 / Image courtesy: FEI Company |
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Microscopy | Model: FEI TECNAI F20 |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 50000 X / Calibrated magnification: 50760 X / Nominal defocus max: 4500 nm / Nominal defocus min: 1600 nm / Camera length: 0 mm |
Specimen holder | Specimen holder model: OTHER / Specimen holder type: eucentric / Temperature: 80 K / Tilt angle max: 0 ° / Tilt angle min: 0 ° |
Image recording | Film or detector model: KODAK SO-163 FILM |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Relative weight: 1 |
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Processing
EM software | Name: SPIDER / Category: 3D reconstruction | ||||||||||||
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CTF correction | Details: Each Micrograph | ||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||
3D reconstruction | Method: Projection Matching / Resolution: 14.1 Å / Resolution method: FSC 0.5 CUT-OFF / Num. of particles: 53475 / Symmetry type: POINT | ||||||||||||
Atomic model building | Space: REAL | ||||||||||||
Refinement step | Cycle: LAST
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