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- EMDB-3038: Cryo-EM structure of a mammalian ribosomal termination complex wi... -
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Basic information
Entry | Database: EMDB / ID: EMD-3038 | |||||||||
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Title | Cryo-EM structure of a mammalian ribosomal termination complex with ABCE1, eRF1(AAQ) and the UAA stop codon | |||||||||
![]() | Reconstruction of a mammalian 80S ribosome-nascent chain complex containing the UAA stop codon bound to eRF1(AAQ) and ABCE1 | |||||||||
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![]() | ribosome / translation termination / release factor / stop codon / decoding | |||||||||
Function / homology | ![]() negative regulation of endoribonuclease activity / CTPase activity / translation termination factor activity / translation release factor complex / cytoplasmic translational termination / translation release factor activity / regulation of translational termination / OAS antiviral response / translation release factor activity, codon specific / protein methylation ...negative regulation of endoribonuclease activity / CTPase activity / translation termination factor activity / translation release factor complex / cytoplasmic translational termination / translation release factor activity / regulation of translational termination / OAS antiviral response / translation release factor activity, codon specific / protein methylation / ribosomal subunit / ribosome disassembly / sequence-specific mRNA binding / aminoacyl-tRNA hydrolase activity / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / regulation of G1 to G0 transition / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / regulation of translation involved in cellular response to UV / protein-DNA complex disassembly / : / mammalian oogenesis stage / G1 to G0 transition / activation-induced cell death of T cells / Protein hydroxylation / negative regulation of ubiquitin protein ligase activity / positive regulation of signal transduction by p53 class mediator / ubiquitin ligase inhibitor activity / Eukaryotic Translation Termination / phagocytic cup / ribosomal small subunit binding / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / TOR signaling / T cell proliferation involved in immune response / endoribonuclease inhibitor activity / 90S preribosome / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / cellular response to actinomycin D / negative regulation of ubiquitin-dependent protein catabolic process / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / ribosomal subunit export from nucleus / ribosomal small subunit export from nucleus / translational termination / translation regulator activity / rough endoplasmic reticulum / erythrocyte development / MDM2/MDM4 family protein binding / cytosolic ribosome / gastrulation / endonucleolytic cleavage in ITS1 to separate SSU-rRNA from 5.8S rRNA and LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / : / maturation of LSU-rRNA / class I DNA-(apurinic or apyrimidinic site) endonuclease activity / DNA-(apurinic or apyrimidinic site) lyase / ribonucleoside triphosphate phosphatase activity / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / rescue of stalled ribosome / ribosomal large subunit biogenesis / cellular response to leukemia inhibitory factor / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / positive regulation of translation / small-subunit processome / translational initiation / positive regulation of apoptotic signaling pathway / protein kinase C binding / positive regulation of protein-containing complex assembly / placenta development / cellular response to gamma radiation / transcription coactivator binding / mRNA 5'-UTR binding / spindle / Regulation of expression of SLITs and ROBOs / modification-dependent protein catabolic process / cytoplasmic ribonucleoprotein granule / G1/S transition of mitotic cell cycle / protein tag activity / rRNA processing / Interferon alpha/beta signaling / positive regulation of canonical Wnt signaling pathway / rhythmic process / ribosome biogenesis / regulation of translation / glucose homeostasis / ribosome binding / ribosomal small subunit biogenesis / ribosomal small subunit assembly / positive regulation of NF-kappaB transcription factor activity / small ribosomal subunit / 4 iron, 4 sulfur cluster binding / T cell differentiation in thymus / small ribosomal subunit rRNA binding / cell body / 5S rRNA binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / perikaryon / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / cytosolic large ribosomal subunit / cytoplasmic translation Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.65 Å | |||||||||
![]() | Brown A / Shao S / Murray J / Hegde RS / Ramakrishnan V | |||||||||
![]() | ![]() Title: Structural basis for stop codon recognition in eukaryotes. Authors: Alan Brown / Sichen Shao / Jason Murray / Ramanujan S Hegde / V Ramakrishnan / ![]() Abstract: Termination of protein synthesis occurs when a translating ribosome encounters one of three universally conserved stop codons: UAA, UAG or UGA. Release factors recognize stop codons in the ribosomal ...Termination of protein synthesis occurs when a translating ribosome encounters one of three universally conserved stop codons: UAA, UAG or UGA. Release factors recognize stop codons in the ribosomal A-site to mediate release of the nascent chain and recycling of the ribosome. Bacteria decode stop codons using two separate release factors with differing specificities for the second and third bases. By contrast, eukaryotes rely on an evolutionarily unrelated omnipotent release factor (eRF1) to recognize all three stop codons. The molecular basis of eRF1 discrimination for stop codons over sense codons is not known. Here we present cryo-electron microscopy (cryo-EM) structures at 3.5-3.8 Å resolution of mammalian ribosomal complexes containing eRF1 interacting with each of the three stop codons in the A-site. Binding of eRF1 flips nucleotide A1825 of 18S ribosomal RNA so that it stacks on the second and third stop codon bases. This configuration pulls the fourth position base into the A-site, where it is stabilized by stacking against G626 of 18S rRNA. Thus, eRF1 exploits two rRNA nucleotides also used during transfer RNA selection to drive messenger RNA compaction. In this compacted mRNA conformation, stop codons are favoured by a hydrogen-bonding network formed between rRNA and essential eRF1 residues that constrains the identity of the bases. These results provide a molecular framework for eukaryotic stop codon recognition and have implications for future studies on the mechanisms of canonical and premature translation termination. | |||||||||
History |
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Structure visualization
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 29.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 16.8 KB 16.8 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14.6 KB | Display | ![]() |
Images | ![]() | 324.4 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 370.2 KB | Display | ![]() |
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Full document | ![]() | 369.8 KB | Display | |
Data in XML | ![]() | 14.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 3jagMC ![]() 3039C ![]() 3040C ![]() 3jahC ![]() 3jaiC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Reconstruction of a mammalian 80S ribosome-nascent chain complex containing the UAA stop codon bound to eRF1(AAQ) and ABCE1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.34 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Affinity-purified 80S ribosome-nascent chain complex containing t...
Entire | Name: Affinity-purified 80S ribosome-nascent chain complex containing the UAA stop codon bound to eRF1(AAQ) and ABCE1 |
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Components |
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-Supramolecule #1000: Affinity-purified 80S ribosome-nascent chain complex containing t...
Supramolecule | Name: Affinity-purified 80S ribosome-nascent chain complex containing the UAA stop codon bound to eRF1(AAQ) and ABCE1 type: sample / ID: 1000 / Number unique components: 6 |
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Molecular weight | Theoretical: 2.1 MDa |
-Supramolecule #1: 80S ribosome
Supramolecule | Name: 80S ribosome / type: complex / ID: 1 / Recombinant expression: No / Ribosome-details: ribosome-eukaryote: ALL |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 2 MDa |
-Macromolecule #1: eukaryotic release factor 1, G183A, G184A
Macromolecule | Name: eukaryotic release factor 1, G183A, G184A / type: protein_or_peptide / ID: 1 / Name.synonym: eRF1(AAQ) / Number of copies: 1 / Recombinant expression: Yes |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | UniProtKB: Eukaryotic peptide chain release factor subunit 1 |
-Macromolecule #2: ATP binding cassette E1
Macromolecule | Name: ATP binding cassette E1 / type: protein_or_peptide / ID: 2 / Name.synonym: ABCE1, Rli1 / Recombinant expression: No |
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Source (natural) | Organism: ![]() ![]() |
Sequence | UniProtKB: ATP-binding cassette sub-family E member 1 |
-Macromolecule #4: Sec61-beta
Macromolecule | Name: Sec61-beta / type: protein_or_peptide / ID: 4 / Details: in vitro translated peptide sequence / Number of copies: 1 / Recombinant expression: No |
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Source (natural) | Organism: ![]() |
-Macromolecule #3: messenger RNA
Macromolecule | Name: messenger RNA / type: rna / ID: 3 / Name.synonym: mRNA Details: in vitro transcribed mRNA sequence containing UAA stop codon Classification: OTHER / Structure: SINGLE STRANDED / Synthetic?: No |
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Source (natural) | Organism: ![]() |
Sequence | String: UCAAAGUUUA AG |
-Macromolecule #5: transfer RNA
Macromolecule | Name: transfer RNA / type: rna / ID: 5 / Name.synonym: tRNA / Classification: OTHER / Structure: OTHER / Synthetic?: No |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 20 KDa |
-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: 7.4 / Details: 50 mM Hepes, 100 mM KAc, 5 mM MgAc2, 1 mM DTT |
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Grid | Details: R2/2 400 mesh Cu grids with thin continuous carbon support, glow discharged |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK III / Method: 30 sec wait time, blot for 3 sec before plunging |
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Electron microscopy #1
Microscopy ID | 1 |
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Microscope | FEI TITAN KRIOS |
Specialist optics | Energy filter - Name: FEI |
Details | Automated data acquisition using EPU (FEI) |
Date | Jan 23, 2015 |
Image recording | Category: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Number real images: 2672 / Average electron dose: 30 e/Å2 Details: Every image is the average of 17 frames recorded by the direct electron detector |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 104478 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.6 µm / Nominal defocus min: 2.0 µm / Nominal magnification: 59000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Electron microscopy #2
Microscopy ID | 2 |
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Microscope | FEI TITAN KRIOS |
Specialist optics | Energy filter - Name: FEI |
Details | Automated data acquisition using EPU (FEI) |
Date | Feb 16, 2015 |
Image recording | Category: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Number real images: 2672 / Average electron dose: 30 e/Å2 Details: Every image is the average of 17 frames recorded by the direct electron detector |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 104478 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.6 µm / Nominal defocus min: 2.0 µm / Nominal magnification: 59000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model | PDB ID: |
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Software | Name: Chimera, Coot |
Refinement | Space: RECIPROCAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-3jag: |
-Atomic model buiding 2
Initial model | PDB ID: |
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Software | Name: Chimera, Coot |
Refinement | Space: RECIPROCAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-3jag: |
-Atomic model buiding 3
Initial model | PDB ID: |
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Software | Name: Chimera, Coot |
Refinement | Space: RECIPROCAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-3jag: |
-Atomic model buiding 4
Initial model | PDB ID: |
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Software | Name: Chimera, Coot |
Details | Sequence was modified in Coot to agree with rabbit sequence |
Refinement | Space: RECIPROCAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-3jag: |
-Atomic model buiding 5
Initial model | PDB ID: |
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Software | Name: Chimera, Coot |
Details | Sequence was modified in Coot to agree with the most prevalent tRNA sequence for each particular codon |
Refinement | Space: RECIPROCAL / Protocol: FLEXIBLE FIT |
Output model | ![]() PDB-3jag: |