+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-3050 | |||||||||
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Title | Structure of a partial yeast 43S preinitiation complex | |||||||||
Map data | py43S | |||||||||
Sample |
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Keywords | Eukaryotic translation initiation / 48S / small ribosome subunit. | |||||||||
Function / homology | Function and homology information formation of translation initiation ternary complex / Recycling of eIF2:GDP / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 3 complex, eIF3e / ABC-family proteins mediated transport / eukaryotic translation initiation factor 3 complex, eIF3m / methionyl-initiator methionine tRNA binding / incipient cellular bud site / translation reinitiation / eukaryotic translation initiation factor 2 complex ...formation of translation initiation ternary complex / Recycling of eIF2:GDP / Cellular response to mitochondrial stress / eukaryotic translation initiation factor 3 complex, eIF3e / ABC-family proteins mediated transport / eukaryotic translation initiation factor 3 complex, eIF3m / methionyl-initiator methionine tRNA binding / incipient cellular bud site / translation reinitiation / eukaryotic translation initiation factor 2 complex / eukaryotic translation initiation factor 3 complex / formation of cytoplasmic translation initiation complex / multi-eIF complex / cytoplasmic translational initiation / protein-synthesizing GTPase / eukaryotic 43S preinitiation complex / formation of translation preinitiation complex / eukaryotic 48S preinitiation complex / positive regulation of translational fidelity / Formation of the ternary complex, and subsequently, the 43S complex / Translation initiation complex formation / Ribosomal scanning and start codon recognition / Formation of a pool of free 40S subunits / L13a-mediated translational silencing of Ceruloplasmin expression / ribosomal small subunit binding / 90S preribosome / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / regulation of translational fidelity / translation regulator activity / 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) / translation initiation factor binding / translation initiation factor activity / rescue of stalled ribosome / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / small-subunit processome / translational initiation / protein kinase C binding / positive regulation of apoptotic signaling pathway / maintenance of translational fidelity / modification-dependent protein catabolic process / cytoplasmic stress granule / protein tag activity / rRNA processing / ribosomal small subunit biogenesis / double-stranded RNA binding / small ribosomal subunit rRNA binding / ribosome binding / ribosomal small subunit assembly / small ribosomal subunit / cytosolic small ribosomal subunit / cytoplasmic translation / cytosolic large ribosomal subunit / rRNA binding / ribosome / protein ubiquitination / structural constituent of ribosome / positive regulation of protein phosphorylation / ribonucleoprotein complex / translation / GTPase activity / mRNA binding / ubiquitin protein ligase binding / GTP binding / nucleolus / protein kinase binding / RNA binding / zinc ion binding / identical protein binding / nucleus / metal ion binding / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | Kluyveromyces lactis (yeast) / Saccharomyces cerevisiae (brewer's yeast) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 14.9 Å | |||||||||
Authors | Llacer JL / Hussain T / Ramakrishnan V | |||||||||
Citation | Journal: Mol Cell / Year: 2015 Title: Conformational Differences between Open and Closed States of the Eukaryotic Translation Initiation Complex. Authors: Jose L Llácer / Tanweer Hussain / Laura Marler / Colin Echeverría Aitken / Anil Thakur / Jon R Lorsch / Alan G Hinnebusch / V Ramakrishnan / Abstract: Translation initiation in eukaryotes begins with the formation of a pre-initiation complex (PIC) containing the 40S ribosomal subunit, eIF1, eIF1A, eIF3, ternary complex (eIF2-GTP-Met-tRNAi), and ...Translation initiation in eukaryotes begins with the formation of a pre-initiation complex (PIC) containing the 40S ribosomal subunit, eIF1, eIF1A, eIF3, ternary complex (eIF2-GTP-Met-tRNAi), and eIF5. The PIC, in an open conformation, attaches to the 5' end of the mRNA and scans to locate the start codon, whereupon it closes to arrest scanning. We present single particle cryo-electron microscopy (cryo-EM) reconstructions of 48S PICs from yeast in these open and closed states, at 6.0 Å and 4.9 Å, respectively. These reconstructions show eIF2β as well as a configuration of eIF3 that appears to encircle the 40S, occupying part of the subunit interface. Comparison of the complexes reveals a large conformational change in the 40S head from an open mRNA latch conformation to a closed one that constricts the mRNA entry channel and narrows the P site to enclose tRNAi, thus elucidating key events in start codon recognition. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_3050.map.gz | 96.1 MB | EMDB map data format | |
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Header (meta data) | emd-3050-v30.xml emd-3050.xml | 15.4 KB 15.4 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_3050_fsc.xml | 10.7 KB | Display | FSC data file |
Images | EMD-3050.png emd_3050.png | 198.8 KB 198.8 KB | ||
Others | emd_3050_half_map_1.map.gz emd_3050_half_map_2.map.gz | 80.8 MB 80.8 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-3050 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-3050 | HTTPS FTP |
-Validation report
Summary document | emd_3050_validation.pdf.gz | 254.5 KB | Display | EMDB validaton report |
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Full document | emd_3050_full_validation.pdf.gz | 253.6 KB | Display | |
Data in XML | emd_3050_validation.xml.gz | 11.5 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-3050 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-3050 | HTTPS FTP |
-Related structure data
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_3050.map.gz / Format: CCP4 / Size: 100.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | py43S | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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
-Supplemental map: emd 3050 half map 1.map
File | emd_3050_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Supplemental map: emd 3050 half map 2.map
File | emd_3050_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Sample components
-Entire : Partial yeast 43S preinitiation complex
Entire | Name: Partial yeast 43S preinitiation complex |
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Components |
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-Supramolecule #1000: Partial yeast 43S preinitiation complex
Supramolecule | Name: Partial yeast 43S preinitiation complex / type: sample / ID: 1000 Oligomeric state: Hetero-oligomer of ribosome with elongation factors 1, 1A, 2 (alpha, beta and gamma subunits) and initiator tRNA Number unique components: 7 |
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Molecular weight | Theoretical: 1.35 MDa |
-Supramolecule #1: Ribosome small subunit
Supramolecule | Name: Ribosome small subunit / type: complex / ID: 1 / Name.synonym: 40S / Recombinant expression: No / Ribosome-details: ribosome-eukaryote: SSU 40S, SSU RNA 18S |
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Source (natural) | Organism: Kluyveromyces lactis (yeast) |
Molecular weight | Theoretical: 1.2 MDa |
-Macromolecule #1: Eukaryotic initiation factor 1
Macromolecule | Name: Eukaryotic initiation factor 1 / type: protein_or_peptide / ID: 1 / Name.synonym: eIF1 / Number of copies: 1 / Oligomeric state: Monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) / synonym: Baker's yeast |
Molecular weight | Theoretical: 12.3 KDa |
Recombinant expression | Organism: Escherichia coli BL21(DE3) (bacteria) / Recombinant strain: Rosetta / Recombinant plasmid: pTYB2 |
Sequence | UniProtKB: Eukaryotic translation initiation factor eIF-1 |
-Macromolecule #2: Eukaryotic initiation factor 1A
Macromolecule | Name: Eukaryotic initiation factor 1A / type: protein_or_peptide / ID: 2 / Name.synonym: eIF1A / Number of copies: 1 / Oligomeric state: Monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) / synonym: baker's yeast |
Molecular weight | Theoretical: 17.4 KDa |
Recombinant expression | Organism: Escherichia coli BL21(DE3) (bacteria) / Recombinant strain: Rosetta / Recombinant plasmid: pTYB2 |
Sequence | UniProtKB: Eukaryotic translation initiation factor 1A |
-Macromolecule #3: Eukaryotic initiation factor 2 subunit alpha
Macromolecule | Name: Eukaryotic initiation factor 2 subunit alpha / type: protein_or_peptide / ID: 3 / Name.synonym: eIF-2-alpha Details: Uniprot codes are: alpha-P20459 beta-P09064 gamma-P32481 Number of copies: 1 / Oligomeric state: monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) / synonym: Baker's yeast |
Molecular weight | Theoretical: 35 KDa |
Recombinant expression | Organism: Saccharomyces cerevisiae (brewer's yeast) / Recombinant strain: GP3511 |
-Macromolecule #4: Eukaryotic initiation factor 2 subunit beta
Macromolecule | Name: Eukaryotic initiation factor 2 subunit beta / type: protein_or_peptide / ID: 4 / Name.synonym: eIF-2-beta Details: Uniprot codes are: alpha-P20459 beta-P09064 gamma-P32481 Number of copies: 1 / Oligomeric state: monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) / synonym: Baker's yeast |
Molecular weight | Theoretical: 32 KDa |
Recombinant expression | Organism: Saccharomyces cerevisiae (brewer's yeast) / Recombinant strain: GP3511 |
Sequence | UniProtKB: Eukaryotic translation initiation factor 2 subunit beta |
-Macromolecule #5: Eukaryotic initiation factor 2 subunit gamma
Macromolecule | Name: Eukaryotic initiation factor 2 subunit gamma / type: protein_or_peptide / ID: 5 / Name.synonym: eIF-2-gamma Details: Uniprot codes are: alpha-P20459 beta-P09064 gamma-P32481 Number of copies: 1 / Oligomeric state: monomer / Recombinant expression: Yes |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) / synonym: Baker's yeast |
Molecular weight | Theoretical: 58 KDa |
Recombinant expression | Organism: Saccharomyces cerevisiae (brewer's yeast) / Recombinant strain: GP3511 |
Sequence | UniProtKB: Eukaryotic translation initiation factor 2 subunit gamma |
-Macromolecule #6: Initiator transfer RNA
Macromolecule | Name: Initiator transfer RNA / type: rna / ID: 6 / Name.synonym: Met-tRNAi / Classification: TRANSFER / Structure: SINGLE STRANDED / Synthetic?: No |
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Source (natural) | Organism: Saccharomyces cerevisiae (brewer's yeast) / synonym: Baker's yeast |
Molecular weight | Theoretical: 23 KDa |
Sequence | String: AGCGCCGUGG CGCAGUGGAA GCGCGCAGGG CUCAUAACCC UGAUGUCCUC GGAUCGAAAC CGAGCGGCGC UACCA |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Concentration | 0.17 mg/mL |
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Buffer | pH: 6.5 Details: 20mM MES-KOH, 40mM K-acetate, 10mM NH4-acetate, 8mM Mg-acetate, 2mM DTT |
Grid | Details: Quantifoil R2/2 400 mesh copper grids with 4-5 nm thin carbon on top |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 120 K / Instrument: FEI VITROBOT MARK I / Timed resolved state: 30 second incubation time / Method: Blot for 2.5-3 seconds before plunging |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Alignment procedure | Legacy - Astigmatism: Objective lens astigmatism was corrected at 59,000 times magnification |
Details | Complete dataset was collected in 2 non-consecutive sessions |
Date | Apr 28, 2014 |
Image recording | Category: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Number real images: 2056 / Average electron dose: 27 e/Å2 Details: Complete dataset was collected in 2 non-consecutive sessions |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Calibrated magnification: 104478 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 4.0 µm / Nominal defocus min: 1.5 µm / Nominal magnification: 78000 |
Sample stage | Specimen holder model: GATAN LIQUID NITROGEN |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |