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- EMDB-1171: Structural roles for human translation factor eIF3 in initiation ... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-1171 | |||||||||
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Title | Structural roles for human translation factor eIF3 in initiation of protein synthesis. | |||||||||
![]() | Cryo-EM density of human translation initiation factor eIF3 bound to a conformation of HCV-IRES | |||||||||
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Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / negative staining / Resolution: 40.0 Å | |||||||||
![]() | Siridechadilok B / Fraser CS / Hall RJ / Doudna JA / Nogales E | |||||||||
![]() | ![]() Title: Structural roles for human translation factor eIF3 in initiation of protein synthesis. Authors: Bunpote Siridechadilok / Christopher S Fraser / Richard J Hall / Jennifer A Doudna / Eva Nogales / ![]() Abstract: Protein synthesis in mammalian cells requires initiation factor eIF3, a approximately 750-kilodalton complex that controls assembly of 40S ribosomal subunits on messenger RNAs (mRNAs) bearing either ...Protein synthesis in mammalian cells requires initiation factor eIF3, a approximately 750-kilodalton complex that controls assembly of 40S ribosomal subunits on messenger RNAs (mRNAs) bearing either a 5'-cap or an internal ribosome entry site (IRES). Cryo-electron microscopy reconstructions show that eIF3, a five-lobed particle, interacts with the hepatitis C virus (HCV) IRES RNA and the 5'-cap binding complex eIF4F via the same domain. Detailed modeling of eIF3 and eIF4F onto the 40S ribosomal subunit reveals that eIF3 uses eIF4F or the HCV IRES in structurally similar ways to position the mRNA strand near the exit site of 40S, promoting initiation complex assembly. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 9.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 8.7 KB 8.7 KB | Display Display | ![]() |
Images | ![]() | 8.9 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 203.5 KB | Display | ![]() |
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Full document | ![]() | 202.6 KB | Display | |
Data in XML | ![]() | 5.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related 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
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Cryo-EM density of human translation initiation factor eIF3 bound to a conformation of HCV-IRES | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 5.08 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 : Human eIF3 bound to HCV-IRES
Entire | Name: Human eIF3 bound to HCV-IRES |
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Components |
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-Supramolecule #1000: Human eIF3 bound to HCV-IRES
Supramolecule | Name: Human eIF3 bound to HCV-IRES / type: sample / ID: 1000 / Number unique components: 2 |
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Molecular weight | Theoretical: 850 KDa |
-Macromolecule #1: eIF3
Macromolecule | Name: eIF3 / type: protein_or_peptide / ID: 1 / Recombinant expression: Yes |
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Source (natural) | Organism: ![]() |
Molecular weight | Experimental: 750 KDa |
Recombinant expression | Organism: HeLa |
-Macromolecule #2: Hepatitis-C-virus internal ribosomal entry site
Macromolecule | Name: Hepatitis-C-virus internal ribosomal entry site / type: rna / ID: 2 / Name.synonym: HCV-IRES / Classification: OTHER / Structure: OTHER / Synthetic?: No |
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Molecular weight | Experimental: 100 KDa |
-Experimental details
-Structure determination
Method | negative staining, cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.08 mg/mL |
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Buffer | pH: 7.5 Details: 20mM Tris pH7.5, 100mM KCl, 3mM MgCl2, 1mM DTT,0.1mM CHAPS, 2% Trehalose |
Staining | Type: NEGATIVE / Details: cryo |
Grid | Details: holey-carbon with thin layer of carbon |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 22 K / Instrument: OTHER / Details: Vitrification instrument: Vitrobot |
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Electron microscopy
Microscope | FEI/PHILIPS CM200FEG |
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Image recording | Category: FILM / Film or detector model: KODAK SO-163 FILM / Digitization - Scanner: OTHER / Average electron dose: 20 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 50000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.2 mm / Nominal magnification: 50000 |
Sample stage | Specimen holder: eucentric / Specimen holder model: GATAN LIQUID NITROGEN |
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Image processing
CTF correction | Details: Phase flip |
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Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 40.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: SPIDER, IMAGIC / Details: This reconstruction is the refined model. |