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- PDB-7syp: Structure of the wt IRES and 40S ribosome binary complex, open co... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7syp | |||||||||||||||
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Title | Structure of the wt IRES and 40S ribosome binary complex, open conformation. Structure 10(wt) | |||||||||||||||
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![]() | RIBOSOME / HCV / IRES / 40S | |||||||||||||||
Function / homology | ![]() ribosomal subunit / laminin receptor activity / positive regulation of signal transduction by p53 class mediator / ubiquitin ligase inhibitor activity / phagocytic cup / 90S preribosome / ribosomal small subunit export from nucleus / translation regulator activity / rough endoplasmic reticulum / laminin binding ...ribosomal subunit / laminin receptor activity / positive regulation of signal transduction by p53 class mediator / ubiquitin ligase inhibitor activity / phagocytic cup / 90S preribosome / ribosomal small subunit export from nucleus / translation regulator activity / rough endoplasmic reticulum / laminin binding / gastrulation / MDM2/MDM4 family protein binding / cytosolic ribosome / class I DNA-(apurinic or apyrimidinic site) endonuclease activity / DNA-(apurinic or apyrimidinic site) lyase / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / maturation of SSU-rRNA / small-subunit processome / positive regulation of apoptotic signaling pathway / spindle / mRNA 5'-UTR binding / rRNA processing / positive regulation of canonical Wnt signaling pathway / rhythmic process / regulation of translation / ribosome binding / virus receptor activity / ribosomal small subunit assembly / ribosomal small subunit biogenesis / small ribosomal subunit / small ribosomal subunit rRNA binding / cytosolic small ribosomal subunit / perikaryon / cytoplasmic translation / cell differentiation / mitochondrial inner membrane / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / cell division / DNA repair / mRNA binding / centrosome / apoptotic process / dendrite / synapse / negative regulation of apoptotic process / nucleolus / perinuclear region of cytoplasm / Golgi apparatus / endoplasmic reticulum / DNA binding / RNA binding / zinc ion binding / nucleus / membrane / metal ion binding / plasma membrane / cytoplasm Similarity search - Function | |||||||||||||||
Biological species | ![]() ![]() ![]() | |||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å | |||||||||||||||
![]() | Brown, Z.P. / Abaeva, I.S. / De, S. / Hellen, C.U.T. / Pestova, T.V. / Frank, J. | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Molecular architecture of 40S translation initiation complexes on the hepatitis C virus IRES. Authors: Zuben P Brown / Irina S Abaeva / Swastik De / Christopher U T Hellen / Tatyana V Pestova / Joachim Frank / ![]() Abstract: Hepatitis C virus mRNA contains an internal ribosome entry site (IRES) that mediates end-independent translation initiation, requiring a subset of eukaryotic initiation factors (eIFs). Biochemical ...Hepatitis C virus mRNA contains an internal ribosome entry site (IRES) that mediates end-independent translation initiation, requiring a subset of eukaryotic initiation factors (eIFs). Biochemical studies revealed that direct binding of the IRES to the 40S ribosomal subunit places the initiation codon into the P site, where it base pairs with eIF2-bound Met-tRNAiMet forming a 48S initiation complex. Subsequently, eIF5 and eIF5B mediate subunit joining, yielding an elongation-competent 80S ribosome. Initiation can also proceed without eIF2, in which case Met-tRNAiMet is recruited directly by eIF5B. However, the structures of initiation complexes assembled on the HCV IRES, the transitions between different states, and the accompanying conformational changes have remained unknown. To fill these gaps, we now obtained cryo-EM structures of IRES initiation complexes, at resolutions up to 3.5 Å, that cover all major stages from the initial ribosomal association, through eIF2-containing 48S initiation complexes, to eIF5B-containing complexes immediately prior to subunit joining. These structures provide insights into the dynamic network of 40S/IRES contacts, highlight the role of IRES domain II, and reveal conformational changes that occur during the transition from eIF2- to eIF5B-containing 48S complexes and prepare them for subunit joining. | |||||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.8 MB | Display | ![]() |
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PDB format | ![]() | 1.4 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.7 MB | Display | ![]() |
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Full document | ![]() | 1.8 MB | Display | |
Data in XML | ![]() | 156.9 KB | Display | |
Data in CIF | ![]() | 260.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 25536MC ![]() 7syiC ![]() 7syjC ![]() 7sykC ![]() 7sylC ![]() 7syoC ![]() 7syqC ![]() 7syrC ![]() 7sysC ![]() 7sytC ![]() 7syuC ![]() 7syvC ![]() 7sywC ![]() 7syxC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-RNA chain , 3 types, 3 molecules 27z
#1: RNA chain | Mass: 603100.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#36: RNA chain | Mass: 3905.512 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#37: RNA chain | Mass: 128746.109 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
+Protein , 33 types, 33 molecules BCDEFGHIJKLMNOPQRSTUVWXYZabcde...
-Protein/peptide / Non-polymers , 2 types, 3 molecules n

#35: Protein/peptide | Mass: 3473.451 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#38: Chemical |
-Details
Has ligand of interest | N |
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Has protein modification | Y |
-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: 40S ribosomal small subunit with HCV IRES / Type: RIBOSOME / Entity ID: #1-#27, #29-#37 / Source: MULTIPLE SOURCES |
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Molecular weight | Value: 2 MDa / Experimental value: NO |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 7.5E-5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: H2/O2 mixture for 25 seconds at 25W power / Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R0.6/1 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277.15 K / Details: 4 second blot time, force 3 |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Tecnai F30 / Image courtesy: FEI Company |
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Microscopy | Model: FEI TECNAI F30 |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 56000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm / Cs: 2.26 mm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN |
Image recording | Average exposure time: 4 sec. / Electron dose: 70.9 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19.1_4122: / Classification: refinement | ||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 97108 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||
Atomic model building | 3D fitting-ID: 1 / Source name: PDB / Type: experimental model
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Refine LS restraints |
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