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Open data
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Basic information
| Entry | Database: PDB / ID: 5flx | ||||||
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| Title | Mammalian 40S HCV-IRES complex | ||||||
Components |
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Keywords | RIBOSOME / TRANSLATION INITIATION / HEPATITIS C VIRUS INTERNAL RIBOSOME ENTRY SITE | ||||||
| Function / homology | Function and homology informationnegative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / positive regulation of respiratory burst involved in inflammatory response / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of gastrulation / protein tyrosine kinase inhibitor activity / positive regulation of endodeoxyribonuclease activity / IRE1-RACK1-PP2A complex ...negative regulation of endoplasmic reticulum unfolded protein response / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / positive regulation of respiratory burst involved in inflammatory response / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of gastrulation / protein tyrosine kinase inhibitor activity / positive regulation of endodeoxyribonuclease activity / IRE1-RACK1-PP2A complex / nucleolus organization / positive regulation of Golgi to plasma membrane protein transport / TNFR1-mediated ceramide production / negative regulation of DNA repair / negative regulation of RNA splicing / supercoiled DNA binding / neural crest cell differentiation / NF-kappaB complex / cysteine-type endopeptidase activator activity involved in apoptotic process / oxidized purine DNA binding / positive regulation of ubiquitin-protein transferase activity / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / regulation of establishment of cell polarity / negative regulation of bicellular tight junction assembly / ubiquitin-like protein conjugating enzyme binding / negative regulation of phagocytosis / rRNA modification in the nucleus and cytosol / erythrocyte homeostasis / Formation of the ternary complex, and subsequently, the 43S complex / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / negative regulation of ubiquitin protein ligase activity / protein kinase A binding / ion channel inhibitor activity / Ribosomal scanning and start codon recognition / pigmentation / Translation initiation complex formation / positive regulation of mitochondrial depolarization / positive regulation of T cell receptor signaling pathway / fibroblast growth factor binding / negative regulation of Wnt signaling pathway / monocyte chemotaxis / positive regulation of activated T cell proliferation / negative regulation of translational frameshifting / TOR signaling / Protein hydroxylation / BH3 domain binding / SARS-CoV-1 modulates host translation machinery / iron-sulfur cluster binding / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / regulation of cell division / cellular response to ethanol / mTORC1-mediated signalling / Peptide chain elongation / Selenocysteine synthesis / Formation of a pool of free 40S subunits / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / Eukaryotic Translation Termination / ubiquitin ligase inhibitor activity / positive regulation of GTPase activity / SRP-dependent cotranslational protein targeting to membrane / Response of EIF2AK4 (GCN2) to amino acid deficiency / protein serine/threonine kinase inhibitor activity / negative regulation of ubiquitin-dependent protein catabolic process / positive regulation of signal transduction by p53 class mediator / Viral mRNA Translation / negative regulation of respiratory burst involved in inflammatory response / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / GTP hydrolysis and joining of the 60S ribosomal subunit / L13a-mediated translational silencing of Ceruloplasmin expression / Major pathway of rRNA processing in the nucleolus and cytosol / phagocytic cup / regulation of translational fidelity / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / negative regulation of protein binding / Protein methylation / positive regulation of intrinsic apoptotic signaling pathway / Nuclear events stimulated by ALK signaling in cancer / spindle assembly / laminin binding / rough endoplasmic reticulum / 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 regulator activity / ribosomal small subunit export from nucleus / positive regulation of cell cycle / gastrulation / translation initiation factor binding / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / DNA-(apurinic or apyrimidinic site) endonuclease activity / Maturation of protein E / Maturation of protein E / MDM2/MDM4 family protein binding / signaling adaptor activity / positive regulation of microtubule polymerization / ER Quality Control Compartment (ERQC) / Myoclonic epilepsy of Lafora / FLT3 signaling by CBL mutants / IRAK2 mediated activation of TAK1 complex / Prevention of phagosomal-lysosomal fusion Similarity search - Function | ||||||
| Biological species | HEPATITIS C VIRUS![]() | ||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å | ||||||
Authors | Yamamoto, H. / Collier, M. / Loerke, J. / Ismer, J. / Schmidt, A. / Hilal, T. / Sprink, T. / Yamamoto, K. / Mielke, T. / Burger, J. ...Yamamoto, H. / Collier, M. / Loerke, J. / Ismer, J. / Schmidt, A. / Hilal, T. / Sprink, T. / Yamamoto, K. / Mielke, T. / Burger, J. / Shaikh, T.R. / Dabrowski, M. / Hildebrand, P.W. / Scheerer, P. / Spahn, C.M.T. | ||||||
Citation | Journal: EMBO J / Year: 2015Title: Molecular architecture of the ribosome-bound Hepatitis C Virus internal ribosomal entry site RNA. Authors: Hiroshi Yamamoto / Marianne Collier / Justus Loerke / Jochen Ismer / Andrea Schmidt / Tarek Hilal / Thiemo Sprink / Kaori Yamamoto / Thorsten Mielke / Jörg Bürger / Tanvir R Shaikh / ...Authors: Hiroshi Yamamoto / Marianne Collier / Justus Loerke / Jochen Ismer / Andrea Schmidt / Tarek Hilal / Thiemo Sprink / Kaori Yamamoto / Thorsten Mielke / Jörg Bürger / Tanvir R Shaikh / Marylena Dabrowski / Peter W Hildebrand / Patrick Scheerer / Christian M T Spahn / ![]() Abstract: Internal ribosomal entry sites (IRESs) are structured cis-acting RNAs that drive an alternative, cap-independent translation initiation pathway. They are used by many viruses to hijack the ...Internal ribosomal entry sites (IRESs) are structured cis-acting RNAs that drive an alternative, cap-independent translation initiation pathway. They are used by many viruses to hijack the translational machinery of the host cell. IRESs facilitate translation initiation by recruiting and actively manipulating the eukaryotic ribosome using only a subset of canonical initiation factor and IRES transacting factors. Here we present cryo-EM reconstructions of the ribosome 80S- and 40S-bound Hepatitis C Virus (HCV) IRES. The presence of four subpopulations for the 80S•HCV IRES complex reveals dynamic conformational modes of the complex. At a global resolution of 3.9 Å for the most stable complex, a derived atomic model reveals a complex fold of the IRES RNA and molecular details of its interaction with the ribosome. The comparison of obtained structures explains how a modular architecture facilitates mRNA loading and tRNA binding to the P-site. This information provides the structural foundation for understanding the mechanism of HCV IRES RNA-driven translation initiation. | ||||||
| History |
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| Remark 700 | SHEET DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "LA" IN EACH CHAIN ON SHEET RECORDS BELOW ... SHEET DETERMINATION METHOD: DSSP THE SHEETS PRESENTED AS "LA" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 5-STRANDED BARREL THIS IS REPRESENTED BY A 6-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL. THE SHEETS PRESENTED AS "XA" IN EACH CHAIN ON SHEET RECORDS BELOW IS ACTUALLY AN 5-STRANDED BARREL THIS IS REPRESENTED BY A 6-STRANDED SHEET IN WHICH THE FIRST AND LAST STRANDS ARE IDENTICAL. |
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Structure visualization
| Movie |
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| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 5flx.cif.gz | 1.7 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb5flx.ent.gz | 1.3 MB | Display | PDB format |
| PDBx/mmJSON format | 5flx.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Summary document | 5flx_validation.pdf.gz | 1.2 MB | Display | wwPDB validaton report |
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| Full document | 5flx_full_validation.pdf.gz | 1.2 MB | Display | |
| Data in XML | 5flx_validation.xml.gz | 142.8 KB | Display | |
| Data in CIF | 5flx_validation.cif.gz | 238.7 KB | Display | |
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/fl/5flx ftp://data.pdbj.org/pub/pdb/validation_reports/fl/5flx | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 3221MC ![]() 3223C ![]() 3224C ![]() 3225C ![]() 3226C 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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| 1 |
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Components
-RNA chain , 2 types, 2 molecules 1z
| #1: RNA chain | Mass: 602776.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #35: RNA chain | Mass: 162190.062 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) HEPATITIS C VIRUS / Production host: ![]() |
+40S RIBOSOMAL PROTEIN ... , 31 types, 31 molecules ABCDEFGHIJKLMNOPQRSTUVWXYZabcde
-Protein , 2 types, 2 molecules fg
| #33: Protein | Mass: 18004.041 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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| #34: Protein | Mass: 35115.652 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Non-polymers , 2 types, 76 molecules 


| #36: Chemical | ChemComp-MG / #37: Chemical | |
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-Details
| Has protein modification | Y |
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-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: MAMMALIAN 80S HCV-IRES COMPLEX, CLASSICAL / Type: RIBOSOME |
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| Buffer solution | Name: 20MM TRIS-HCL, 7.5MM MGCL2, 100MM KCL, 0.2MM SPERMIDINE, 2MM DTT pH: 7.6 Details: 20MM TRIS-HCL, 7.5MM MGCL2, 100MM KCL, 0.2MM SPERMIDINE, 2MM DTT |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
| Specimen support | Details: HOLEY CARBON |
| Vitrification | Instrument: FEI VITROBOT MARK I / Cryogen name: ETHANE Details: VITRIFICATION 1 -- CRYOGEN- ETHANE, HUMIDITY- 100, TEMPERATURE- 93, INSTRUMENT- FEI VITROBOT MARK I, METHOD- BLOT FOR 2-4 SECONDS BEFORE PLUNGING, |
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Electron microscopy imaging
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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| Microscopy | Model: FEI TITAN KRIOS / Date: Oct 16, 2014 |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 75000 X / Calibrated magnification: 130293 X / Nominal defocus max: 4500 nm / Nominal defocus min: 2000 nm / Cs: 2.7 mm |
| Image recording | Electron dose: 20 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) |
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Processing
| EM software |
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| CTF correction | Details: CTFFIND3 | ||||||||||||
| Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||
| 3D reconstruction | Resolution: 3.9 Å / Num. of particles: 171820 / Nominal pixel size: 1.07 Å / Actual pixel size: 1.07 Å Details: SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-3221. (DEPOSITION ID: 13955). Symmetry type: POINT | ||||||||||||
| Atomic model building | Space: REAL | ||||||||||||
| Refinement | Highest resolution: 3.9 Å | ||||||||||||
| Refinement step | Cycle: LAST / Highest resolution: 3.9 Å
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HEPATITIS C VIRUS

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