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- EMDB-3223: Mammalian 80S HCV-IRES complex, Classical / no head tilt -

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Basic information

Entry
Database: EMDB / ID: EMD-3223
TitleMammalian 80S HCV-IRES complex, Classical / no head tilt
Map dataReconstruction of ribosome complex
Sample
  • Sample: Mammalian 80S HCV-IRES complex, Classical / no head tilt
  • Complex: 80S ribosome
  • RNA: HCV-IRES
  • RNA: tRNA
Keywordsribosome / translation initiation / Hepatitis C Virus internal ribosome entry site
Biological speciesOryctolagus cuniculus (rabbit) / Hepatitis C virus
Methodsingle particle reconstruction / cryo EM / Resolution: 5.8 Å
AuthorsYamamoto 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 TR / Dabrowski M / Hildebrand PW / Scheerer P / Spahn CMT
CitationJournal: EMBO J / Year: 2015
Title: 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
DepositionOct 28, 2015-
Header (metadata) releaseNov 25, 2015-
Map releaseDec 16, 2015-
UpdateJan 13, 2016-
Current statusJan 13, 2016Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 2
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 2
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

EMD-4-3223.png

Downloads & links

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Map

FileDownload / File: emd_3223.map.gz / Format: CCP4 / Size: 204.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationReconstruction of ribosome complex
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)X (Row.)Y (Col.)
1.07 Å/pix.
x 380 pix.
= 406.6 Å		1.07 Å/pix.
x 380 pix.
= 406.6 Å		1.07 Å/pix.
x 380 pix.
= 406.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 2.0 / Movie #1: 2
Minimum - Maximum-6.52448988 - 15.281042100000001
Average (Standard dev.)0.06618196 (±1.21659398)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderYXZ
Origin-190-190-189
Dimensions380380380
Spacing380380380
CellA=B=C: 406.6 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z380380380
origin x/y/z0.0000.0000.000
length x/y/z406.600406.600406.600
α/β/γ90.00090.00090.000
start NX/NY/NZ-190-190-189
NX/NY/NZ380380380
MAP C/R/S213
start NC/NR/NS-190-190-189
NC/NR/NS380380380
D min/max/mean-6.52415.2810.066

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Supplemental data

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Sample components

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Entire : Mammalian 80S HCV-IRES complex, Classical / no head tilt

EntireName: Mammalian 80S HCV-IRES complex, Classical / no head tilt
Components
  • Sample: Mammalian 80S HCV-IRES complex, Classical / no head tilt
  • Complex: 80S ribosome
  • RNA: HCV-IRES
  • RNA: tRNA

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Supramolecule #1000: Mammalian 80S HCV-IRES complex, Classical / no head tilt

SupramoleculeName: Mammalian 80S HCV-IRES complex, Classical / no head tilt
type: sample / ID: 1000 / Number unique components: 3
Molecular weightTheoretical: 4.6 MDa

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Supramolecule #1: 80S ribosome

SupramoleculeName: 80S ribosome / type: complex / ID: 1 / Recombinant expression: No / Ribosome-details: ribosome-eukaryote: ALL
Source (natural)Organism: Oryctolagus cuniculus (rabbit) / synonym: rabbit / Tissue: reticulocyte lysate
Molecular weightTheoretical: 4.5 MDa

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Macromolecule #1: HCV-IRES

MacromoleculeName: HCV-IRES / type: rna / ID: 1 / Classification: OTHER / Structure: DOUBLE HELIX / Synthetic?: Yes
Source (natural)Organism: Hepatitis C virus / synonym: HCV
Molecular weightTheoretical: 162 KDa
SequenceString: GCCAGCCCCC UGAUGGGGGC GACACUCCAC CAUGAAUCAC UCCCCUGUGA GGAACUACUG UCUUCACGCA GAAAGCGUCU AGCCAUGGCG UUAGUAUGAG UGUCGUGCAG CCUCCAGGAC CCCCCCUCCC GGGAGAGCCA UAGUGGUCUG CGGAACCGGU GAGUACACCG ...String:
GCCAGCCCCC UGAUGGGGGC GACACUCCAC CAUGAAUCAC UCCCCUGUGA GGAACUACUG UCUUCACGCA GAAAGCGUCU AGCCAUGGCG UUAGUAUGAG UGUCGUGCAG CCUCCAGGAC CCCCCCUCCC GGGAGAGCCA UAGUGGUCUG CGGAACCGGU GAGUACACCG GAAUUGCCAG GACGACCGGG UCCUUUCUUG GAUAAACCCG CUCAAUGCCU GGAGAUUUGG GCGUGCCCCC GCAAGACUGC UAGCCGAGUA GUGUUGGGUC GCGAAAGGCC UUGUGGUACU GCCUGAUAGG GUGCUUGCGA GUGCCCCGGG AGGUCUCGUA GACCGUGCAC CAUGAGCACG AAUCCUAAAC CUCAAAGAAA AACCAAACGU AACACCAACC GUCGCCCACA GGACGUCAAG UUCCCGGGUG GCGGUCUAGA CGCCGAGAUC AGAAAUCCCU CUCUCGGAUC GCAUUUGGAC UUCUGCCUUC GGGCACCACG GUCGGAUCCG AAUU

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Macromolecule #2: tRNA

MacromoleculeName: tRNA / type: rna / ID: 2 / Details: Rabbit reticulocyte / Classification: OTHER / Structure: DOUBLE HELIX / Synthetic?: No
Source (natural)Organism: Oryctolagus cuniculus (rabbit) / synonym: rabbit
Molecular weightTheoretical: 2.5 KDa

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.6
Details: 20mM Tris-HCl, 7.5mM MgCl2, 100mM KCl, 0.2mM spermidine, 2mM DTT
GridDetails: Quantifoil R3-3 Cu 300 mesh with 2 nm carbon support film
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 93 K / Instrument: FEI VITROBOT MARK I / Method: blot for 2-4 seconds before plunging

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Electron microscopy

MicroscopeFEI TITAN KRIOS
DateOct 16, 2014
Image recordingCategory: CCD / Film or detector model: FEI FALCON II (4k x 4k) / Number real images: 7707 / Average electron dose: 20 e/Å2 / Details: Automated data collection using EPU
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 130293 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 4.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 75000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionDetails: CTFFIND3
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 5.8 Å / Resolution method: OTHER / Software - Name: spider
Details: To avoid overfitting, the data was refined in a resolution-limited scheme using SPIDER.
Number images used: 44419

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