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- EMDB-9236: Rabbit 80S ribosome with a Z-site tRNA (unrotated state) -

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Basic information

Entry
Database: EMDB / ID: EMD-9236
TitleRabbit 80S ribosome with a Z-site tRNA (unrotated state)
Map dataPostprocessed map
Sample
  • Complex: Rabbit 80S ribosome with a Z-site tRNA (unrotated state)
Biological speciesOryctolagus cuniculus (rabbit)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.2 Å
AuthorsBrown A / Baird MR / Yip MCJ / Murray J / Shao S
CitationJournal: Elife / Year: 2018
Title: Structures of translationally inactive mammalian ribosomes.
Authors: Alan Brown / Matthew R Baird / Matthew Cj Yip / Jason Murray / Sichen Shao /
Abstract: The cellular levels and activities of ribosomes directly regulate gene expression during numerous physiological processes. The mechanisms that globally repress translation are incompletely understood. ...The cellular levels and activities of ribosomes directly regulate gene expression during numerous physiological processes. The mechanisms that globally repress translation are incompletely understood. Here, we use electron cryomicroscopy to analyze inactive ribosomes isolated from mammalian reticulocytes, the penultimate stage of red blood cell differentiation. We identify two types of ribosomes that are translationally repressed by protein interactions. The first comprises ribosomes sequestered with elongation factor 2 (eEF2) by SERPINE mRNA binding protein 1 (SERBP1) occupying the ribosomal mRNA entrance channel. The second type are translationally repressed by a novel ribosome-binding protein, interferon-related developmental regulator 2 (IFRD2), which spans the P and E sites and inserts a C-terminal helix into the mRNA exit channel to preclude translation. IFRD2 binds ribosomes with a tRNA occupying a noncanonical binding site, the 'Z site', on the ribosome. These structures provide functional insights into how ribosomal interactions may suppress translation to regulate gene expression.
History
DepositionOct 19, 2018-
Header (metadata) releaseNov 14, 2018-
Map releaseNov 14, 2018-
UpdateDec 2, 2020-
Current statusDec 2, 2020Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.06
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by height
  • Surface level: 0.06
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_9236.png

Downloads & links

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Map

FileDownload / File: emd_9236.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPostprocessed map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.34 Å/pix.
x 400 pix.
= 536. Å		1.34 Å/pix.
x 400 pix.
= 536. Å		1.34 Å/pix.
x 400 pix.
= 536. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.34 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.06 / Movie #1: 0.06
Minimum - Maximum-0.29542607 - 0.4662884
Average (Standard dev.)0.0017341737 (±0.018329024)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 536.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.341.341.34
M x/y/z400400400
origin x/y/z0.0000.0000.000
length x/y/z536.000536.000536.000
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ360360360
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS400400400
D min/max/mean-0.2950.4660.002

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Supplemental data

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Additional map: Pre-postprocessed map

Fileemd_9236_additional.map
AnnotationPre-postprocessed map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Pre-postprocessed map

Fileemd_9236_additional_1.map
AnnotationPre-postprocessed map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map 2

Fileemd_9236_half_map_1.map
AnnotationHalf map 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map 1

Fileemd_9236_half_map_2.map
AnnotationHalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Rabbit 80S ribosome with a Z-site tRNA (unrotated state)

EntireName: Rabbit 80S ribosome with a Z-site tRNA (unrotated state)
Components
  • Complex: Rabbit 80S ribosome with a Z-site tRNA (unrotated state)

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Supramolecule #1: Rabbit 80S ribosome with a Z-site tRNA (unrotated state)

SupramoleculeName: Rabbit 80S ribosome with a Z-site tRNA (unrotated state)
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Oryctolagus cuniculus (rabbit) / Location in cell: cytoplasm

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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: 7.4
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK II

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Digitization - Frames/image: 1-17 / Average exposure time: 1.1 sec. / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 104478 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: Gctf
Startup modelType of model: EMDB MAP
EMDB ID:

4129

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.0) / Number images used: 10783
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.0)
FSC plot (resolution estimation)

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