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- EMDB-37994: dormant ribosome with STM1 -

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Basic information

Entry
Database: EMDB / ID: EMD-37994
Titledormant ribosome with STM1
Map data
Sample
  • Complex: dormant ribosome
KeywordsRibosome / STM1
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.59 Å
AuthorsDu M / Zeng F
Funding support China, 4 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32171200 China
National Natural Science Foundation of China (NSFC)92169111 China
Shenzhen Science and Technology ProgramJCYJ20220530115210023 China
National Natural Science Foundation of China (NSFC)32100977 China
CitationJournal: Front Mol Biosci / Year: 2024
Title: Implication of Stm1 in the protection of eIF5A, eEF2 and tRNA through dormant ribosomes.
Authors: Mengtan Du / Xin Li / Wanlin Dong / Fuxing Zeng /
Abstract: Dormant ribosomes are typically associated with preservation factors to protect themselves from degradation under stress conditions. Stm1/SERBP1 is one such protein that anchors the 40S and 60S ... Dormant ribosomes are typically associated with preservation factors to protect themselves from degradation under stress conditions. Stm1/SERBP1 is one such protein that anchors the 40S and 60S subunits together. Several proteins and tRNAs bind to this complex as well, yet the molecular mechanisms remain unclear. Here, we reported the cryo-EM structures of five newly identified Stm1/SERBP1-bound ribosomes. These structures highlighted that eIF5A, eEF2, and tRNA might bind to dormant ribosomes under stress to avoid their own degradation, thus facilitating protein synthesis upon the restoration of growth conditions. In addition, Ribo-seq data analysis reflected the upregulation of nutrient, metabolism, and external-stimulus-related pathways in the strain, suggesting possible regulatory roles of Stm1. The knowledge generated from the present work will facilitate in better understanding the molecular mechanism of dormant ribosomes.
History
DepositionNov 7, 2023-
Header (metadata) releaseJan 31, 2024-
Map releaseJan 31, 2024-
UpdateAug 21, 2024-
Current statusAug 21, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_37994.png

Downloads & links

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Map

FileDownload / File: emd_37994.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 384 pix.
= 414.72 Å		1.08 Å/pix.
x 384 pix.
= 414.72 Å		1.08 Å/pix.
x 384 pix.
= 414.72 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.005
Minimum - Maximum-0.022501789 - 0.041724224
Average (Standard dev.)0.000041216736 (±0.0022085425)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 414.72003 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_37994_half_map_1.map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_37994_half_map_2.map
Projections & Slices
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Sample components

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Entire : dormant ribosome

EntireName: dormant ribosome
Components
  • Complex: dormant ribosome

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Supramolecule #1: dormant ribosome

SupramoleculeName: dormant ribosome / type: complex / ID: 1 / Parent: 0 / Details: dormant ribosome purified from yeast
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)

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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
Details: 50mM HEPES, pH 7.4, 100 mM KOAc, 5 mM Mg(OAc)2, 1mM DTT
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 4 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR
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: GATAN K3 (6k x 4k) / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7rr5

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.59 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 80383
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.1.0)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.1.0)
Final 3D classificationSoftware - Name: RELION (ver. 3.1.0)
FSC plot (resolution estimation)

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