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- EMDB-71443: In situ human 80S ribosome (Focused on 40S head) -

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Basic information

Entry
Database: EMDB / ID: EMD-71443
TitleIn situ human 80S ribosome (Focused on 40S head)
Map data
Sample
  • Complex: In situ human ribosome (Focused on 40S with SERBP1 CTD)
KeywordsIn situ / RIBOSOME
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.64 Å
AuthorsWei Z / Yong Z
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2025
Title: Visualizing the translation landscape in human cells at high resolution.
Authors: Wei Zheng / Yuekang Zhang / Jimin Wang / Shuhui Wang / Pengxin Chai / Elizabeth J Bailey / Chenghao Zhu / Wangbiao Guo / Swapnil C Devarkar / Shenping Wu / Jianfeng Lin / Kai Zhang / Jun Liu ...Authors: Wei Zheng / Yuekang Zhang / Jimin Wang / Shuhui Wang / Pengxin Chai / Elizabeth J Bailey / Chenghao Zhu / Wangbiao Guo / Swapnil C Devarkar / Shenping Wu / Jianfeng Lin / Kai Zhang / Jun Liu / Ivan B Lomakin / Yong Xiong /
Abstract: Comprehensive in situ structures of macromolecules can transform our understanding of biology and advance human health. Here, we map protein synthesis inside human cells in detail by combining ...Comprehensive in situ structures of macromolecules can transform our understanding of biology and advance human health. Here, we map protein synthesis inside human cells in detail by combining automated cryo-focused ion beam (FIB) milling and in situ single-particle cryo electron microscopy (cryo-EM). With this in situ cryo-EM approach, we resolved a 2.2 Å consensus structure of the human 80S ribosome and unveiled 23 functional states, nearly all better than 3 Å resolution. Compared to in vitro studies, we observed variations in ribosome structures, distinct environments of ion and polyamine binding, and associated proteins such as EDF1 and NACβ that are typically not enriched with purified ribosomes. We also detected additional peptide-related density features on the ribosome and visualized ribosome-ribosome interactions in helical polysomes. Finally, high-resolution structures from cells treated with homoharringtonine and cycloheximide revealed a distinct translational landscape and a spermidine that interacts with cycloheximide at the E site, one of the numerous polyamines that also bind native ribosomes. These results underscore the value of high-resolution in situ studies in the native environment.
History
DepositionJun 25, 2025-
Header (metadata) releaseDec 24, 2025-
Map releaseDec 24, 2025-
UpdateDec 24, 2025-
Current statusDec 24, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_71443.png

Downloads & links

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Map

FileDownload / File: emd_71443.map.gz / Format: CCP4 / Size: 729 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.)
0.89 Å/pix.
x 576 pix.
= 512.64 Å		0.89 Å/pix.
x 576 pix.
= 512.64 Å		0.89 Å/pix.
x 576 pix.
= 512.64 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.89 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0148
Minimum - Maximum-0.043882724 - 0.1709763
Average (Standard dev.)0.00037815172 (±0.004933749)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions576576576
Spacing576576576
CellA=B=C: 512.64 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_71443_msk_1.map
Projections & Slices
AxesZYX

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Half map: #1

Fileemd_71443_half_map_1.map
Projections & Slices
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Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_71443_half_map_2.map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : In situ human ribosome (Focused on 40S with SERBP1 CTD)

EntireName: In situ human ribosome (Focused on 40S with SERBP1 CTD)
Components
  • Complex: In situ human ribosome (Focused on 40S with SERBP1 CTD)

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Supramolecule #1: In situ human ribosome (Focused on 40S with SERBP1 CTD)

SupramoleculeName: In situ human ribosome (Focused on 40S with SERBP1 CTD)
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation statecell

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TECNAI F30
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Tecnai F30 / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.64 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 1272627
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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