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- EMDB-66485: Cryo-EM structure of SecM-arrested 70S ribosome with YheS, local-... -

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Basic information

Entry
Database: EMDB / ID: EMD-66485
TitleCryo-EM structure of SecM-arrested 70S ribosome with YheS, local-masked refined map on the SSU head.
Map data
Sample
  • Complex: 70S ribosome with YheS
KeywordsSecM / ribosome arrest / ABCF / RIBOSOME
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.89 Å
AuthorsIso K / Ando Y / Taguchi H / Nureki O / Chadani Y / Itoh Y
Funding support Japan, 1 items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS) Japan
CitationJournal: Nat Commun / Year: 2026
Title: Structural insights into YheS-mediated release of SecM-arrested ribosome.
Authors: Kaishi Iso / Toma Ikeda / Kohei Yamasaki / Yushin Ando / Fumiya K Sano / Tadaomi Furuta / Hideki Taguchi / Osamu Nureki / Yuhei Chadani / Yuzuru Itoh /
Abstract: ATP-binding cassette subfamily F (ABCF) proteins interact with the ribosome to resolve translation defects near the peptidyl transferase center (PTC). In Escherichia coli, four ABCF proteins (EttA, ...ATP-binding cassette subfamily F (ABCF) proteins interact with the ribosome to resolve translation defects near the peptidyl transferase center (PTC). In Escherichia coli, four ABCF proteins (EttA, Uup, YbiT, and YheS) selectively promote translation of distinct problematic nascent peptide sequences, but their molecular mechanisms remain unclear. Here, we present a 2.8 Å cryo-EM structure of the ribosome in complex with an ATPase-deficient mutant of YheS and investigate how it releases ribosomes arrested by the SecM nascent chain. YheS binds to the ribosomal E-site via the L1 stalk, and its P-site tRNA-interaction motif (PtIM) extends toward the PTC, displacing the CCA end of the P-site tRNA. Notably, the cryo-EM density corresponding to the SecM nascent chain within the exit tunnel is largely lost upon YheS binding. These observations suggest that YheS relieves peptide sequence-dependent stalling by perturbing nascent chain-tunnel interactions through P-site tRNA relocation. Steered molecular dynamics simulations provide qualitative support for this model. Together, our findings provide mechanistic insight into a mode of arrest release distinct from the translocon-mediated release mechanism.
History
DepositionOct 7, 2025-
Header (metadata) releaseJun 17, 2026-
Map releaseJun 17, 2026-
UpdateJun 17, 2026-
Current statusJun 17, 2026Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_66485.png

Downloads & links

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Map

FileDownload / File: emd_66485.map.gz / Format: CCP4 / Size: 244.1 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 400 pix.
= 431.6 Å		1.08 Å/pix.
x 400 pix.
= 431.6 Å		1.08 Å/pix.
x 400 pix.
= 431.6 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.079 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.8
Minimum - Maximum-4.2875876 - 7.152455
Average (Standard dev.)0.0073883804 (±0.14035518)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 431.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_66485_msk_1.map
Projections & Slices
AxesZYX

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Half map: #2

Fileemd_66485_half_map_1.map
Projections & Slices
AxesZYX

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Half map: #1

Fileemd_66485_half_map_2.map
Projections & Slices
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Sample components

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Entire : 70S ribosome with YheS

EntireName: 70S ribosome with YheS
Components
  • Complex: 70S ribosome with YheS

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Supramolecule #1: 70S ribosome with YheS

SupramoleculeName: 70S ribosome with YheS / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#55, #57-#58
Source (natural)Organism: Escherichia coli (E. coli)

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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: 7.3
GridModel: Quantifoil R2/1 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
SoftwareName: EPU
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 18200 / 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 / Cs: 2.7 mm / Nominal defocus max: 1.6 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 165000
Sample stageCooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 1770974
CTF correctionSoftware - Name: cryoSPARC / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 2.89 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 50797
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC / Details: Ab-initio reconstruction
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final 3D classificationNumber classes: 2 / Software - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

8b0x

source_name: PDB, initial_model_type: experimental model

8qoa

source_name: PDB, initial_model_type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT

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