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- EMDB-71106: YsxC-GTP treated 44.5SYsxC particles. Class 3 -

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Basic information

Entry
Database: EMDB / ID: EMD-71106
TitleYsxC-GTP treated 44.5SYsxC particles. Class 3
Map dataYsxC-GTP treated 44.5SYsxC particles. Class 3
Sample
  • Complex: 44.5SYsxC particles isolated from YsxC-depleted cells. Class 1.
KeywordsRibosome / 44.5S particle / YsxC
Biological speciesBacillus subtilis (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsOrtega J / Seffouh A
Funding support Canada, 1 items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR) Canada
CitationJournal: Nucleic Acids Res / Year: 2025
Title: YsxC is a placeholder for ribosomal protein uL2 during 50S ribosomal subunit assembly.
Authors: Amal Seffouh / Dominic Arpin / Kaustuv Basu / Joaquin Ortega /
Abstract: The maturation of the functional core of the 50S ribosomal subunit in Bacillus subtilis is assisted by assembly factors that enhance the efficiency of the process. Two essential assembly factors, the ...The maturation of the functional core of the 50S ribosomal subunit in Bacillus subtilis is assisted by assembly factors that enhance the efficiency of the process. Two essential assembly factors, the GTPases RbgA and YphC, bind at or near the functional sites of the 50S subunit to promote the folding of ribosomal RNA helices that play key functional roles. YsxC is another GTPase involved in the maturation of the 50S subunit, whose function remains unknown. We demonstrate that YsxC aids 50S assembly through a drastically different mechanism. YsxC binds in the body of the 44.5S large ribosome assembly intermediate, occupying the site where uL2 binds and controls the timing in the folding of rRNA helices forming the binding site for uL2. It creates a "primordial" binding site that includes six out of the eleven rRNA helices forming the uL2 mature binding site. Once YsxC is released, uL2 binds to this "primordial" binding site, and the remaining helices that stabilize uL2 fold, and the entire region adopts the mature conformation. This role of YsxC functioning as a placeholder factor for ribosomal protein uL2 provides the first example of such a factor's involvement in the ribosome assembly process in bacteria.
History
DepositionJun 10, 2025-
Header (metadata) releaseNov 12, 2025-
Map releaseNov 12, 2025-
UpdateNov 12, 2025-
Current statusNov 12, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_71106.png

Downloads & links

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Map

FileDownload / File: emd_71106.map.gz / Format: CCP4 / Size: 343 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationYsxC-GTP treated 44.5SYsxC particles. Class 3
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.86 Å/pix.
x 448 pix.
= 383.04 Å		0.86 Å/pix.
x 448 pix.
= 383.04 Å		0.86 Å/pix.
x 448 pix.
= 383.04 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.855 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.06
Minimum - Maximum-0.080480546 - 0.28581744
Average (Standard dev.)0.0018515529 (±0.01286358)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions448448448
Spacing448448448
CellA=B=C: 383.04 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half Map A

Fileemd_71106_half_map_1.map
AnnotationHalf Map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half Map B

Fileemd_71106_half_map_2.map
AnnotationHalf Map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : 44.5SYsxC particles isolated from YsxC-depleted cells. Class 1.

EntireName: 44.5SYsxC particles isolated from YsxC-depleted cells. Class 1.
Components
  • Complex: 44.5SYsxC particles isolated from YsxC-depleted cells. Class 1.

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Supramolecule #1: 44.5SYsxC particles isolated from YsxC-depleted cells. Class 1.

SupramoleculeName: 44.5SYsxC particles isolated from YsxC-depleted cells. Class 1.
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Bacillus subtilis (bacteria)

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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

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (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: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 70995
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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