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- EMDB-55966: Phage 812 baseplate in the post-contraction state (C1) -

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Basic information

Entry
Database: EMDB / ID: EMD-55966
TitlePhage 812 baseplate in the post-contraction state (C1)
Map dataPhage 812 baseplate in the post-contraction state (C1); postprocessed map
Sample
  • Virus: Staphylococcus phage 812K1/420 (virus)
Keywordsphage / baseplate / VIRUS
Biological speciesStaphylococcus phage 812K1/420 (virus)
Methodsingle particle reconstruction / cryo EM / Resolution: 6.6 Å
AuthorsBinovsky J / Plevka P
Funding supportEuropean Union, Czech Republic, 2 items
OrganizationGrant numberCountry
European Research Council (ERC)101043452European Union
Other governmentLX22NP05103 Czech Republic
CitationJournal: EMBO J / Year: 2026
Title: Conformational changes of the baseplate regulating tail contraction of Staphylococcus phage 812.
Authors: Ján Bíňovský / Marta Šiborová / Maryna Zlatohurska / Jiří Nováček / Pavol Bárdy / Roman Baška / Karel Škubník / Tibor Botka / Martin Benešík / Roman Pantůček / Konstantinos ...Authors: Ján Bíňovský / Marta Šiborová / Maryna Zlatohurska / Jiří Nováček / Pavol Bárdy / Roman Baška / Karel Škubník / Tibor Botka / Martin Benešík / Roman Pantůček / Konstantinos Tripsianes / Pavel Plevka /
Abstract: Phages with contractile tails employ elaborate mechanisms to penetrate bacterial cell walls and deliver their genomes into the host cytoplasm. Here, we used cryo-EM to show that the baseplate of ...Phages with contractile tails employ elaborate mechanisms to penetrate bacterial cell walls and deliver their genomes into the host cytoplasm. Here, we used cryo-EM to show that the baseplate of phage 812, a member of the Kayvirus genus, which infects Gram-positive Staphylococcus strains, is formed of a core, wedge modules, and baseplate arms carrying receptor-binding proteins 1 and 2 and tripod complexes. Upon binding to a host cell, the receptor-binding proteins of phage 812 baseplate reorient and undergo conformational changes. The changes to the tripod complexes trigger the release of the central spike and weld proteins, which expose peptidoglycan-degrading domains of the hub proteins. Changes in the positions of baseplate arms are transmitted through wedge modules to tail sheath initiator proteins. The ring of the tail sheath initiator proteins expands and triggers the contraction of the tail sheath, which shortens to 50% and pushes the tail tube 10-30 nm into the bacterial cytoplasm. Homologous molecular mechanisms are probably shared by phages of the Herelleviridae family with contractile tails to infect Gram-positive bacteria.
History
DepositionDec 5, 2025-
Header (metadata) releaseMay 20, 2026-
Map releaseMay 20, 2026-
UpdateJul 8, 2026-
Current statusJul 8, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_55966.png

Downloads & links

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Map

FileDownload / File: emd_55966.map.gz / Format: CCP4 / Size: 1000 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPhage 812 baseplate in the post-contraction state (C1); postprocessed map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
2.11 Å/pix.
x 640 pix.
= 1350.4 Å		2.11 Å/pix.
x 640 pix.
= 1350.4 Å		2.11 Å/pix.
x 640 pix.
= 1350.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 2.11 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.02
Minimum - Maximum-0.041927192 - 0.12409742
Average (Standard dev.)0.0001888695 (±0.0027213213)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions640640640
Spacing640640640
CellA=B=C: 1350.3999 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_55966_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Phage 812 baseplate in the post-contraction state (C1); half map1

Fileemd_55966_half_map_1.map
AnnotationPhage 812 baseplate in the post-contraction state (C1); half map1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Phage 812 baseplate in the post-contraction state (C1); half map2

Fileemd_55966_half_map_2.map
AnnotationPhage 812 baseplate in the post-contraction state (C1); half map2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Staphylococcus phage 812K1/420

EntireName: Staphylococcus phage 812K1/420 (virus)
Components
  • Virus: Staphylococcus phage 812K1/420 (virus)

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Supramolecule #1: Staphylococcus phage 812K1/420

SupramoleculeName: Staphylococcus phage 812K1/420 / type: virus / ID: 1 / Parent: 0 / Macromolecule list: #1-#10
Details: Propagated in S. aureus SA 812 (CCM 4028) planktonic culture and purified on a CsCl gradient.
NCBI-ID: 3434241 / Sci species name: Staphylococcus phage 812K1/420 / Virus type: VIRION / Virus isolate: STRAIN / Virus enveloped: No / Virus empty: No

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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: 8 / Details: 50mM Tris, 10mM NaCl, 10mM CaCl2
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Digitization - Frames/image: 1-40 / Number real images: 15371 / Average exposure time: 7.0 sec. / Average electron dose: 42.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 130000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 54841
CTF correctionSoftware - Name: Gctf / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
EMDB ID:

8212

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 6.6 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 5.0) / Number images used: 21264
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 4.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 4.0)
FSC plot (resolution estimation)

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