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- EMDB-55957: Phage 812 baseplate in the pre-contraction state - lower arm (seg... -

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Basic information

Entry
Database: EMDB / ID: EMD-55957
TitlePhage 812 baseplate in the pre-contraction state - lower arm (segment C)
Map dataPhage 812 baseplate in the pre-contraction state - lower arm (segment C); postprocessed map
Sample
  • Virus: Staphylococcus phage 812K1/420 (virus)
    • Protein or peptide: ORF63
    • Protein or peptide: ORF68
    • Protein or peptide: ORF64
Keywordsphage / baseplate / VIRUS
Function / homology: / ORF68-like, C-terminal domain / : / Baseplate wedge 3 tail fiber network component / ORF68 / ORF64 / ORF63
Function and homology information
Biological speciesStaphylococcus phage 812K1/420 (virus)
Methodsingle particle reconstruction / cryo EM / Resolution: 6.0 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_55957.png

Downloads & links

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Map

FileDownload / File: emd_55957.map.gz / Format: CCP4 / Size: 22.2 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPhage 812 baseplate in the pre-contraction state - lower arm (segment C); postprocessed map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.67 Å/pix.
x 180 pix.
= 300.096 Å		1.67 Å/pix.
x 180 pix.
= 300.096 Å		1.67 Å/pix.
x 180 pix.
= 300.096 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.6672 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.035
Minimum - Maximum-0.07120881 - 0.12946329
Average (Standard dev.)0.00026205092 (±0.003987854)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions180180180
Spacing180180180
CellA=B=C: 300.096 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_55957_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 pre-contraction state -...

Fileemd_55957_half_map_1.map
AnnotationPhage 812 baseplate in the pre-contraction state - lower arm (segment C); half map2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Phage 812 baseplate in the pre-contraction state -...

Fileemd_55957_half_map_2.map
AnnotationPhage 812 baseplate in the pre-contraction state - lower arm (segment C); half map1
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)
    • Protein or peptide: ORF63
    • Protein or peptide: ORF68
    • Protein or peptide: ORF64

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Supramolecule #1: Staphylococcus phage 812K1/420

SupramoleculeName: Staphylococcus phage 812K1/420 / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all
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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Macromolecule #1: ORF63

MacromoleculeName: ORF63 / type: protein_or_peptide / ID: 1 / Details: arm scaffold protein / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Staphylococcus phage 812K1/420 (virus)
Molecular weightTheoretical: 116.389945 KDa
SequenceString: MANFLKNLHP LLRRDRNKKD NQDPNFALID ALNEEMNQVE KDAIESKLQS SLKTSTSEYL DKFGDWFGVY RKTDEKDDVY RARIIKYLL LKRGTNNAII DAIKDYLGRD DIDVSVYEPF TNIFYTNKSH LNGEDHLMGY YYRFAVINVS IGDYFPVEII D VINEFKPA ...String:
MANFLKNLHP LLRRDRNKKD NQDPNFALID ALNEEMNQVE KDAIESKLQS SLKTSTSEYL DKFGDWFGVY RKTDEKDDVY RARIIKYLL LKRGTNNAII DAIKDYLGRD DIDVSVYEPF TNIFYTNKSH LNGEDHLMGY YYRFAVINVS IGDYFPVEII D VINEFKPA GVTLYVTYDG ASTIRGGAII KWLDGLPKIE TYQEFDRFTG YDDTFYGHIN MNQSKDTDNS SSDIFKTNHS LI NSLDVLT GSSSVGRQYI NYGYVTSYVY NPGMTSSVNQ ISASTEGRGQ EVPTDYYMYT STKNNNTVEL SMQTTSGVSY LYN NFNFRD YMSKYRPQVD LQSDEARRIV SDYIKELSID YYLSAVIPPD ESIEIKLQVY DFSINRWLTV SINNLSFYEK NIGS NIGYI KDYLNSELNM FTRLEINAGK RDSVDIKVNY LDLMFYYYER GIYTIKPYKA LIENYLDISR ETYVEAFKIA SLSNG DIIT KTGFQPIGYL KLVGNYENTI PSTINIVAKD TDNNPIESNE LDVYNTVENR NLLQSYKGVN TIAREITSTK EFTVSG WAK EIYSTNYLSK VLKPGKVYTL SFDMEITGND PTLKSYSDNH GIYLYSNTKG IVVNGVKSME RTIGNKVSVT QTFTAPT IT DHRLLIYTGR YTSDGKASTP PVFFNTVKIT ELKLTEGSSK LEYSPAPEDK PNVIEKGIKF NNILTNIQTL SINSDTIL K NVTLYYSYYG DSWVELKTLG NISTGETTET NNLIDLYGLQ TVDYSNINPM SKVSLRSIWN VKLGELNNQE GSLSNMPND YFNAVWQDID KLSDIELGSM RMVKDTEGGV FDGATGEIIK ATLFNVGAYT DLDMLAYTLT NYTEPLTLGS SRLISELKEE LLTSESFNV DNRIKVIDSI YEELPNTSII KNGFVEREVT GSKYLDYGLY EPIEDGTRYK LIVEGEFKDN IEFISLYNSN P NFNETFIY PSEIINGVAE KEFIAKPSTE DKPRLNTDVR IYIRPYDSTI SKVRRVELRK V

UniProtKB: ORF63

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Macromolecule #2: ORF68

MacromoleculeName: ORF68 / type: protein_or_peptide / ID: 2 / Details: receptor-binding protein 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Staphylococcus phage 812K1/420 (virus)
Molecular weightTheoretical: 50.474078 KDa
SequenceString: MALNFTTITE NNVIRDLTTQ VNNIGEELTK ERNIFDITDD LVYNFNKSQK IKLTDDKGLT KSYGNITALR DIKEPGYYYI GARTLATLL DRPDMESLDV VLHVVPLDTS SKVVQHLYTL STNNNQIKML YRFVSGNSSS EWQFIQGLPS NKNAVISGTN I LDIASPGV ...String:
MALNFTTITE NNVIRDLTTQ VNNIGEELTK ERNIFDITDD LVYNFNKSQK IKLTDDKGLT KSYGNITALR DIKEPGYYYI GARTLATLL DRPDMESLDV VLHVVPLDTS SKVVQHLYTL STNNNQIKML YRFVSGNSSS EWQFIQGLPS NKNAVISGTN I LDIASPGV YFVMGMTGGM PSGVSSGFLD LSVDANDNRL ARLTDAETGK EYTSIKKPTG TYTAWKKEFE PKDMEKYLLS SI RDDGSAS FPLLVYTSDS KTFQQAIIDH IDRTGQTTFT FYVQGGVSGS PMSNSCRGLF MSDTPNTSSL HGVYNAIGTD GRN VTGSVV GSNWTSPKTS PSHKELWTGA QSFLSTGTTK NLSDDISNYS YVEVYTTHKT TEKTKGNDNT GTICHKFYLD GSGT YVCSG TFVSGDRTDT KPPITEFYRV GVSFKGSTWT LVDSAVQNSK TQYVTRIIGI NMP

UniProtKB: ORF68

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Macromolecule #3: ORF64

MacromoleculeName: ORF64 / type: protein_or_peptide / ID: 3 / Details: arm segment protein / Number of copies: 6 / Enantiomer: LEVO
Source (natural)Organism: Staphylococcus phage 812K1/420 (virus)
Molecular weightTheoretical: 19.259613 KDa
SequenceString:
MAIATYNSHV ELAKYLVSKA DSVYLTIGKS TPWSNETNPP QPDENATVLQ EVIGYKKATK VTLVRPSKSP EDDNKNLISY GNKSWVEVT PENAKAEGAK WVYLESSIVG DELPLGTYRQ VGFVMDLVAK SGISKFNLVP SEVESTGTLL FFDNKQFQNR S EQTTAKER FIVEV

UniProtKB: ORF64

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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
Component:
ConcentrationFormulaName
50.0 mMTristris
10.0 mMNaClsodium chloride
10.0 mMCaCl2calcium chloride
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV
Details10e9 PFU/ml

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number real images: 26731 / Average exposure time: 2.0 sec. / Average electron dose: 40.8 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: 0.5 µm / Nominal magnification: 105000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 64874
CTF correctionSoftware - Name: Gctf / Type: PHASE FLIPPING ONLY
Startup modelType of model: EMDB MAP
EMDB ID:

8210

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 6.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 5) / Number images used: 6229
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 5)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 5)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Overall B value: 123.3
Output model

PDB-9tii:
Phage 812 baseplate in the pre-contraction state - lower arm (segment C)

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