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- EMDB-61457: The tail-complex structure of phage P22 -

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Basic information

Entry
Database: EMDB / ID: EMD-61457
TitleThe tail-complex structure of phage P22
Map dataThe FSC curves provided are based on unmasked data. We think that the sharp drop-off observed in the FSC curves is due to the fact that the volume of the local density map was too small.
Sample
  • Complex: Salmonella phage P22
    • Protein or peptide: Portal protein
    • Protein or peptide: Endorhamnosidase
    • Protein or peptide: Phage stabilisation protein
    • Protein or peptide: P22 tail accessory factor
KeywordsComplex / VIRAL PROTEIN
Function / homology
Function and homology information


Bacteriophage P22, Gp10, DNA-stabilising / Phage stabilisation protein / Tail accessory factor GP4 / Peptidoglycan hydrolase Gp4 superfamily / P22 tail accessory factor / Phage P22-like portal protein / Phage P22-like portal protein / P22 tailspike C-terminal domain / Salmonella phage P22 tail-spike / Bacteriophage P22 tailspike, N-terminal ...Bacteriophage P22, Gp10, DNA-stabilising / Phage stabilisation protein / Tail accessory factor GP4 / Peptidoglycan hydrolase Gp4 superfamily / P22 tail accessory factor / Phage P22-like portal protein / Phage P22-like portal protein / P22 tailspike C-terminal domain / Salmonella phage P22 tail-spike / Bacteriophage P22 tailspike, N-terminal / Phage P22 tailspike-like, N-terminal domain superfamily / Head binding / Autotransporter, pectate lyase C-like domain superfamily / Pectin lyase fold/virulence factor
Similarity search - Domain/homology
Endorhamnosidase / Portal protein / Phage stabilisation protein / P22 tail accessory factor
Similarity search - Component
Biological speciesSalmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.21 Å
AuthorsLiu HR / Xiao H
Funding support China, 3 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)12034006 China
National Natural Science Foundation of China (NSFC)32071209 China
National Natural Science Foundation of China (NSFC)32401014 China
CitationJournal: PLoS Biol / Year: 2025
Title: Structure of the scaffolding protein and portal within the bacteriophage P22 procapsid provides insights into the self-assembly process.
Authors: Hao Xiao / Wenyuan Chen / Hao Pang / Jing Zheng / Li Wang / Hao Feng / Jingdong Song / Lingpeng Cheng / Hongrong Liu /
Abstract: In the assembly pathway of tailed double-stranded DNA (dsDNA) bacteriophages and herpesviruses, a procapsid with a dodecameric portal for DNA delivery at a unique vertex is initially formed. ...In the assembly pathway of tailed double-stranded DNA (dsDNA) bacteriophages and herpesviruses, a procapsid with a dodecameric portal for DNA delivery at a unique vertex is initially formed. Appropriate procapsid assembly requires the transient presence of multiple copies of a scaffolding protein (SP), which is absent in the mature virion. However, how the SP contributes to dodecameric portal formation, facilitates portal and coat protein incorporation, and is subsequently released remains unclear because of a lack of structural information. Here, we present the structure of the SP-portal complex within the procapsid of bacteriophage P22 at 3-9 Å resolutions. The AlphaFold2-predicted SP model fits well with the density map of the complex. The SP forms trimers and tetramers that interact to yield a dome-like complex on the portal. Two SP domains mediate multimerization. Each trimer interacts with two neighboring portal subunits. The SP has a loop-hook-like structure that aids in coat protein recruitment during viral assembly. The loops of those SP subunits on the portal are positioned in clefts between adjacent portal subunits. Conformational changes in the portal during phage maturation may trigger the disassembly and release of the SP complex. Our findings provide insights into SP-assisted procapsid assembly in bacteriophage P22 and suggest that this strategy is also implemented by other dsDNA viruses, including herpesviruses.
History
DepositionSep 6, 2024-
Header (metadata) releaseFeb 26, 2025-
Map releaseFeb 26, 2025-
UpdateApr 30, 2025-
Current statusApr 30, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_61457.png

Downloads & links

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Map

FileDownload / File: emd_61457.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThe FSC curves provided are based on unmasked data. We think that the sharp drop-off observed in the FSC curves is due to the fact that the volume of the local density map was too small.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.36 Å/pix.
x 400 pix.
= 544. Å		1.36 Å/pix.
x 400 pix.
= 544. Å		1.36 Å/pix.
x 400 pix.
= 544. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.36 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 3.0
Minimum - Maximum-16.371438999999999 - 30.704418
Average (Standard dev.)0.0046569165 (±1.2371043)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 544.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_61457_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_61457_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Salmonella phage P22

EntireName: Salmonella phage P22 (virus)
Components
  • Complex: Salmonella phage P22
    • Protein or peptide: Portal protein
    • Protein or peptide: Endorhamnosidase
    • Protein or peptide: Phage stabilisation protein
    • Protein or peptide: P22 tail accessory factor

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Supramolecule #1: Salmonella phage P22

SupramoleculeName: Salmonella phage P22 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)

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Macromolecule #1: Portal protein

MacromoleculeName: Portal protein / type: protein_or_peptide / ID: 1 / Number of copies: 12 / Enantiomer: LEVO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Molecular weightTheoretical: 82.829375 KDa
SequenceString: MADNENRLES ILSRFDADWT ASDEARREAK NDLFFSRVSQ WDDWLSQYTT LQYRGQFDVV RPVVRKLVSE MRQNPIDVLY RPKDGARPD AADVLMGMYR TDMRHNTAKI AVNIAVREQI EAGVGAWRLV TDYEDQSPTS NNQVIRREPI HSACSHVIWD S NSKLMDKS ...String:
MADNENRLES ILSRFDADWT ASDEARREAK NDLFFSRVSQ WDDWLSQYTT LQYRGQFDVV RPVVRKLVSE MRQNPIDVLY RPKDGARPD AADVLMGMYR TDMRHNTAKI AVNIAVREQI EAGVGAWRLV TDYEDQSPTS NNQVIRREPI HSACSHVIWD S NSKLMDKS DARHCTVIHS MSQNGWEDFA EKYDLDADDI PSFQNPNDWV FPWLTQDTIQ IAEFYEVVEK KETAFIYQDP VT GEPVSYF KRDIKDVIDD LADSGFIKIA ERQIKRRRVY KSIITCTAVL KDKQLIAGEH IPIVPVFGEW GFVEDKEVYE GVV RLTKDG QRLRNMIMSF NADIVARTPK KKPFFWPEQI AGFEHMYDGN DDYPYYLLNR TDENSGDLPT QPLAYYENPE VPQA NAYML EAATSAVKEV ATLGVDTEAV NGGQVAFDTV NQLNMRADLE TYVFQDNLAT AMRRDGEIYQ SIVNDIYDVP RNVTI TLED GSEKDVQLMA EVVDLATGEK QVLNDIRGRY ECYTDVGPSF QSMKQQNRAE ILELLGKTPQ GTPEYQLLLL QYFTLL DGK GVEMMRDYAN KQLIQMGVKK PETPEEQQWL VEAQQAKQGQ QDPAMVQAQG VLLQGQAELA KAQNQTLSLQ IDAAKVE AQ NQLNAARIAE IFNNMDLSKQ SEFREFLKTV ASFQQDRSED ARANAELLLK GDEQTHKQRM DIANILQSQR QNQPSGSV A ETPQ

UniProtKB: Portal protein

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Macromolecule #2: Endorhamnosidase

MacromoleculeName: Endorhamnosidase / type: protein_or_peptide / ID: 2 / Number of copies: 18 / Enantiomer: LEVO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Molecular weightTheoretical: 71.923523 KDa
SequenceString: MTDITANVVV SNPRPIFTES RSFKAVANGK IYIGQIDTDP VNPANQIPVY IENEDGSHVQ ITQPLIINAA GKIVYNGQLV KIVTVQGHS MAIYDANGSQ VDYIANVLKY DPDQYSIEAD KKFKYSVKLS DYPTLQDAAS AAVDGLLIDR DYNFYGGETV D FGGKVLTI ...String:
MTDITANVVV SNPRPIFTES RSFKAVANGK IYIGQIDTDP VNPANQIPVY IENEDGSHVQ ITQPLIINAA GKIVYNGQLV KIVTVQGHS MAIYDANGSQ VDYIANVLKY DPDQYSIEAD KKFKYSVKLS DYPTLQDAAS AAVDGLLIDR DYNFYGGETV D FGGKVLTI ECKAKFIGDG NLIFTKLGKG SRIAGVFMES TTTPWVIKPW TDDNQWLTDA AAVVATLKQS KTDGYQPTVS DY VKFPGIE TLLPPNAKGQ NITSTLEIRE CIGVEVHRAS GLMAGFLFRG CHFCKMVDAN NPSGGKDGII TFENLSGDWG KGN YVIGGR TSYGSVSSAQ FLRNNGGFER DGGVIGFTSY RAGESGVKTW QGTVGSTTSR NYNLQFRDSV VIYPVWDGFD LGAD TDMNP ELDRPGDYPI TQYPLHQLPL NHLIDNLLVR GALGVGFGMD GKGMYVSNIT VEDCAGSGAY LLTHESVFTN IAIID TNTK DFQANQIYIS GACRVNGLRL IGIRSTDGQG LTIDAPNSTV SGITGMVDPS RINVANLAEE GLGNIRANSF GYDSAA IKL RIHKLSKTLD SGALYSHING GAGSGSAYTQ LTAISGSTPD AVSLKVNHKD CRGAEIPFVP DIASDDFIKD SSCFLPY WE NNSTSLKALV KKPNGELVRL TLATL

UniProtKB: Endorhamnosidase

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Macromolecule #3: Phage stabilisation protein

MacromoleculeName: Phage stabilisation protein / type: protein_or_peptide / ID: 3 / Number of copies: 6 / Enantiomer: LEVO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Molecular weightTheoretical: 52.51202 KDa
SequenceString: MPIQQLPMMK GMGKDFKNAD YIDYLPVNML ATPKEILNSS GYLRSFPGIT KRYDMNGVSR GVEYNTAQNA VYRVCGGKLY KGESEVGDV AGSGRVSMAH GRTSQAVGVN GQLVEYRYDG TVKTVSNWPA DSGFTQYELG SVRDITRLRG RYAWSKDGTD S WFITDLED ...String:
MPIQQLPMMK GMGKDFKNAD YIDYLPVNML ATPKEILNSS GYLRSFPGIT KRYDMNGVSR GVEYNTAQNA VYRVCGGKLY KGESEVGDV AGSGRVSMAH GRTSQAVGVN GQLVEYRYDG TVKTVSNWPA DSGFTQYELG SVRDITRLRG RYAWSKDGTD S WFITDLED ESHPDRYSAQ YRAESQPDGI IGIGTWRDFI VCFGSSTIEY FSLTGATTAG AALYVAQPSL MVQKGIAGTY CK TPFADSY AFISHPATGA PSVYIIGSGQ ASPIATASIE KIIRSYTAEE MATGVMETLR FDSHELLIIH LPRHVLVYDA SSS QNGPQW CVLKTGLYDD VYRGVDFMYE GNQITCGDKS EAVVGQLQFD ISSQYDKQQE HLLFTPLFKA DNARCFDLEV ESST GVAQY ADRLFLSATT DGINYGREQM IEQNEPFVYD KRVLWKRVGR IRRLIGFKLR VITKSPVTLS GCQIRLE

UniProtKB: Phage stabilisation protein

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Macromolecule #4: P22 tail accessory factor

MacromoleculeName: P22 tail accessory factor / type: protein_or_peptide / ID: 4 / Number of copies: 12 / Enantiomer: LEVO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Molecular weightTheoretical: 18.044959 KDa
SequenceString:
MQIKTKGDLV RAALRKLGVA SDATLTDVEP QSMQDAVDDL EAMMAEWYQD GKGIITGYVF SDDENPPAEG DDHGLRSSAV SAVFHNLAC RIAPDYALEA TAKIIATAKY GKELLYKQTA ISRAKRAPYP SRMPTGSGNS FANLNEWHYF PGEQNADSTT P HDEGNG

UniProtKB: P22 tail accessory factor

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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 (6k x 4k) / Average electron dose: 32.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.21 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 82501
Initial angle assignmentType: COMMON LINE
Final angle assignmentType: COMMON LINE
FSC plot (resolution estimation)

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