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- EMDB-41651: In situ cryo-EM structure of bacteriophage P22 portal protein: he... -

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Basic information

Entry
Database: EMDB / ID: EMD-41651
TitleIn situ cryo-EM structure of bacteriophage P22 portal protein: head-to-tail protein complex at 3.0A resolution
Map data
Sample
  • Virus: Salmonella phage P22 (virus)
    • Protein or peptide: Portal protein
    • Protein or peptide: Peptidoglycan hydrolase gp4
Keywordsphage / bacteriophage / portal protein / head-to-tail protein / gene product 1 (gp1) / gene product 4 (gp4 / STRUCTURAL PROTEIN / VIRAL PROTEIN
Function / homology
Function and homology information


viral DNA genome packaging, headful / symbiont entry into host cell via disruption of host cell wall peptidoglycan / viral portal complex / symbiont genome ejection through host cell envelope, short tail mechanism / symbiont entry into host cell via disruption of host cell envelope / viral DNA genome packaging / virus tail / virion assembly / hydrolase activity
Similarity search - Function
Tail accessory factor GP4 / Phage P22-like portal protein / Peptidoglycan hydrolase Gp4 superfamily / P22 tail accessory factor / Phage P22-like portal protein
Similarity search - Domain/homology
Portal protein / Peptidoglycan hydrolase gp4
Similarity search - Component
Biological speciesSalmonella phage P22 (virus)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsIglesias SM / Cingolani G / Feng-Hou C
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)GM140733 United States
CitationJournal: J Mol Biol / Year: 2023
Title: Molecular Architecture of Salmonella Typhimurium Virus P22 Genome Ejection Machinery.
Authors: Stephano M Iglesias / Ravi K Lokareddy / Ruoyu Yang / Fenglin Li / Daniel P Yeggoni / Chun-Feng David Hou / Makayla N Leroux / Juliana R Cortines / Justin C Leavitt / Mary Bird / Sherwood R ...Authors: Stephano M Iglesias / Ravi K Lokareddy / Ruoyu Yang / Fenglin Li / Daniel P Yeggoni / Chun-Feng David Hou / Makayla N Leroux / Juliana R Cortines / Justin C Leavitt / Mary Bird / Sherwood R Casjens / Simon White / Carolyn M Teschke / Gino Cingolani /
Abstract: Bacteriophage P22 is a prototypical member of the Podoviridae superfamily. Since its discovery in 1952, P22 has become a paradigm for phage transduction and a model for icosahedral viral capsid ...Bacteriophage P22 is a prototypical member of the Podoviridae superfamily. Since its discovery in 1952, P22 has become a paradigm for phage transduction and a model for icosahedral viral capsid assembly. Here, we describe the complete architecture of the P22 tail apparatus (gp1, gp4, gp10, gp9, and gp26) and the potential location and organization of P22 ejection proteins (gp7, gp20, and gp16), determined using cryo-EM localized reconstruction, genetic knockouts, and biochemical analysis. We found that the tail apparatus exists in two equivalent conformations, rotated by ∼6° relative to the capsid. Portal protomers make unique contacts with coat subunits in both conformations, explaining the 12:5 symmetry mismatch. The tail assembles around the hexameric tail hub (gp10), which folds into an interrupted β-propeller characterized by an apical insertion domain. The tail hub connects proximally to the dodecameric portal protein and head-to-tail adapter (gp4), distally to the trimeric tail needle (gp26), and laterally to six trimeric tailspikes (gp9) that attach asymmetrically to gp10 insertion domain. Cryo-EM analysis of P22 mutants lacking the ejection proteins gp7 or gp20 and biochemical analysis of purified recombinant proteins suggest that gp7 and gp20 form a molecular complex associated with the tail apparatus via the portal protein barrel. We identified a putative signal transduction pathway from the tailspike to the tail needle, mediated by three flexible loops in the tail hub, that explains how lipopolysaccharide (LPS) is sufficient to trigger the ejection of the P22 DNA in vitro.
History
DepositionAug 18, 2023-
Header (metadata) releaseNov 29, 2023-
Map releaseNov 29, 2023-
UpdateDec 6, 2023-
Current statusDec 6, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41651.png

Downloads & links

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Map

FileDownload / File: emd_41651.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.16582 Å
Density
Contour LevelBy AUTHOR: 3.5
Minimum - Maximum-21.766584000000002 - 40.782803000000001
Average (Standard dev.)-0.000000000000364 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions440440440
Spacing440440440
CellA=B=C: 512.9599 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_41651_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_41651_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_41651_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : Salmonella phage P22

EntireName: Salmonella phage P22 (virus)
Components
  • Virus: Salmonella phage P22 (virus)
    • Protein or peptide: Portal protein
    • Protein or peptide: Peptidoglycan hydrolase gp4

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Supramolecule #1: Salmonella phage P22

SupramoleculeName: Salmonella phage P22 / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / NCBI-ID: 2908168 / Sci species name: Salmonella phage P22 / Virus type: VIRION / Virus isolate: OTHER / Virus enveloped: No / Virus empty: No
Host (natural)Organism: Salmonella enterica (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 phage P22 (virus)
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: Peptidoglycan hydrolase gp4

MacromoleculeName: Peptidoglycan hydrolase gp4 / type: protein_or_peptide / ID: 2 / Number of copies: 12 / Enantiomer: LEVO
Source (natural)Organism: Salmonella phage P22 (virus)
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: Peptidoglycan hydrolase gp4

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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: 7.5
GridModel: Quantifoil R2/1 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 15 sec. / Pretreatment - Atmosphere: OTHER / Pretreatment - Pressure: 0.015 kPa
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Calibrated defocus max: 2.1 µm / Calibrated defocus min: 0.8 µm / Calibrated magnification: 29000 / Illumination mode: OTHER / Imaging mode: OTHER / Cs: 2.7 mm / Nominal defocus max: 2.1 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 29000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Digitization - Dimensions - Width: 11520 pixel / Digitization - Dimensions - Height: 8184 pixel / Average electron dose: 1.08 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1.2)
Final 3D classificationSoftware - Name: RELION (ver. 3.1.2)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1.2)
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C12 (12 fold cyclic) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1.2) / Number images used: 38151
FSC plot (resolution estimation)

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