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- EMDB-31315: Symmety-mismatch Reconstruction of Mature T7 -

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Basic information

Entry
Database: EMDB / ID: EMD-31315
TitleSymmety-mismatch Reconstruction of Mature T7
Map dataMature T7
Sample
  • Virus: Escherichia phage T7 (virus)
Function / homology
Function and homology information


virus tail, tube / viral portal complex / symbiont genome ejection through host cell envelope, short tail mechanism / virus tail, fiber / viral DNA genome packaging / adhesion receptor-mediated virion attachment to host cell / symbiont entry into host cell / virion attachment to host cell / identical protein binding
Similarity search - Function
: / Tail fibre protein gp37 trimerization region / Bacteriophage T7, Gp17, C-terminal / Tail fibre protein gp37 C terminal domain / Tail tubular protein Gp11 / Tail tubular protein / Bacteriophage T7 tail fibre protein / Phage T7 tail fibre protein / Portal protein, Caudovirales / Head-to-tail connector protein, podovirus-type / Bacteriophage head to tail connecting protein
Similarity search - Domain/homology
Portal protein / Tail tubular protein gp11 / Tail tubular protein gp12 / Tail fiber protein
Similarity search - Component
Biological speciesEscherichia phage T7 (virus)
Methodsingle particle reconstruction / cryo EM / Resolution: 7.0 Å
AuthorsLiu HR / Chen WY
Funding support China, 3 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)12034006 China
National Natural Science Foundation of China (NSFC)31971122 China
National Natural Science Foundation of China (NSFC)32071209 China
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Structural changes in bacteriophage T7 upon receptor-induced genome ejection.
Authors: Wenyuan Chen / Hao Xiao / Li Wang / Xurong Wang / Zhixue Tan / Zhen Han / Xiaowu Li / Fan Yang / Zhonghua Liu / Jingdong Song / Hongrong Liu / Lingpeng Cheng /
Abstract: Many tailed bacteriophages assemble ejection proteins and a portal-tail complex at a unique vertex of the capsid. The ejection proteins form a transenvelope channel extending the portal-tail channel ...Many tailed bacteriophages assemble ejection proteins and a portal-tail complex at a unique vertex of the capsid. The ejection proteins form a transenvelope channel extending the portal-tail channel for the delivery of genomic DNA in cell infection. Here, we report the structure of the mature bacteriophage T7, including the ejection proteins, as well as the structures of the full and empty T7 particles in complex with their cell receptor lipopolysaccharide. Our near-atomic-resolution reconstruction shows that the ejection proteins in the mature T7 assemble into a core, which comprises a fourfold gene product 16 (gp16) ring, an eightfold gp15 ring, and a putative eightfold gp14 ring. The gp15 and gp16 are mainly composed of helix bundles, and gp16 harbors a lytic transglycosylase domain for degrading the bacterial peptidoglycan layer. When interacting with the lipopolysaccharide, the T7 tail nozzle opens. Six copies of gp14 anchor to the tail nozzle, extending the nozzle across the lipopolysaccharide lipid bilayer. The structures of gp15 and gp16 in the mature T7 suggest that they should undergo remarkable conformational changes to form the transenvelope channel. Hydrophobic α-helices were observed in gp16 but not in gp15, suggesting that gp15 forms the channel in the hydrophilic periplasm and gp16 forms the channel in the cytoplasmic membrane.
History
DepositionMay 17, 2021-
Header (metadata) releaseSep 22, 2021-
Map releaseSep 22, 2021-
UpdateSep 22, 2021-
Current statusSep 22, 2021Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 6
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 6
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_31315.png

Downloads & links

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Map

FileDownload / File: emd_31315.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMature T7
Voxel sizeX=Y=Z: 2.54 Å
Density
Contour LevelBy AUTHOR: 6.0 / Movie #1: 6
Minimum - Maximum-17.631266 - 30.60905
Average (Standard dev.)-0.09466071 (±2.4837337)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-202-202-202
Dimensions512512512
Spacing512512512
CellA=B=C: 1300.48 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.542.542.54
M x/y/z512512512
origin x/y/z0.0000.0000.000
length x/y/z1300.4801300.4801300.480
α/β/γ90.00090.00090.000
start NX/NY/NZ-140-140-140
NX/NY/NZ280280280
MAP C/R/S123
start NC/NR/NS-202-202-202
NC/NR/NS512512512
D min/max/mean-17.63130.609-0.095

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Supplemental data

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Sample components

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Entire : Escherichia phage T7

EntireName: Escherichia phage T7 (virus)
Components
  • Virus: Escherichia phage T7 (virus)

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Supramolecule #1: Escherichia phage T7

SupramoleculeName: Escherichia phage T7 / type: virus / ID: 1 / Parent: 0 / NCBI-ID: 10760 / Sci species name: Escherichia phage T7 / Virus type: VIRION / Virus isolate: SPECIES / 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: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TECNAI ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Average electron dose: 25.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: COMMON LINE
Final angle assignmentType: PROJECTION MATCHING
Final reconstructionResolution.type: BY AUTHOR / Resolution: 7.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 75213

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