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- PDB-7bou: GP8 of Mature Bacteriophage T7 -

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Database: PDB / ID: 7bou
TitleGP8 of Mature Bacteriophage T7
ComponentsPortal protein
KeywordsSTRUCTURAL PROTEIN / Portal / Bacteriophage / Mature / Transport
Function / homologyHead-to-tail connector protein, podovirus-type / Portal protein, Caudovirales / Bacteriophage head to tail connecting protein / viral portal complex / viral genome ejection through host cell envelope, short tail mechanism / viral DNA genome packaging / Portal protein
Function and homology information
Biological speciesEscherichia phage T7 (bacteriophage)
MethodELECTRON MICROSCOPY / single particle reconstruction / Resolution: 3.6 Å
AuthorsChen, W.Y. / Xiao, H.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31971122 China
National Natural Science Foundation of China (NSFC)31570742 China
CitationJournal: Protein Cell / Year: 2020
Title: Structural changes of a bacteriophage upon DNA packaging and maturation.
Authors: Wenyuan Chen / Hao Xiao / Xurong Wang / Shuanglin Song / Zhen Han / Xiaowu Li / Fan Yang / Li Wang / Jingdong Song / Hongrong Liu / Lingpeng Cheng /
DepositionMar 19, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 17, 2021Provider: repository / Type: Initial release

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Deposited unit
A: Portal protein
B: Portal protein
C: Portal protein
D: Portal protein
E: Portal protein
F: Portal protein
G: Portal protein
H: Portal protein
I: Portal protein
J: Portal protein
K: Portal protein
L: Portal protein

Theoretical massNumber of molelcules
Total (without water)710,08812

  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area136620 Å2
ΔGint-709 kcal/mol
Surface area245400 Å2


#1: Protein
Portal protein / Gene product 8 / Gp8 / Head-to-tail connector

Mass: 59173.984 Da / Num. of mol.: 12
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia phage T7 (bacteriophage) / Production host: Escherichia coli BL21 (bacteria) / Strain (production host): BL21 / References: UniProt: P03728

Experimental details


EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

Sample preparation

ComponentName: Mature GP8 / Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Source (natural)Organism: Escherichia phage T7 (bacteriophage)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: NO

Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / C2 aperture diameter: 70 µm
Image recordingElectron dose: 24 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k)


3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 50000 / Symmetry type: POINT

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