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Structure paper

TitleInsights into the structure and initial host attachment of the flagellotropic bacteriophage 7-7-1.
Journal, issue, pagesCommun Biol, Vol. 9, Issue 1, Page 55, Year 2025
Publish dateDec 6, 2025
AuthorsW E M Noteborn / R Ouyang / T Hoeksma / A Sidi Mabrouk / N C Esteves / D M Pelt / B E Scharf / A Briegel /
PubMed AbstractUnderstanding the structural and functional mechanisms of bacteriophage 7-7-1, the flagellotropic phage infecting Agrobacterium sp. H13-3, offers promising insights into phage-host interactions. ...Understanding the structural and functional mechanisms of bacteriophage 7-7-1, the flagellotropic phage infecting Agrobacterium sp. H13-3, offers promising insights into phage-host interactions. Using single particle analysis (SPA) cryo-electron microscopy (cryo-EM), we determined the capsid, neck region, tail, and baseplate complex structures. Combined with cryo-electron tomography (cryo-ET) and machine learning methodologies, our findings indicate that phage 7-7-1 uses capsid fibers to establish initial contact with the host flagellum, followed by subsequent attachment to cell surface receptors. The study also demonstrated that capsid fibers are flexible and can interact with other phages and host flagella, suggesting a cooperative infection strategy. These results provide crucial structural insights and may open avenues for developing phage-based therapeutics against resistant bacterial pathogens.
External linksCommun Biol / PubMed:41353512 / PubMed Central
MethodsEM (single particle) / EM (tomography)
Resolution3.03 - 3.56 Å
Structure data

52521

9hz7

EMDB-52521, PDB-9hz7:
Agrobacterium phage 7-7-1 tail
Method: EM (single particle) / Resolution: 3.03 Å

52522

9hz8

EMDB-52522, PDB-9hz8:
Agrobacterium phage 7-7-1 capsid
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-53352: Cryo-tomogram of Agrobacterium phage 7-7-1 and Agrobacterium sp. H13-3
Method: EM (tomography)

54017

9rkq

EMDB-54017, PDB-9rkq:
Agrobacterium phage 7-7-1 portal
Method: EM (single particle) / Resolution: 3.21 Å

54018

9rkr

EMDB-54018, PDB-9rkr:
Agrobacterium phage 7-7-1 neck 1
Method: EM (single particle) / Resolution: 3.53 Å

54019

9rks

EMDB-54019, PDB-9rks:
Agrobacterium phage 7-7-1 neck 2 + tail terminator + tail sheath + tail tube
Method: EM (single particle) / Resolution: 3.56 Å

54020

9rkt

EMDB-54020, PDB-9rkt:
Agrobacterium phage 7-7-1 collar
Method: EM (single particle) / Resolution: 3.31 Å

54021

9rku

EMDB-54021, PDB-9rku:
Agrobacterium phage 7-7-1 baseplate
Method: EM (single particle) / Resolution: 3.44 Å

54022

9rkv

EMDB-54022: Agrobacterium phage 7-7-1 tail spike
PDB-9rkv: Agrobacterium phage 7-7-1 tail fibers
Method: EM (single particle) / Resolution: 3.52 Å

Source
  • agrobacterium phage 7-7-1 (virus)
KeywordsVIRUS / Flagella phage / Agrobacterium sp. H13-3 / Tail / VIRAL PROTEIN / Capsid / Tail spike / Neck 1 / neck 2 + tail terminator + sheath + tail / Collar / Baseplate

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