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TitleCryo-EM structure of flagellotropic bacteriophage Chi.
Journal, issue, pagesStructure, Vol. 32, Issue 7, Page 856-865.e3, Year 2024
Publish dateJul 11, 2024
AuthorsRavi R Sonani / Nathaniel C Esteves / Birgit E Scharf / Edward H Egelman /
PubMed AbstractThe flagellotropic bacteriophage χ (Chi) infects bacteria via the flagellar filament. Despite years of study, its structural architecture remains partly characterized. Through cryo-EM, we unveil ...The flagellotropic bacteriophage χ (Chi) infects bacteria via the flagellar filament. Despite years of study, its structural architecture remains partly characterized. Through cryo-EM, we unveil χ's nearly complete structure, encompassing capsid, neck, tail, and tail tip. While the capsid and tail resemble phage YSD1, the neck and tail tip reveal new proteins and their arrangement. The neck shows a unique conformation of the tail tube protein, forming a socket-like structure for attachment to the neck. The tail tip comprises four proteins, including distal tail protein (DTP), two baseplate hub proteins (BH1P and BH2P), and tail tip assembly protein (TAP) exhibiting minimal organization compared to other siphophages. Deviating from the consensus in other siphophages, DTP in χ forms a trimeric assembly, reducing tail symmetry from 6-fold to 3-fold at the tip. These findings illuminate the previously unexplored structural organization of χ's neck and tail tip.
External linksStructure / PubMed:38614087 / PubMed Central
MethodsEM (single particle) / EM (helical sym.)
Resolution2.7 - 4.2 Å
Structure data

43243

8vhx

EMDB-43243, PDB-8vhx:
Cryo-EM of neck of bacteriophage Chi
Method: EM (single particle) / Resolution: 2.9 Å

43278

8vja

EMDB-43278, PDB-8vja:
Cryo-EM of tail of bacteriophage Chi
Method: EM (helical sym.) / Resolution: 2.7 Å

43281

8vjh

EMDB-43281, PDB-8vjh:
Cryo-EM of tail-tip of bacteriophage Chi
Method: EM (single particle) / Resolution: 4.2 Å

43282

8vji

EMDB-43282, PDB-8vji:
Cryo-EM of capsid of bacteriophage Chi
Method: EM (single particle) / Resolution: 3.3 Å

Chemicals

ChemComp-FE:
Unknown entry

Source
  • chivirus chi
KeywordsVIRUS / Flagellotropic bacteriophage / Siphophage / Neck / Tail / Tail-tip / Capsid

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