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TitleStructural changes in a marine podovirus associated with release of its genome into Prochlorococcus.
Journal, issue, pagesNat Struct Mol Biol, Vol. 17, Issue 7, Page 830-836, Year 2010
Publish dateJun 13, 2010
AuthorsXiangan Liu / Qinfen Zhang / Kazuyoshi Murata / Matthew L Baker / Matthew B Sullivan / Caroline Fu / Matthew T Dougherty / Michael F Schmid / Marcia S Osburne / Sallie W Chisholm / Wah Chiu /
PubMed AbstractPodovirus P-SSP7 infects Prochlorococcus marinus, the most abundant oceanic photosynthetic microorganism. Single-particle cryo-electron microscopy yields icosahedral and asymmetrical structures of ...Podovirus P-SSP7 infects Prochlorococcus marinus, the most abundant oceanic photosynthetic microorganism. Single-particle cryo-electron microscopy yields icosahedral and asymmetrical structures of infectious P-SSP7 with 4.6-A and 9-A resolution, respectively. The asymmetric reconstruction reveals how symmetry mismatches are accommodated among five of the gene products at the portal vertex. Reconstructions of infectious and empty particles show a conformational change of the 'valve' density in the nozzle, an orientation difference in the tail fibers, a disordering of the C terminus of the portal protein and the disappearance of the core proteins. In addition, cryo-electron tomography of P-SSP7 infecting Prochlorococcus showed the same tail-fiber conformation as that in empty particles. Our observations suggest a mechanism whereby, upon binding to the host cell, the tail fibers induce a cascade of structural alterations of the portal vertex complex that triggers DNA release.
External linksNat Struct Mol Biol / PubMed:20543830 / PubMed Central
MethodsEM (subtomogram averaging) / EM (single particle)
Resolution4.6 - 24.0 Å
Structure data

EMDB-1707:
Structural Changes in a Marine Podovirus Associated with Viral Genome Release into Prochlorococcus
Method: EM (subtomogram averaging)

1713

2xd8

EMDB-1713, PDB-2xd8:
Capsid structure of the infectious Prochlorococcus Cyanophage P-SSP7
Method: EM (single particle) / Resolution: 4.6 Å

EMDB-1714:
Asymmetric structure of the empty Prochlorococcus Cyanophage P-SSP7
Method: EM (single particle) / Resolution: 24.0 Å

EMDB-1715:
Asymmetric structure of the infectious Prochlorococcus Cyanophage P-SSP7
Method: EM (single particle) / Resolution: 9.2 Å

Source
  • prochlorococcus phage p-ssp7 (virus)
KeywordsVIRUS / MARINE PODOVIRUS / T7-LIKE VIRUS

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