Abstract:
: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.
journal_name
Nat Struct Mol Bioljournal_title
Nature structural & molecular biologyauthors
Liu X,Zhang Q,Murata K,Baker ML,Sullivan MB,Fu C,Dougherty MT,Schmid MF,Osburne MS,Chisholm SW,Chiu Wdoi
10.1038/nsmb.1823subject
Has Abstractpub_date
2010-07-01 00:00:00pages
830-6issue
7eissn
1545-9993issn
1545-9985pii
nsmb.1823journal_volume
17pub_type
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