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TitleThree-dimensional structure and function of the Paramecium bursaria chlorella virus capsid.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 108, Issue 36, Page 14837-14842, Year 2011
Publish dateSep 6, 2011
AuthorsXinzheng Zhang / Ye Xiang / David D Dunigan / Thomas Klose / Paul R Chipman / James L Van Etten / Michael G Rossmann /
PubMed AbstractA cryoelectron microscopy 8.5 Å resolution map of the 1,900 Å diameter, icosahedral, internally enveloped Paramecium bursaria chlorella virus was used to interpret structures of the virus at ...A cryoelectron microscopy 8.5 Å resolution map of the 1,900 Å diameter, icosahedral, internally enveloped Paramecium bursaria chlorella virus was used to interpret structures of the virus at initial stages of cell infection. A fivefold averaged map demonstrated that two minor capsid proteins involved in stabilizing the capsid are missing in the vicinity of the unique vertex. Reconstruction of the virus in the presence of host chlorella cell walls established that the spike at the unique vertex initiates binding to the cell wall, which results in the enveloped nucleocapsid moving closer to the cell. This process is concurrent with the release of the internal viral membrane that was linked to the capsid by many copies of a viral membrane protein in the mature infectous virus. Simultaneously, part of the trisymmetrons around the unique vertex disassemble, probably in part because two minor capsid proteins are absent, causing Paramecium bursaria chlorella virus and the cellular contents to merge, possibly as a result of enzyme(s) within the spike assembly. This may be one of only a few recordings of successive stages of a virus while infecting a eukaryotic host in pseudoatomic detail in three dimensions.
External linksProc Natl Acad Sci U S A / PubMed:21873222 / PubMed Central
MethodsEM (single particle)
Resolution9.8 Å
Structure data

EMDB-5378:
The structure of PBCV-1 (icosahedrally averaged map)
Method: EM (single particle) / Resolution: 9.8 Å

EMDB-5384:
The structure of PBCV-1 (five-fold averaged map)
Method: EM (single particle) / Resolution: 9.8 Å

EMDB-5385:
The structure of PBCV-1 (local symmetry averaged map of major capsid protein)
Method: EM (single particle) / Resolution: 9.8 Å

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