Download MendeleyAtomic structure reveals the unique capsid organization of a dsRNA virus.
Pan, J., Dong, L., Lin, L., Ochoa, W.F., Sinkovits, R.S., Havens, W.M., Nibert, M.L., Baker, T.S., Ghabrial, S.A., Tao, Y.J.(2009) Proc Natl Acad Sci U S A 106: 4225-4230
- PubMed: 19246376
- DOI: https://doi.org/10.1073/pnas.0812071106
- Primary Citation of Related Structures:
3ES5 - PubMed Abstract:
For most dsRNA viruses, the genome-enclosing capsid comprises 120 copies of a single capsid protein (CP) organized into 60 icosahedrally equivalent dimers, generally identified as 2 nonsymmetricallyinteracting CP molecules with extensive lateral contacts. The crystal structure of a partitivirus, Penicillium stoloniferum virus F (PsV-F), reveals a different organization, in which the CP dimer is related by almost-perfect local 2-fold symmetry, forms prominent surface arches, and includes extensive structure swapping between the 2 subunits. An electron cryomicroscopy map of PsV-F shows that the disordered N terminus of each CP molecule interacts with the dsRNA genome and probably participates in its packaging or transcription. Intact PsV-F particles mediate semiconservative transcription, and transcripts are likely to exit through negatively charged channels at the icosahedral 5-fold axes. Other findings suggest that the PsV-F capsid is assembled from dimers of CP dimers, with an arrangement similar to flavivirus E glycoproteins.
Organizational Affiliation:
Department of Biochemistry and Cell Biology, Rice University, Houston, TX 77005, USA.
