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Comparative studies of T = 3 and T = 4 icosahedral RNA insect viruses

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Book cover Positive-Strand RNA Viruses

Part of the book series: Archives of Virology Supplementum ((ARCHIVES SUPPL,volume 9))

Summary

Crystallographic and molecular biological studies of T = 3 nodaviruses (180 identical subunits in the particle) and T = 4 tetraviruses (240 identical subunits in the particle) have revealed similarity in both the architecture of the particles and the strategy for maturation. The comparative studies provide a novel opportunity to examine an apparent evolution of particle size, from smaller (T = 3) to larger (T = 4), with both particles based on similar subunits. The BBV and FHV nodavirus structures are refined at 2.8 Å and 3 Å respectively, while the NωV structure is at 6 Å resolution. Nevertheless, the detailed comparisons of the noda and tetravirus X-ray electron density maps show that the same type of switching in subunit twofold contacts is used in the T = 3 and T = 4 capsids, although differences must exist between quasi and icosahedral threefold contacts in the T = 4 particle that have not yet been detected. The analyses of primary and tertiary structures of noda and tetraviruses show that NωV subunits undergo a post assembly cleavage like that observed in nodaviruses and that the cleaved 76 C-terminal residues remain associated with the particle.

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© 1994 Springer-Verlag

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Johnson, J.E. et al. (1994). Comparative studies of T = 3 and T = 4 icosahedral RNA insect viruses. In: Brinton, M.A., Calisher, C.H., Rueckert, R. (eds) Positive-Strand RNA Viruses. Archives of Virology Supplementum, vol 9. Springer, Vienna. https://doi.org/10.1007/978-3-7091-9326-6_48

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  • DOI: https://doi.org/10.1007/978-3-7091-9326-6_48

  • Publisher Name: Springer, Vienna

  • Print ISBN: 978-3-211-82522-8

  • Online ISBN: 978-3-7091-9326-6

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