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

J. E. Johnson, S. Munshi, L. Liljas, D. Agrawal, N. H. Olson, V. Reddy, A. Fisher, B. McKinney, T. Schmidt, T. S. Baker

Research output: Contribution to journalReview articlepeer-review

20 Scopus citations


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 A and 3 A respectively, while the N omega V structure is at 6 A 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 N omega V subunits undergo a post assembly cleavage like that observed in nodaviruses and that the cleaved 76 C-terminal residues remain associated with the particle.

Original languageEnglish (US)
Pages (from-to)497-512
Number of pages16
JournalArchives of virology. Supplementum
StatePublished - 1994
Externally publishedYes


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