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Bluetongue is a disease of ruminants. The etiologic agent is bluetongue virus (BTV), a gnat-transmitted member of the Orbivirus genus of the Reoviridae. The virus has a genome of 10 double-stranded RNA species L1 to L3, M4 to M6, S7 to S10). The L2 and M5 genes of BTV which encode the outer capsid proteins VP2 and VP5, respectively, were inserted into a recombinant baculovirus downstream of duplicated copies of the baculovirus polyhedrin promoter. Insect cells coinfected with this virus plus a recombinant baculovirus expressing the two major core proteins VP3 and VP7 of BTV (T.J. French and P. Roy, J. Virol. 64:1530-1536, 1990) synthesized noninfectious, double-shelled, viruslike particles. When purified, these particles were found to have the same size and appearance as authentic BTV virions and exhibited high levels of hemagglutination activity. Antibodies raised to the expressed particles contained high titers of neutralizing activity against the homologous BTV serotype. The assembly of these bluetongue viruslike particles after the simultaneous expression of four separate proteins is indicative of the potential of this technology for the production of a new generation of viral vaccines and for the study of complex, multiprotein structures.

Assembly of double-shelled, viruslike particles of bluetongue virus by the simultaneous expression of four structural proteins