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The L3 and M7 genes of bluetongue virus (BTV), which encode the two major core proteins of the virus (VP3 and VP7, respectively), were inserted into a baculovirus dual-expression transfer vector and a recombinant baculovirus expressing both foreign genes isolated following in vivo recombination with wild-type Autographa californica nuclear polyhedrosis virus DNA. Spodoptera frugiperda insect cells infected with the recombinant synthesized large amounts of BTV corelike particles. These particles have been shown to be similar to authentic BTV cores in terms of size, appearance, stoichiometric arrangement of VP3 to VP7 (ratio, 2:15), and the predominance of VP7 on the surface of the particles. In infected insect cells, the corelike particles were observed in paracrystalline arrays. The formation of these structures indicates that neither the BTV double-stranded viral RNA species nor the associated minor core proteins are necessary for assembly of cores in insect cells. Furthermore, the three BTV nonstructural proteins NS1, NS2, and NS3, are not required to assist or direct the formation of empty corelike particles from VP3 and VP7.

Synthesis of bluetongue virus (BTV) corelike particles by a recombinant baculovirus expressing the two major structural core proteins of BTV