Infectious Bursal Disease Virus Structural Protein VP2 Expressed by a Baculovirus Recombinant in Bombyx mori

VP2 cDNA gene of the infectious bursal disease virus HZ96 strain, encoding a major host-protective antigen, was cloned into baculovirus transfer vector pBacPAK8, resulting in a recombinant transfer vector pBacPAK-VP2. The vector pBacPAK-VP2 and linearized DNA of modified baculovirus Bm-BacPAK6 were co-transfected into the cultured Bombyx mori (Bm) N cells, in which homologous recombination occurred. Then, baculovirus recombinants were screened out. The Bm cells and Bm larvae were infected with the baculovirus recombinant that can expresse VP2, and Bm N cells and haemolymph of Bm larvae were collected for assays. The results of ELISA and Western immunoblotting assays demonstrated that VP2 was expressed in the cultured Bm cells and the Bm larvae.