Abstract
Bombyx mori cytoplasmic polyhedrosis virus (BmCPV) polyhedrin gene from natural mutant strain B, B2 and P was cloned and the amino acid sequence was compared with that of wild-type virus (strain H). Chimeric polyhedrin genes (8 types) containing only one site of mutation within the amino acid sequence were also constructed. Fifteen types of polyhedrin genes were introduced into a baculovirus expression vector and hexahedral, acicular, pyramidal, or amorphous polyhedra were formed in infected cells. These results demonstrated that the shape of polyhedra as well as the crystallization pattern of the polyhedrin could be changed by mutations at respectively N-terminal and C-terminal regions of BmCPV polyhedrin gene.
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