Biochemical Properties of Polyhedra and Virus Particles of the Cytoplasmic Polyhedrosis Virus of Bombyx mori

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Abstract
The structural polypeptides of polyhedra and virus particles of the cytoplasmic polyhedrosis virus (CPV) of Bombyx mori L. were examined by PAGE. Five proteins were observed in polyhedra. The major polypeptide or ‘polyhedral protein’ had a molecular weight of 27,100 daltons and contained a covalently attached carbohydrate moiety. Virus particles extracted from polyhedra (‘occluded’ virions) had a density of 1.43–1.48 g/cm3 in CsCl, and contained five structural polypeptides. After prolonged storage at –20°, a further polypeptide was resolved. ‘Non-occluded’ virus particles had the same density, RNA components and structural proteins as ‘occluded’ virions.

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