Properties of a filamentous virus of the honey bee (Apis mellifera)

An ellipsoidal particle, measuring 450 × 150 nm, from honey bees comprises a nucleocapsid measuring 3000 × 40 nm, containing double-stranded DNA with a molecular weight of approximately 12 × 106, which is coiled within a membrane. The buoyant densities in CsCl of the whole particle, nucleocapsid, DNA and DNA with ethidium bromide are 1.28, 1.36, 1.71 and 1.61 g/ml, respectively. The particle contains about 12 proteins, with molecular weights ranging from 13,000 to 70,000, which are distributed approximately equally between the membrane and the nucleocapsid.