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J Gen Virol. 1977 Feb;34(2):269-83.

Characterization of the Drosophila C virus.


Some properties of Drosophila C virus (DCV), a non-occluded isometric virus, have been studied. The virus particles were 30 nm in diam., their sedimentation coefficient was 153S and their buoyant density was 1-34 g/ml in caesium chloride in the pH range 7 to 9. These particles contained about 31% ribonucleic acid (RNA) and 69% protein. The reaction of formaldehyde with DCV particles suggested that the RNA in situ is single-stranded. The infectivity of DCV was stable at pH 3. The virus capsid contained three major polypeptides with mol. wt. of 31000, 30000 and 28000, and two minor components of mol. wt. 37000 and 8500. Virus preparations also contained a small number of infective particles 24 nm in diam. banding at a density of 1-44 g/ml. Preliminary results indicated that these heavy particles probably correspond to the dense particles recently reported in several vertebrate picornaviruses. RNA extracted from DCV was single-stranded and infectious. Its mol. wt. was calculated to be approx 3 X 10(6). It is proposed that this virus be included in the enterovirus group. The crytogram of the virus is R/1:3.0/31:S/S:I/O.

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