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. 1968 Oct;2(10):1211–1222. doi: 10.1128/jvi.2.10.1211-1222.1968

Double-stranded Ribonucleic Acid from Cytoplasmic Polyhedrosis Virus of the Silkworm

K Miura 1, I Fujii 1, T Sakaki 1, M Fuke 1, S Kawase 1
PMCID: PMC375454  PMID: 16789087

Abstract

Ribonucleic acid (RNA) was extracted by phenol treatment from cytoplasmic polyhedrosis virus isolated from the midgut of infected silkworms. This RNA appears as threads when precipitated in alcohol. Two components having different sedimentation constants were observed. The molecular weight of the RNA preparation obtained by sedimentation coefficient (weight-averaged) and intrinsic viscosity was about 2 × 106 to 3 × 106. It was one-half to one-third the size of the calculated molecular weight for an entire RNA molecule in a virion. Electron micrographs of this RNA preparation showed two peaks in the distribution of contour length, at 0.4 and 1.3 μm, which would correspond to molecular weights of 106 and 3 × 106, respectively. The extracted RNA seemed to split into segments at a preferential breaking point. This RNA was soluble in concentrated salt solution, differing from single stranded high-molecular-weight RNA. The base composition of this RNA was complementary in the ratios of adenosine to uridine and guanosine to cytosine. It contained 43% guanosine plus cytosine. Based on its filamentous appearance by electron microscopy, typical pattern of optical rotatory dispersion and circular dichroism, sharp transition of the optical properties on heating, great hyperchromicity on degradation, nonreactivity with formaldehyde, and resistance to ribonucleases, it is concluded that this RNA is double-stranded and has regular base pairings of guanosine-cytosine and adenosine-uridine.

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