Abstract
Simian sarcoma-associated virus type 1 propagated in human rhabdomyosarcoma cells exhibited characteristics typical of oncornaviruses but seemed to have several aberrant properties. It had a buoyant density of 1.14 g/cm3, had RNA-dependent DNA polymerase activity, seemed to be labile to high salt concentrations, and contained little 50 to 60S RNA but relatively large amounts of human ribosomal RNA. In addition to 50 to 60S RNA, purified virions contained smaller RNA molecules with sedimentation coefficients of 28 to 30S, 18 TO 20S, and 4 to 10S. Unlike the 50 to 60S RNA species, the smaller virion-associated RNAs lacked polyadenylic acid, and the 28 to 30S RNA had an average base composition similar to that of human ribosomal RNA. Upon heat denaturation, the native 50 to 60S RNA genome yielded polyadenylic acid-containing 28 to 30S subunits that degraded in to 18 to 20S molecules upon further heat treatment. The 50 to 60S viral RNA had a guanine plus cytosine content of 56%.
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Selected References
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