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Ribonucleic Acid Synthesis by Isolated Viruses of Penicillium stoloniferum

Department of Genetics, John Innes Institute, Colney Lane, Norwich NOR 70F, England

Purified Penicillium stoloniferum viruses PsV-F and PsV-S both possess virus-associated RNA polymerase activity. The PsV-F polymerase was dependent upon GTP, ATP and magnesium chloride. It was not activated by Triton X-100. No DNA synthesis was observed when deoxyribonucleoside triphosphates were substituted for RNA precursors. The RNA reaction product for both viruses remained associated with the virus in sedimentation and electrophoresis and was resistant to digestion by pancreatic ribonuclease both before and after extraction from the virus. Extracted PsV-F RNA reaction product co-electrophoresed with parental double-stranded RNA.

Received 7 January 1974; accepted 5 April 1974.