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Deoxyribonucleic Acid Polymerase of Rous Sarcoma Virus: Reaction Conditions and Analysis of the Reaction Product Nucleic Acids

Institute of Microbiology, Rutgers University, New Brunswick, New Jersey 08903
The Institute of Cancer Research, Columbia University, New York, New York 10032

ABSTRACT

Reaction conditions for Rous sarcoma virus ribonucleic acid (RNA)-instructed deoxyribonucleic acid (DNA) polymerase activity are described whereby the viral RNA is relatively protected from endogenous or added nuclease activity. Three analyses of reaction product nucleic acids (³H-RNA, ³²P-DNA) were compared, namely, gel electrophoresis, Cs₂SO₄ gradient centrifugation, and hydroxyapatite column chromatography. It was found that hydroxyapatite analysis could be misleading unless the state of the template RNA was monitored concomitantly with the DNA analysis. Gel electrophoresis and Cs₂SO₄ gradient centrifugation gave comparable results. It was concluded that analyses of the product of reverse transcriptase reactions should not only refer to the template RNA and product DNA species, but also be performed with virus or viral RNA which do not have or obtain nicks in the 60S RNA. Otherwise, interpretation of the results would have the ambiguity of potential artifacts caused by those degraded RNA molecules.

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