Abstract

Preparations of Sendai virus purified from infected allantoic fluid catalysed the incorporation of3H- or32P-labelled ribonucleoside triphosphates into an acid-insoluble product during incubation in an RNA polymerase reaction mixture containing the nonionic detergent Nonidet P-40. The requirements for the enzyme were established, and the product was shown to be ribonucleic acid. Comparison of the RNA synthesised by the enzyme with UNA formed in infected cells during inhibition of virus-induced protein synthesis by cycloheximide suggests that the virion enzyme is involved in early virus-specific RNA synthesis in infected cells.

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