Abstract
S-adenosyl-L-methionine (SAM) activated the virus-associated RNA polymerase of cytoplasmic polyhedrosis virus in vitro. Synthesis of single-stranded viral RNA (mRNA) proceeded depending on the presence of SAM.A methyl residue of SAM was incorporated into an RNA molecule. A ribose moiety of adenylic acid in the 5'-terminal region of the nascent RNA was methylated in the very early stage of the transcription. The dependence of the viral transcription on the presence of SAM and the methylation of terminal nucleotide suggests that the transcription of CPV is a "methylation-coupled" reaction.
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