PS (Y-15) cells, a porcine kidney stable cell line, were infected with Japanese encephalitis virus (JEV), a member of RNA-containing viruses. Immediately after virus adsorption, the cells were treated with chromomycin A
3 in a concentration sufficient to suppress cellular RNA synthesis. The synthesis of viral particles and the production of viral antigen in chromomycin-treated cells were similar to those in non-treated controls in respect to the rate as well as the time course. The results suggest that chromomycin A
3 dose not inhibit RNA synthesis by JEV infection. Eventually, RNA synthesis by JEV infection under the condition in which cellular RNA synthesis was completely suppressed by chromomycin A
3 was demonstrated autoradiographically to occur in the nucleus several hours prior to the production of viral particles.
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