Effects of actinomycin D and ultraviolet and ionizing radiation on Pichinde virus

M. F. Carter, F. A. Murphy, J. P. Brunschwig, C. Noonan, W. E. Rawls

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9 Scopus citations


Actinomycin D (0.05 μg/ml) suppresses the synthesis of ribosomal RNA of baby hamster kidney (BHK21) cells. The production of infectious Pichinde virus was enhanced in the presence of actinomycin D, although the production of virus particles was not substantially different from cultures inoculated in the absence of the drug. By prelabeling BHK21 cells with 3H-uridine and then allowing the virus to replicate in the presence of actinomycin D, it was possible to show that ribosomal RNA synthesized prior to infection was incorporated into the virion. A single hit kinetics of inactivation of Pichinde virus was observed with ultraviolet light, suggesting that the virus contains only a single copy of genome per virion. Comparison of the inactivation kinetics by gamma irradiation of Pichinde virus with Sindbis and rubella virus indicated that the radiosensitive genome of Pichinde virus was about 6 x 10 6 to 8 x 10 6 daltons. This value is greater than the 3.2 x 10 6 daltons which was estimated by biochemical analysis. One possible explanation considered is that the ribosomal RNA of host cell origin is functional and accounts for the differences in genome size estimated by the two methods.

Original languageEnglish (US)
Pages (from-to)33-38
Number of pages6
JournalJournal of Virology
Issue number1
StatePublished - 1973


ASJC Scopus subject areas

  • Immunology

Cite this

Carter, M. F., Murphy, F. A., Brunschwig, J. P., Noonan, C., & Rawls, W. E. (1973). Effects of actinomycin D and ultraviolet and ionizing radiation on Pichinde virus. Journal of Virology, 12(1), 33-38.