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J Virol. 1979 January; 29(1): 275-284

Control of herpes simplex virus type 1 mRNA synthesis in cells infected with wild-type virus or the temperature-sensitive mutant tsK.

C M Preston

ABSTRACT

This paper deals with control of mRNA levels, assayed by in vitro translation, in cells infected with herpes simplex virus type 1 (HSV-1). A particularly useful marker has been pyrimidine deoxyribonucleoside kinase (dPyK) mRNA, for which the enzymatically active product can be assayed quantitatively. Cells infected with the HSV-1 temperature-sensitive mutant tsK at the nonpermissive temperature (38.5 degrees C) or with wild-type HSV-1 in the continuous presence of cycloheximide contained no detectable dPyK mRNA. Upon temperature shift-down of tsK-infected cells to 31 degrees C, dPyK mRNA was produced, and this event was inhibited by actinomycin D but not cycloheximide. This result demonstrated that the defective polypeptide in tsK-infected cells was involved in transcription of the dPyK gene and could regain activity at 31 degrees C. Because tsK-infected cells synthesized mainly immediate early polypeptides at 38.5 degrees C, the involvement of this polypeptide class in synthesis of dPyK mRNA was investigated. Analysis of the kinetics of inductions of dPyK mRNA indicated that the temperature-sensitive lesion in tsK lies in an immediate early polypeptide which is directly responsible for activation of the dPyK gene at the transcriptional level.


J Virol. 1979 January; 29(1): 275-284




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