Abstract
HEp-2 cells were pulse-labeled at different times after infection with herpes simplex virus, and nuclear ribonucleic acid (RNA) and cytoplasmic RNA were examined. The data showed the following: (i) Analysis by acrylamide gel electrophoresis of cytoplasmic RNA of cells infected at high multiplicities [80 to 200 plaque-forming units (PFU)/cell] revealed that ribosomal RNA (rRNA) synthesis falls to less than 10% of control (uninfected cell) values by 5 hr after infection. The synthesis of 4S RNA also declined but not as rapidly, and at its lowest level it was still 20% of control values. At lower multiplicities (20 PFU), the rate of inhibition was slower than at high multiplicities. However, at all multiplicities the rates of inhibition of 18S and 28S rRNA remained identical and higher than that of 4S RNA. (ii) Analysis of nuclear RNA of cells infected at high multiplicities by sucrose density gradient centrifugation showed that the synthesis and methylation of 45S rRNA precursor continued at a reduced but significant rate (ca. 30% of control values) at times after infection when no radioactive uridine was incorporated or could be chased into 28S and 18S rRNA. This indicates that the inhibition of rRNA synthesis after herpesvirus infection is a result of two processes: a decrease in the rate of synthesis of 45S RNA and a decrease in the rate of processing of that 45S RNA that is synthesized. (iii) Hybridization of nuclear and cytoplasmic RNA of infected cells with herpesvirus DNA revealed that a significant proportion of the total viral RNA in the nucleus has a sedimentation coefficient of 50S or greater. The sedimentation coefficient of virus-specific RNA associated with cytoplasmic polyribosomes is smaller with a maximum at 16S to 20S, but there is some rapidly sedimenting RNA (> 28S) here too. (iv) Finally, there was leakage of low-molecular weight (4S) RNA from infected cells, the leakage being approximately three-fold that of uninfected cells by approximately 5 hr after infection.
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