Abstract
The synthesis of cell-specific ribonucleic acid (RNA) appeared to be stimulated in human embryonic kidney (HEK) cultures infected with adenovirus 2 or 12. Deoxyribonucleic acid (DNA)-RNA hybridization experiments revealed that by 44 to 70 hr after infection with either virus, the relative amount of pulse-labeled RNA capable of hybridizing with HEK cell DNA increased considerably; such RNA was detected in both nuclear and cytoplasmic fractions. The main increase in apparent host RNA synthesis was preceded by (i) a relatively early transient stimulation of the DNA-dependent RNA polymerase activity in isolated nuclei, and (ii) a small but consistently observed increase in the rate of acetylation of lysine-rich and arginine-rich histone fractions. The Mn2+-(NH4)2SO4 and Mg2+-activated RNA polymerase reactions measured in nuclei isolated from cells infected with adenovirus 2 or 12 were stimulated at about the same time; a rapid loss of polymerase activity followed. The augmentation of the two RNA polymerase reactions found in adenovirus 12-infected cells was independent of protein synthesis. After the initial increase, the acetylation rate of histones of cells infected with adenovirus 2 or 12 declined, until late in infection it was approximately 40 to 70% of the control cell rate.
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Selected References
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