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. 1968 Feb;2(2):89–98. doi: 10.1128/jvi.2.2.89-98.1968

Enhanced Deoxyribonucleic Acid Polymerase Activity in Human Embryonic Kidney Cultures Infected with Adenovirus 2 or 12

Nada Ledinko 1,1
PMCID: PMC375585  PMID: 5742041

Abstract

Deoxyribonucleic acid (DNA) polymerase activity was induced at approximately 18 to 20 hr after infection of secondary cultures of human embryonic kidney cells with adenovirus type 2 or type 12, and, at 30 to 50 hr after infection, the activity of this enzyme increased two- to threefold. The activity of thymidine kinase was also induced, but the activity of deoxycytidylic deaminase was not. The DNA content per cell at 71 hr after infection was 1.6-fold greater in adenovirus 2-infected cultures, and approximately 2.4-fold greater in adenovirus 12-infected cultures, than in the noninfected cultures. Several properties of DNA polymerase were studied. The enzymes in normal and adenovirus 2- or 12-infected cell extracts were saturated by approximately the same concentration of heat-denatured salmon sperm DNA primer (160 μg/ml); the enzyme activities had a similar broad pH optimum between 7.5 and 9. Extracts prepared from cells infected by either adenovirus did not activate DNA polymerase from noninfected cells, nor did the noninfected cell extracts inhibit enzyme activity of infected cell extracts. DNA polymerase in both normal and adenovirus 2- or 12-infected cells was located predominantly in the nucleus. In each case, the cytoplasm had only 30% of the enzyme activity of the nucleus. At 40 hr after infection with adenovirus 2 or 12, the activities of the enzyme in the nuclear and cytoplasmic fractions increased two- to threefold. Puromycin, an inhibitor of protein synthesis, prevented DNA polymerase induction when added to cultures during the 18- to 30-hr postinfection period, and it arrested the additional increase in enzyme activity when added after enzyme induction began. However, the increases in both DNA polymerase and thymidine kinase activities took place after treatment of infected cultures with 1-β-d-arabinofuranosylcytosine, an inhibitor of DNA synthesis and adenovirus growth.

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Selected References

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