Abstract
The DNA ligase activity has been studied in 5-iodo-2'-deoxyuridine (IUdR), mitomycin C (MMC) and IUdR + MMC-treated SV40-infected or mock-infected CV1C11 monkey kidney cells. The results have shown that : 1. The level of enzyme activity is about two or three times higher in IUdR or MMC-treated non-infected cells; 2. SV40 infection doubles the level of ligase activity in the untreated cells; 3. There is an additional increase of ligase activity in IUdR or MMC-treated SV40-infected cells; 4. When infected or mock-infected cells are treated with IUdR + MMC, there is no modification of the results obtained with each drug alone; 5. Two peaks of different S values are detected in a partial purification of the drug(s) or viral induced enzyme(s). The increase in the ligase activity in drug-treated cells is independent of semi-conservative DNA synthesis. The drug(s) and viral-induced enzyme(s) is the consequence of a "de novo" synthesis of proteins, as shown by cycloheximide treatment.
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