Abstract
The effect of UV-irradiation on the conversion of the single-stranded DNA of the parvovirus Minute-Virus-of-Mice (MVM) to duplex Replicative Forms (RF) was studied after infection of mouse A9 fibroblasts. UV-irradiation of the virus prior to infection of unirradiated cells resulted in a dose-dependent, single-hit, inhibition of RF formation. Restriction fragment analysis indicated that this inhibition could be ascribed to the introduction of absolute blocks which prevent elongation of the newly synthesized complementary strand. Cell exposure to UV-light prior to infection with UV-irradiated MVM enhanced the fraction of input viral DNA which was converted to RF. This enhancement required de novo protein synthesis during the interval between cell irradiation and virus infection. These results suggest that DNA replication constitutes a target in the viral life cycle that leads to the UV-enhanced Reactivation of virus survival, however, they do not permit us to identify the step of RF formation which is enhanced in UV-pretreated cells.
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