Abstract
Replicating transforming functions of Rauscher leukemia virus (RLV) and the RLV pseudotype of Moloney sarcoma virus in mouse embryo fibroblasts were found to be most sensitive to inhibition by cytosine arabinoside (ara-C) 30 to 90 min after infection. The initiation of intracellular RLV DNA synthesis was detected by nucleic acid hybridization within this time interval. Treatment of infected cells with cytosine arabinoside abolished RLV DNA synthesis. Peak synthesis of the DNA complementary to the infecting RLV genome, the (-) strand, occurred 40 to 60 min after infection. During this interval two s two species of DNA were observed with estimated molecular weights of 0.5 X 10(5) to 1.0 X 10(5) and 3 X 10(6). Peak synthesis of the (+) strand viral DNA occurred 50 to 70 min after infection. The initial species detected had a molecular weight of 1.5 X 10(5) to 4.0 X 10(5) which shifted as a function of time to 3 X 10(6). Both (+) strand species were initially detected in the cytoplasm followed by a rapid (10-min interval) appearance of the faster-sedimenting species in the nucleus. The virus-specific (-) and (+) strand DNA species are presumably unintegrated intermediates in provirus formation.
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