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Isolated nuclei from adenovirus type 2-infected HeLa cells catalyze the incorporation of all four deoxyribonucleoside triphosphates into viral DNA. The observed DNA synthesis occurs via a transient formation of DNA fragments with a sedimentation coefficient of 10S. The fragments are precursors to unit-length viral DNA, they are self-complementary to an extent of at least 70%, and they are distributed along most of the viral chromosome. In addition, accumulation of 10S DNA fragments is observed either in intact, virus-infected HeLa cells under conditions where viral DNA synthesis is inhibited by hydroxyurea or in isolated nuclei from virus-infected HeLa cells at low concentrations of deoxyribonucleotides. Under these suboptimal conditions for DNA synthesis in isolated nuclei, ribonucleoside triphosphates determine the size distribution of DNA intermediates. The evidence presented suggests that a ribonucleoside-dependent initiation step as well at two DNA polymerase catalyzed reactions are involved in the discontinuous replication of adenovirus type 2 DNA.

Adenovirus type 2 DNA replication. I. Evidence for discontinuous DNA synthesis