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Simian virus 40 DNA replication has been studied in nuclear monolayers prepared by treatment of monolayers of BSC-1 monkey kidney cells with Nonidet P-40. These nuclear monolayers incorporated [3H]TTP into two types of viral replicative intermediates that sediment as 25-26S and 22-23S species, respectively, in neutral sucrose gradients. The 22-23S species behaves, in dye buoyant density equilibrium gradients, as a late replicative intermediate. Examination of both species in alkaline sucrose gradients revealed the presence of two types of newly synthesized strands: (i) 4-7S strands and (ii) full-length, or nearly full-length, 10-16S strands. At low TTP concentrations (less than 0.5 muM), the two size classes were found in approximately equal amounts. However, at 10 to 50 muM TTP, the proportion of the longer strands increased, with a corresponding decrease in the relative amount of the 4-7S species. Thus, the joining of small, Okazaki-like fragments to the growing chain appears to require a much higher concentration of TTP than the synthesis of the fragments themselves. Replicating simian virus 40 DNA synthesized in the nuclear monolayers is is associated with "M bands", as previously demonstrated for replicating simian virus 40 DNA in cultured whole cells.

Simian virus 40 DNA replication in nuclear monolayers