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J Virol. 1990 December; 64(12): 5912-5918

Two DNA polymerases may be required for synthesis of the lagging DNA strand of simian virus 40.

Department of Biochemistry, Tel Aviv University, Ramat Aviv, Israel.

ABSTRACT

Agents discriminating between DNA polymerase alpha and DNA polymerases of class delta (polymerase delta or epsilon) were used to characterize steps in the synthesis of the lagging DNA strand of simian virus 40 during DNA replication in isolated nuclei. The synthesis of lagging-strand intermediates below 40 nucleotides, termed DNA primers (T. Nethanel, S. Reisfeld, G. Dinter-Gottlieb, and G. Kaufmann, J. Virol. 62:2867-2873, 1988), was selectively inhibited by butylphenyl dGTP or by neutralizing DNA polymerase alpha monoclonal antibodies. The synthesis of longer lagging chains of up to 250 nucleotides (Okazaki pieces) was affected to a lesser extent, possibly indirectly, by these agents. Aphidicolin, which inhibits both alpha- and delta-class enzymes, elicited the opposite pattern: DNA primers accumulated in its presence and were not converted into Okazaki pieces. These and previous data suggest that DNA polymerase alpha primase synthesizes DNA primers, whereas another DNA polymerase, presumably DNA polymerase delta or epsilon, mediates the conversion of DNA primers into Okazaki pieces.

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