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DNA Polymerase Requirements for Parvovirus H-1 DNA Replication in Vitro

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Journal J Virol
Date 1982 Mar 1
PMID 6808155
Citations 12
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Abstract

An in vitro system using nuclei from parvovirus H-1-infected cells was used to characterize the influence of inhibitors of mammalian DNA polymerases on viral DNA synthesis. The experiments tested the effects of aphidicolin, which is highly specific for DNA polymerase alpha, and 2',3'-dideoxythymidine-5'-triphosphate (ddTTP), which inhibits cellular DNA polymerases in the order gamma greater than beta greater than alpha. Both aphidicolin and ddTTP were inhibitory, indicating that both polymerase alpha and a ddttp-sensitive enzyme are required for viral DNA synthesis. This was seen more clearly in kinetic measurements, which indicated an initial period of rapid DNA synthesis with the participation of polymerase alpha, followed by a period of less rapid, but more sustained, rate of DNA synthesis carried out by a ddTTP-sensitive enzyme, probably polymerase gamma. One interpretation of the results is that polymerase alpha functions in a strand displacement stage of the viral DNA replication mechanism, whereas polymerase gamma serves to convert the displaced single strands back to double-strand replicative form.

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