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. 1984 Mar;49(3):652–657. doi: 10.1128/jvi.49.3.652-657.1984

Aphidicolin inhibition of the production of replicative-form DNA during bovine parvovirus infection.

A T Robertson, E R Stout, R C Bates
PMCID: PMC255520  PMID: 6422050

Abstract

Since parvoviruses apparently do not possess a DNA polymerase activity, one or more of the host cell DNA polymerases must be responsible for replicating the single-stranded DNA genome. We have focused on determining which polymerase, alpha, beta, or gamma (pol alpha, pol beta, or pol gamma, respectively), is responsible for the first step in bovine parvoviral DNA replication: conversion of the single-stranded DNA genome to a parental replicative form (RF). In this study, we used aphidicolin, a specific inhibitor of DNA pol alpha, to assay for the requirement of pol alpha activity in parental RF formation in vivo. Synchronized cell cultures were infected with bovine parvovirus with or without aphidicolin, and the products of viral replication were separated on agarose gels and identified by Southern blot analysis. We found that complete inhibition of viral DNA synthesis resulted when 20 microM aphidicolin was present throughout the infection. In addition, viral DNA synthesis was inhibited by as little as 1 microM aphidicolin, whereas lower concentrations (0.1 and 0.01 microM) resulted in partial inhibition of the replication process. Using 32P-labeled bovine parvovirus as the input virus we differentiated parental RF from daughter RF and progeny DNA synthesis. We conclude that DNA pol alpha is required for the production of RF during bovine parvovirus replication in vivo and that this requirement is most likely for the conversion of bovine parvovirus input single-stranded DNA to parental RF. These results do not rule out a possible role for DNA pol gamma in the first step, nor do they rule out a role for pol alpha or pol gamma in later stages of the replication cycle.

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Selected References

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