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. 1989 Dec;86(24):9742–9746. doi: 10.1073/pnas.86.24.9742

Requirement for two DNA polymerases in the replication of simian virus 40 DNA in vitro.

D H Weinberg 1, T J Kelly 1
PMCID: PMC298577  PMID: 2574863

Abstract

DNA polymerase alpha-primase has long been considered the primary, if not sole, replicative DNA polymerase in eukaryotic cells. However, recent experiments have provided indirect evidence that a second DNA polymerase may play a role in DNA replication. To identify cellular proteins necessary for DNA synthesis in mammalian cells, we have been studying the cell-free system developed for the replication of simian virus 40 DNA. In this report, we present direct evidence that a second DNA polymerase is required in addition to DNA polymerase alpha-primase complex to obtain efficient replication of simian virus 40 origin-containing DNA. This DNA polymerase activity is not affected by monoclonal antibodies that inhibit the activity of DNA polymerase alpha and is relatively resistant to the inhibitor [N2-(p-n-butylphenyl)-9-(2-deoxy-beta-D-ribofuranosyl)guanine 5'-triphosphate]. Moreover, the activity of the polymerase is highly dependent upon the accessory protein, proliferating-cell nuclear antigen. These characteristics are consistent with the hypothesis that this second DNA polymerase is DNA polymerase delta.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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