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. 1982 Aug;43(2):679–686. doi: 10.1128/jvi.43.2.679-686.1982

Resistance of Adenoviral DNA Replication to Aphidicolin Is Dependent on the 72-Kilodalton DNA-Binding Protein

David A Foster 1, Petros Hantzopoulos 1, Geoffrey Zubay 1
PMCID: PMC256170  PMID: 6809958

Abstract

Aphidicolin is a highly specific inhibitor of DNA polymerase α and has been most useful for assessing the role of this enzyme in various replication processes (J. A. Huberman, Cell 23:647-648, 1981). Both nuclear DNA replication and simian virus 40 DNA replication are highly sensitive to this drug (Krokan et al., Biochemistry 18:4431-4443, 1979), whereas mitochondrial DNA synthesis is completely insensitive (Zimmerman et al., J. Biol. Chem. 255:11847-11852, 1980). Adenovirus DNA replication is sensitive to aphidicolin, but only at much higher concentrations. These patterns of sensitivity are seen both in vivo and in vitro (Krokan et al., Biochemistry 18:4431-4443, 1979). A temperature-sensitive mutant of adenovirus type 5 known as H5ts125 is able to complete but not initiate new rounds of replication at nonpermissive temperatures (P. C. van der Vliet and J. S. Sussenbach, Virology 67:415-426, 1975). When cells infected with H5ts125 were shifted from permissive (33°C) to nonpermissive (41°C) conditions, the residual DNA synthesis (elongation) showed a striking increase in sensitivity to aphidicolin. The temperature-sensitive mutation of H5ts125 is in the gene for the 72-kilodalton single-stranded DNA-binding protein. This demonstrated that the increased resistance to aphidicolin shown by adenovirus DNA replication was dependent on that protein. It also supports an elongation role for both DNA polymerase α and the 72-kilodalton single-stranded DNA-binding protein in adenovirus DNA replication. Further support for an elongation role of DNA polymerase α came from experiments with permissive temperature conditions and inhibiting levels of aphidicolin in which it was shown that newly initiated strands failed to elongate to completion.

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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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