Abstract
The time course of expression of topoisomerase I, topoisomerase II, and simian virus 40 (SV40) large tumor (T) antigen was determined in whole-cell extracts of uninfected versus SV40-infected TC7 cells. After a minor increase, the level of topoisomerase I remained fairly constant throughout the time course in both uninfected and SV40-infected cells. In contrast, the level of topoisomerase II increased markedly in SV40-infected cells but not in uninfected cells following the appearance of SV40 T antigen.
Full text
PDF



Images in this article
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Borowiec J. A., Hurwitz J. Localized melting and structural changes in the SV40 origin of replication induced by T-antigen. EMBO J. 1988 Oct;7(10):3149–3158. doi: 10.1002/j.1460-2075.1988.tb03182.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Burnette W. N. "Western blotting": electrophoretic transfer of proteins from sodium dodecyl sulfate--polyacrylamide gels to unmodified nitrocellulose and radiographic detection with antibody and radioiodinated protein A. Anal Biochem. 1981 Apr;112(2):195–203. doi: 10.1016/0003-2697(81)90281-5. [DOI] [PubMed] [Google Scholar]
- Dean F. B., Bullock P., Murakami Y., Wobbe C. R., Weissbach L., Hurwitz J. Simian virus 40 (SV40) DNA replication: SV40 large T antigen unwinds DNA containing the SV40 origin of replication. Proc Natl Acad Sci U S A. 1987 Jan;84(1):16–20. doi: 10.1073/pnas.84.1.16. [DOI] [PMC free article] [PubMed] [Google Scholar]
- DiNardo S., Voelkel K., Sternglanz R. DNA topoisomerase II mutant of Saccharomyces cerevisiae: topoisomerase II is required for segregation of daughter molecules at the termination of DNA replication. Proc Natl Acad Sci U S A. 1984 May;81(9):2616–2620. doi: 10.1073/pnas.81.9.2616. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Garg L. C., DiAngelo S., Jacob S. T. Role of DNA topoisomerase I in the transcription of supercoiled rRNA gene. Proc Natl Acad Sci U S A. 1987 May;84(10):3185–3188. doi: 10.1073/pnas.84.10.3185. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Halligan B. D., Edwards K. A., Liu L. F. Purification and characterization of a type II DNA topoisomerase from bovine calf thymus. J Biol Chem. 1985 Feb 25;260(4):2475–2482. [PubMed] [Google Scholar]
- Heck M. M., Earnshaw W. C. Topoisomerase II: A specific marker for cell proliferation. J Cell Biol. 1986 Dec;103(6 Pt 2):2569–2581. doi: 10.1083/jcb.103.6.2569. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Heck M. M., Hittelman W. N., Earnshaw W. C. Differential expression of DNA topoisomerases I and II during the eukaryotic cell cycle. Proc Natl Acad Sci U S A. 1988 Feb;85(4):1086–1090. doi: 10.1073/pnas.85.4.1086. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hirt B. Selective extraction of polyoma DNA from infected mouse cell cultures. J Mol Biol. 1967 Jun 14;26(2):365–369. doi: 10.1016/0022-2836(67)90307-5. [DOI] [PubMed] [Google Scholar]
- Hsiang Y. H., Wu H. Y., Liu L. F. Proliferation-dependent regulation of DNA topoisomerase II in cultured human cells. Cancer Res. 1988 Jun 1;48(11):3230–3235. [PubMed] [Google Scholar]
- Li J. J., Kelly T. J. Simian virus 40 DNA replication in vitro. Proc Natl Acad Sci U S A. 1984 Nov;81(22):6973–6977. doi: 10.1073/pnas.81.22.6973. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Liu L. F., Miller K. G. Eukaryotic DNA topoisomerases: two forms of type I DNA topoisomerases from HeLa cell nuclei. Proc Natl Acad Sci U S A. 1981 Jun;78(6):3487–3491. doi: 10.1073/pnas.78.6.3487. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Robb J. A., Huebner K. Effect of cell chromosome number on simian virus 40 replication. Exp Cell Res. 1973 Sep;81(1):120–126. doi: 10.1016/0014-4827(73)90118-3. [DOI] [PubMed] [Google Scholar]
- Schirmbeck R., Deppert W. Specific interaction of simian virus 40 large T antigen with cellular chromatin and nuclear matrix during the course of infection. J Virol. 1987 Nov;61(11):3561–3569. doi: 10.1128/jvi.61.11.3561-3569.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Schmitt M. K., Mann K. Glycosylation of simian virus 40 T antigen and localization of glycosylated T antigen in the nuclear matrix. Virology. 1987 Feb;156(2):268–281. doi: 10.1016/0042-6822(87)90407-7. [DOI] [PubMed] [Google Scholar]
- Snapka R. M., Powelson M. A., Strayer J. M. Swiveling and decatenation of replicating simian virus 40 genomes in vivo. Mol Cell Biol. 1988 Feb;8(2):515–521. doi: 10.1128/mcb.8.2.515. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Stahl H., Dröge P., Zentgraf H., Knippers R. A large-tumor-antigen-specific monoclonal antibody inhibits DNA replication of simian virus 40 minichromosomes in an in vitro elongation system. J Virol. 1985 May;54(2):473–482. doi: 10.1128/jvi.54.2.473-482.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sundin O., Varshavsky A. Arrest of segregation leads to accumulation of highly intertwined catenated dimers: dissection of the final stages of SV40 DNA replication. Cell. 1981 Sep;25(3):659–669. doi: 10.1016/0092-8674(81)90173-2. [DOI] [PubMed] [Google Scholar]
- Tack L. C., DePamphilis M. L. Analysis of simian virus 40 chromosome-T-antigen complexes: T-antigen is preferentially associated with early replicating DNA intermediates. J Virol. 1983 Oct;48(1):281–295. doi: 10.1128/jvi.48.1.281-295.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tegtmeyer P. Simian virus 40 deoxyribonucleic acid synthesis: the viral replicon. J Virol. 1972 Oct;10(4):591–598. doi: 10.1128/jvi.10.4.591-598.1972. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wang J. C. DNA topoisomerases. Annu Rev Biochem. 1985;54:665–697. doi: 10.1146/annurev.bi.54.070185.003313. [DOI] [PubMed] [Google Scholar]
- Wiekowski M., Dröge P., Stahl H. Monoclonal antibodies as probes for a function of large T antigen during the elongation process of simian virus 40 DNA replication. J Virol. 1987 Feb;61(2):411–418. doi: 10.1128/jvi.61.2.411-418.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wold M. S., Li J. J., Kelly T. J. Initiation of simian virus 40 DNA replication in vitro: large-tumor-antigen- and origin-dependent unwinding of the template. Proc Natl Acad Sci U S A. 1987 Jun;84(11):3643–3647. doi: 10.1073/pnas.84.11.3643. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Yang L., Wold M. S., Li J. J., Kelly T. J., Liu L. F. Roles of DNA topoisomerases in simian virus 40 DNA replication in vitro. Proc Natl Acad Sci U S A. 1987 Feb;84(4):950–954. doi: 10.1073/pnas.84.4.950. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Zhang H., Wang J. C., Liu L. F. Involvement of DNA topoisomerase I in transcription of human ribosomal RNA genes. Proc Natl Acad Sci U S A. 1988 Feb;85(4):1060–1064. doi: 10.1073/pnas.85.4.1060. [DOI] [PMC free article] [PubMed] [Google Scholar]

