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. 1992 Apr;66(4):2551–2555. doi: 10.1128/jvi.66.4.2551-2555.1992

Simian virus 40 small t antigen trans activates the adenovirus E2A promoter by using mechanisms distinct from those used by adenovirus E1A.

M R Loeken 1
PMCID: PMC289057  PMID: 1532215

Abstract

As reported previously for simian virus 40 small t antigen, polyomavirus small t antigen stimulates transcription directed by the adenovirus E2A and VA-I promoters during transient transfection assays. To determine whether papovaviral small t antigens might employ biochemical mechanisms during transcription activation that are either similar to or distinct from other viral trans activators, I compared the abilities of simian virus 40 small t antigen and adenovirus E1A to regulate the E2A promoter during transient transfection assays. I determined that, whereas activation of the E2A promoter by E1A involves the transcription factors ATF and EIIF, activation by small t antigen involves only EIIF. The effects of cotransfecting maximal concentrations of plasmids encoding small t antigen with E1A suggested that they activate the E2A promoter by different mechanisms. To determine whether small t antigen employs a mechanism different from that encoded in E1A domain II, domain III, or both, I compared the effects of transfecting plasmids expressing small t antigen, the 12S product of E1A, or the 13S product with a mutation in domain II on trans activation of the E2A promoter in two cellular backgrounds. On the basis of these comparisons, it appears that small t antigen does not activate transcription by a mechanism similar to either of the activities encoded in E1A. This suggests that papovavirus small t antigens belong to a distinct class of trans-acting proteins.

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Selected References

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

  1. Bagchi S., Raychaudhuri P., Nevins J. R. Adenovirus E1A proteins can dissociate heteromeric complexes involving the E2F transcription factor: a novel mechanism for E1A trans-activation. Cell. 1990 Aug 24;62(4):659–669. doi: 10.1016/0092-8674(90)90112-r. [DOI] [PubMed] [Google Scholar]
  2. Bagchi S., Weinmann R., Raychaudhuri P. The retinoblastoma protein copurifies with E2F-I, an E1A-regulated inhibitor of the transcription factor E2F. Cell. 1991 Jun 14;65(6):1063–1072. doi: 10.1016/0092-8674(91)90558-g. [DOI] [PubMed] [Google Scholar]
  3. Bandara L. R., La Thangue N. B. Adenovirus E1a prevents the retinoblastoma gene product from complexing with a cellular transcription factor. Nature. 1991 Jun 6;351(6326):494–497. doi: 10.1038/351494a0. [DOI] [PubMed] [Google Scholar]
  4. Berk A. J., Sharp P. A. Structure of the adenovirus 2 early mRNAs. Cell. 1978 Jul;14(3):695–711. doi: 10.1016/0092-8674(78)90252-0. [DOI] [PubMed] [Google Scholar]
  5. Bikel I., Loeken M. R. Involvement of simian virus 40 (SV40) small t antigen in trans activation of SV40 early and late promoters. J Virol. 1992 Mar;66(3):1489–1494. doi: 10.1128/jvi.66.3.1489-1494.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Chellappan S. P., Hiebert S., Mudryj M., Horowitz J. M., Nevins J. R. The E2F transcription factor is a cellular target for the RB protein. Cell. 1991 Jun 14;65(6):1053–1061. doi: 10.1016/0092-8674(91)90557-f. [DOI] [PubMed] [Google Scholar]
  7. Chittenden T., Livingston D. M., Kaelin W. G., Jr The T/E1A-binding domain of the retinoblastoma product can interact selectively with a sequence-specific DNA-binding protein. Cell. 1991 Jun 14;65(6):1073–1082. doi: 10.1016/0092-8674(91)90559-h. [DOI] [PubMed] [Google Scholar]
  8. Chomczynski P., Sacchi N. Single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction. Anal Biochem. 1987 Apr;162(1):156–159. doi: 10.1006/abio.1987.9999. [DOI] [PubMed] [Google Scholar]
  9. Culp J. S., Webster L. C., Friedman D. J., Smith C. L., Huang W. J., Wu F. Y., Rosenberg M., Ricciardi R. P. The 289-amino acid E1A protein of adenovirus binds zinc in a region that is important for trans-activation. Proc Natl Acad Sci U S A. 1988 Sep;85(17):6450–6454. doi: 10.1073/pnas.85.17.6450. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Edmonds C., Vousden K. H. A point mutational analysis of human papillomavirus type 16 E7 protein. J Virol. 1989 Jun;63(6):2650–2656. doi: 10.1128/jvi.63.6.2650-2656.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Frisque R. J., Bream G. L., Cannella M. T. Human polyomavirus JC virus genome. J Virol. 1984 Aug;51(2):458–469. doi: 10.1128/jvi.51.2.458-469.1984. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Guilfoyle R., Weinmann R. Control region for adenovirus VA RNA transcription. Proc Natl Acad Sci U S A. 1981 Jun;78(6):3378–3382. doi: 10.1073/pnas.78.6.3378. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Hardy S., Engel D. A., Shenk T. An adenovirus early region 4 gene product is required for induction of the infection-specific form of cellular E2F activity. Genes Dev. 1989 Jul;3(7):1062–1074. doi: 10.1101/gad.3.7.1062. [DOI] [PubMed] [Google Scholar]
  14. Huang M. M., Hearing P. The adenovirus early region 4 open reading frame 6/7 protein regulates the DNA binding activity of the cellular transcription factor, E2F, through a direct complex. Genes Dev. 1989 Nov;3(11):1699–1710. doi: 10.1101/gad.3.11.1699. [DOI] [PubMed] [Google Scholar]
  15. Imperiale M. J., Feldman L. T., Nevins J. R. Activation of gene expression by adenovirus and herpesvirus regulatory genes acting in trans and by a cis-acting adenovirus enhancer element. Cell. 1983 Nov;35(1):127–136. doi: 10.1016/0092-8674(83)90215-5. [DOI] [PubMed] [Google Scholar]
  16. Imperiale M. J., Hart R. P., Nevins J. R. An enhancer-like element in the adenovirus E2 promoter contains sequences essential for uninduced and E1A-induced transcription. Proc Natl Acad Sci U S A. 1985 Jan;82(2):381–385. doi: 10.1073/pnas.82.2.381. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Lee K. A., Fink J. S., Goodman R. H., Green M. R. Distinguishable promoter elements are involved in transcriptional activation by E1a and cyclic AMP. Mol Cell Biol. 1989 Oct;9(10):4390–4397. doi: 10.1128/mcb.9.10.4390. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Lillie J. W., Loewenstein P. M., Green M. R., Green M. Functional domains of adenovirus type 5 E1a proteins. Cell. 1987 Sep 25;50(7):1091–1100. doi: 10.1016/0092-8674(87)90175-9. [DOI] [PubMed] [Google Scholar]
  19. Loeken M. R., Brady J. The adenovirus EIIA enhancer. Analysis of regulatory sequences and changes in binding activity of ATF and EIIF following adenovirus infection. J Biol Chem. 1989 Apr 15;264(11):6572–6579. [PubMed] [Google Scholar]
  20. Loeken M. R., Khoury G., Brady J. Stimulation of the adenovirus E2 promoter by simian virus 40 T antigen or E1A occurs by different mechanisms. Mol Cell Biol. 1986 Jun;6(6):2020–2026. doi: 10.1128/mcb.6.6.2020. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Loeken M., Bikel I., Livingston D. M., Brady J. trans-activation of RNA polymerase II and III promoters by SV40 small t antigen. Cell. 1988 Dec 23;55(6):1171–1177. doi: 10.1016/0092-8674(88)90261-9. [DOI] [PubMed] [Google Scholar]
  22. Manohar C. F., Kratochvil J., Thimmapaya B. The adenovirus EII early promoter has multiple EIA-sensitive elements, two of which function cooperatively in basal and virus-induced transcription. J Virol. 1990 Jun;64(6):2457–2466. doi: 10.1128/jvi.64.6.2457-2466.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Moran E., Zerler B., Harrison T. M., Mathews M. B. Identification of separate domains in the adenovirus E1A gene for immortalization activity and the activation of virus early genes. Mol Cell Biol. 1986 Oct;6(10):3470–3480. doi: 10.1128/mcb.6.10.3470. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Pallas D. C., Shahrik L. K., Martin B. L., Jaspers S., Miller T. B., Brautigan D. L., Roberts T. M. Polyoma small and middle T antigens and SV40 small t antigen form stable complexes with protein phosphatase 2A. Cell. 1990 Jan 12;60(1):167–176. doi: 10.1016/0092-8674(90)90726-u. [DOI] [PubMed] [Google Scholar]
  25. Phelps W. C., Yee C. L., Münger K., Howley P. M. The human papillomavirus type 16 E7 gene encodes transactivation and transformation functions similar to those of adenovirus E1A. Cell. 1988 May 20;53(4):539–547. doi: 10.1016/0092-8674(88)90570-3. [DOI] [PubMed] [Google Scholar]
  26. Raychaudhuri P., Bagchi S., Neill S. D., Nevins J. R. Activation of the E2F transcription factor in adenovirus-infected cells involves E1A-dependent stimulation of DNA-binding activity and induction of cooperative binding mediated by an E4 gene product. J Virol. 1990 Jun;64(6):2702–2710. doi: 10.1128/jvi.64.6.2702-2710.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Reichel R., Neill S. D., Kovesdi I., Simon M. C., Raychaudhuri P., Nevins J. R. The adenovirus E4 gene, in addition to the E1A gene, is important for trans-activation of E2 transcription and for E2F activation. J Virol. 1989 Sep;63(9):3643–3650. doi: 10.1128/jvi.63.9.3643-3650.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Simon M. C., Kitchener K., Kao H. T., Hickey E., Weber L., Voellmy R., Heintz N., Nevins J. R. Selective induction of human heat shock gene transcription by the adenovirus E1A gene products, including the 12S E1A product. Mol Cell Biol. 1987 Aug;7(8):2884–2890. doi: 10.1128/mcb.7.8.2884. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Walter G., Ruediger R., Slaughter C., Mumby M. Association of protein phosphatase 2A with polyoma virus medium tumor antigen. Proc Natl Acad Sci U S A. 1990 Apr;87(7):2521–2525. doi: 10.1073/pnas.87.7.2521. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Zajchowski D. A., Boeuf H., Kédinger C. E1a inducibility of the adenoviral early E2a promoter is determined by specific combinations of sequence elements. Gene. 1987;58(2-3):243–256. doi: 10.1016/0378-1119(87)90379-9. [DOI] [PubMed] [Google Scholar]
  31. Zhu Z. Y., Veldman G. M., Cowie A., Carr A., Schaffhausen B., Kamen R. Construction and functional characterization of polyomavirus genomes that separately encode the three early proteins. J Virol. 1984 Jul;51(1):170–180. doi: 10.1128/jvi.51.1.170-180.1984. [DOI] [PMC free article] [PubMed] [Google Scholar]

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