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. 1992 Mar;66(3):1458–1467. doi: 10.1128/jvi.66.3.1458-1467.1992

Characterization of the interaction of polyomavirus middle T antigen with type 2A protein phosphatase.

E T Ulug 1, A J Cartwright 1, S A Courtneidge 1
PMCID: PMC240870  PMID: 1371166

Abstract

Two cellular proteins of 36 and 63 kDa which bind the small T and middle T antigens of polyomavirus recently have been identified as the catalytic and regulatory subunits of the phosphoserine/threonine-specific type 2A protein phosphatase (PP2A). We report here the presence of phosphoseryl phosphatase activity associated with polyomavirus small T and middle T antigens in immunoprecipitates prepared from virus-infected and transformed cells. Phosphatase activity was also found associated with middle T-antigen mutants, some of which had been defined previously to associate with 36- and 63-kDa cellular proteins. Middle T-antigen-associated phosphatase activity was sensitive to okadaic acid and microcystin-LR, inhibitors of PP2A, and insensitive to inhibitor 1 or 2, orthovanadate, or EDTA. Using antiserum specific for the catalytic subunit of PP2A, we found that unlike the majority of PP2A, middle T-antigen-bound PP2A was membrane associated. However, no gross change in the amount, activity, or localization of PP2A could be attributed to middle T-antigen expression in transformed cells. Anti-PP2A antibodies coprecipitated a 63-kDa protein from normal cells and in addition coprecipitated middle T antigen, 60- and 61-kDa proteins (identified as src family members), and an 81-kDa protein from middle T-antigen-transformed cells. Furthermore, we detected protein kinase activity in PP2A immunoprecipitates and protein phosphatase activity in src immune complexes from extracts of middle T-antigen-transformed, but not normal, cells. These results reinforce the notion that at least a portion of middle T antigen bridges a protein kinase with a protein phosphatase.

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Selected References

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

  1. Alexander D., Goris J., Marais R., Rothbard J., Merlevede W., Crumpton M. J. Dephosphorylation of the human T lymphocyte CD3 antigen. Eur J Biochem. 1989 Apr 15;181(1):55–65. doi: 10.1111/j.1432-1033.1989.tb14693.x. [DOI] [PubMed] [Google Scholar]
  2. Bialojan C., Takai A. Inhibitory effect of a marine-sponge toxin, okadaic acid, on protein phosphatases. Specificity and kinetics. Biochem J. 1988 Nov 15;256(1):283–290. doi: 10.1042/bj2560283. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Bolen J. B., Thiele C. J., Israel M. A., Yonemoto W., Lipsich L. A., Brugge J. S. Enhancement of cellular src gene product associated tyrosyl kinase activity following polyoma virus infection and transformation. Cell. 1984 Oct;38(3):767–777. doi: 10.1016/0092-8674(84)90272-1. [DOI] [PubMed] [Google Scholar]
  4. Carpenter C. L., Duckworth B. C., Auger K. R., Cohen B., Schaffhausen B. S., Cantley L. C. Purification and characterization of phosphoinositide 3-kinase from rat liver. J Biol Chem. 1990 Nov 15;265(32):19704–19711. [PubMed] [Google Scholar]
  5. Cartwright C. A., Kaplan P. L., Cooper J. A., Hunter T., Eckhart W. Altered sites of tyrosine phosphorylation in pp60c-src associated with polyomavirus middle tumor antigen. Mol Cell Biol. 1986 May;6(5):1562–1570. doi: 10.1128/mcb.6.5.1562. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Cheng S. H., Espino P. C., Marshall J., Harvey R., Smith A. E. Stoichiometry of cellular and viral components in the polyomavirus middle-T antigen-tyrosine kinase complex. Mol Cell Biol. 1990 Oct;10(10):5569–5574. doi: 10.1128/mcb.10.10.5569. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Cheng S. H., Harvey R., Espino P. C., Semba K., Yamamoto T., Toyoshima K., Smith A. E. Peptide antibodies to the human c-fyn gene product demonstrate pp59c-fyn is capable of complex formation with the middle-T antigen of polyomavirus. EMBO J. 1988 Dec 1;7(12):3845–3855. doi: 10.1002/j.1460-2075.1988.tb03270.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Cohen P., Holmes C. F., Tsukitani Y. Okadaic acid: a new probe for the study of cellular regulation. Trends Biochem Sci. 1990 Mar;15(3):98–102. doi: 10.1016/0968-0004(90)90192-e. [DOI] [PubMed] [Google Scholar]
  9. Cohen P. The structure and regulation of protein phosphatases. Annu Rev Biochem. 1989;58:453–508. doi: 10.1146/annurev.bi.58.070189.002321. [DOI] [PubMed] [Google Scholar]
  10. Courtneidge S. A. Activation of the pp60c-src kinase by middle T antigen binding or by dephosphorylation. EMBO J. 1985 Jun;4(6):1471–1477. doi: 10.1002/j.1460-2075.1985.tb03805.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Courtneidge S. A., Heber A. An 81 kd protein complexed with middle T antigen and pp60c-src: a possible phosphatidylinositol kinase. Cell. 1987 Sep 25;50(7):1031–1037. doi: 10.1016/0092-8674(87)90169-3. [DOI] [PubMed] [Google Scholar]
  12. Courtneidge S. A., Kypta R. M., Ulug E. T. Interactions between the middle T antigen of polyomavirus and host cell proteins. Cold Spring Harb Symp Quant Biol. 1988;53(Pt 1):153–160. doi: 10.1101/sqb.1988.053.01.021. [DOI] [PubMed] [Google Scholar]
  13. Courtneidge S. A., Read M., Wilson J. B., Fried M. Cytoplasmic interaction between pp60c-src and a truncated polyoma virus middle T antigen. Oncogene Res. 1989;4(1):75–80. [PubMed] [Google Scholar]
  14. Courtneidge S. A., Smith A. E. Polyoma virus transforming protein associates with the product of the c-src cellular gene. Nature. 1983 Jun 2;303(5916):435–439. doi: 10.1038/303435a0. [DOI] [PubMed] [Google Scholar]
  15. Courtneidge S. A., Smith A. E. The complex of polyoma virus middle-T antigen and pp60c-src. EMBO J. 1984 Mar;3(3):585–591. doi: 10.1002/j.1460-2075.1984.tb01852.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Escobedo J. A., Navankasattusas S., Kavanaugh W. M., Milfay D., Fried V. A., Williams L. T. cDNA cloning of a novel 85 kd protein that has SH2 domains and regulates binding of PI3-kinase to the PDGF beta-receptor. Cell. 1991 Apr 5;65(1):75–82. doi: 10.1016/0092-8674(91)90409-r. [DOI] [PubMed] [Google Scholar]
  17. Goris J., Pallen C. J., Parker P. J., Hermann J., Waterfield M. D., Merlevede W. Conversion of a phosphoseryl/threonyl phosphatase into a phosphotyrosyl phosphatase. Biochem J. 1988 Dec 15;256(3):1029–1034. doi: 10.1042/bj2561029. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Grussenmeyer T., Carbone-Wiley A., Scheidtmann K. H., Walter G. Interactions between polyomavirus medium T antigen and three cellular proteins of 88, 61, and 37 kilodaltons. J Virol. 1987 Dec;61(12):3902–3909. doi: 10.1128/jvi.61.12.3902-3909.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Grussenmeyer T., Scheidtmann K. H., Hutchinson M. A., Eckhart W., Walter G. Complexes of polyoma virus medium T antigen and cellular proteins. Proc Natl Acad Sci U S A. 1985 Dec;82(23):7952–7954. doi: 10.1073/pnas.82.23.7952. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. Harvey R., Oostra B. A., Belsham G. J., Gillett P., Smith A. E. An antibody to a synthetic peptide recognizes polyomavirus middle-T antigen and reveals multiple in vitro tyrosine phosphorylation sites. Mol Cell Biol. 1984 Jul;4(7):1334–1342. doi: 10.1128/mcb.4.7.1334. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Horak I. D., Kawakami T., Gregory F., Robbins K. C., Bolen J. B. Association of p60fyn with middle tumor antigen in murine polyomavirus-transformed rat cells. J Virol. 1989 May;63(5):2343–2347. doi: 10.1128/jvi.63.5.2343-2347.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Kaplan D. R., Whitman M., Schaffhausen B., Pallas D. C., White M., Cantley L., Roberts T. M. Common elements in growth factor stimulation and oncogenic transformation: 85 kd phosphoprotein and phosphatidylinositol kinase activity. Cell. 1987 Sep 25;50(7):1021–1029. doi: 10.1016/0092-8674(87)90168-1. [DOI] [PubMed] [Google Scholar]
  23. Koch W., Carbone A., Walter G. Purified polyoma virus medium T antigen has tyrosine-specific protein kinase activity but no significant phosphatidylinositol kinase activity. Mol Cell Biol. 1986 Jun;6(6):1866–1874. doi: 10.1128/mcb.6.6.1866. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Kornbluth S., Sudol M., Hanafusa H. Association of the polyomavirus middle-T antigen with c-yes protein. Nature. 1987 Jan 8;325(7000):171–173. doi: 10.1038/325171a0. [DOI] [PubMed] [Google Scholar]
  25. Kypta R. M., Hemming A., Courtneidge S. A. Identification and characterization of p59fyn (a src-like protein tyrosine kinase) in normal and polyoma virus transformed cells. EMBO J. 1988 Dec 1;7(12):3837–3844. doi: 10.1002/j.1460-2075.1988.tb03269.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Lipsich L. A., Lewis A. J., Brugge J. S. Isolation of monoclonal antibodies that recognize the transforming proteins of avian sarcoma viruses. J Virol. 1983 Nov;48(2):352–360. doi: 10.1128/jvi.48.2.352-360.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. MacKintosh C., Beattie K. A., Klumpp S., Cohen P., Codd G. A. Cyanobacterial microcystin-LR is a potent and specific inhibitor of protein phosphatases 1 and 2A from both mammals and higher plants. FEBS Lett. 1990 May 21;264(2):187–192. doi: 10.1016/0014-5793(90)80245-e. [DOI] [PubMed] [Google Scholar]
  28. Markland W., Smith A. E. Mapping of the amino-terminal half of polyomavirus middle-T antigen indicates that this region is the binding domain for pp60c-src. J Virol. 1987 Feb;61(2):285–292. doi: 10.1128/jvi.61.2.285-292.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Matthews J. T., Benjamin T. L. 12-O-tetradecanoylphorbol-13-acetate stimulates phosphorylation of the 58,000-Mr form of polyomavirus middle T antigen in vivo: implications for a possible role of protein kinase C in middle T function. J Virol. 1986 May;58(2):239–246. doi: 10.1128/jvi.58.2.239-246.1986. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Otsu M., Hiles I., Gout I., Fry M. J., Ruiz-Larrea F., Panayotou G., Thompson A., Dhand R., Hsuan J., Totty N. Characterization of two 85 kd proteins that associate with receptor tyrosine kinases, middle-T/pp60c-src complexes, and PI3-kinase. Cell. 1991 Apr 5;65(1):91–104. doi: 10.1016/0092-8674(91)90411-q. [DOI] [PubMed] [Google Scholar]
  31. Pallas D. C., Cherington V., Morgan W., DeAnda J., Kaplan D., Schaffhausen B., Roberts T. M. Cellular proteins that associate with the middle and small T antigens of polyomavirus. J Virol. 1988 Nov;62(11):3934–3940. doi: 10.1128/jvi.62.11.3934-3940.1988. [DOI] [PMC free article] [PubMed] [Google Scholar]
  32. 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]
  33. Raptis L., Boynton A. L., Whitfield J. F. Protein kinase C promotes the phosphorylation of immunoprecipitated middle T antigen from polyoma-transformed cells. Biochem Biophys Res Commun. 1986 May 14;136(3):995–1000. doi: 10.1016/0006-291x(86)90431-6. [DOI] [PubMed] [Google Scholar]
  34. Rundell K., Major E. O., Lampert M. Association of cellular 56,000- and 32,000-molecular-weight protein with BK virus and polyoma virus t-antigens. J Virol. 1981 Mar;37(3):1090–1093. doi: 10.1128/jvi.37.3.1090-1093.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Schaffhausen B., Benjamin T. L. Comparison of phosphorylation of two polyoma virus middle T antigens in vivo and in vitro. J Virol. 1981 Oct;40(1):184–196. doi: 10.1128/jvi.40.1.184-196.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
  36. Swarup G., Cohen S., Garbers D. L. Inhibition of membrane phosphotyrosyl-protein phosphatase activity by vanadate. Biochem Biophys Res Commun. 1982 Aug;107(3):1104–1109. doi: 10.1016/0006-291x(82)90635-0. [DOI] [PubMed] [Google Scholar]
  37. Talmage D. A., Freund R., Young A. T., Dahl J., Dawe C. J., Benjamin T. L. Phosphorylation of middle T by pp60c-src: a switch for binding of phosphatidylinositol 3-kinase and optimal tumorigenesis. Cell. 1989 Oct 6;59(1):55–65. doi: 10.1016/0092-8674(89)90869-6. [DOI] [PubMed] [Google Scholar]
  38. Templeton D., Voronova A., Eckhart W. Construction and expression of a recombinant DNA gene encoding a polyomavirus middle-size tumor antigen with the carboxyl terminus of the vesicular stomatitis virus glycoprotein G. Mol Cell Biol. 1984 Feb;4(2):282–289. doi: 10.1128/mcb.4.2.282. [DOI] [PMC free article] [PubMed] [Google Scholar]
  39. Treisman R., Novak U., Favaloro J., Kamen R. Transformation of rat cells by an altered polyoma virus genome expressing only the middle-T protein. Nature. 1981 Aug 13;292(5824):595–600. doi: 10.1038/292595a0. [DOI] [PubMed] [Google Scholar]
  40. Ulug E. T., Hawkins P. T., Hanley M. R., Courtneidge S. A. Phosphatidylinositol metabolism in cells transformed by polyomavirus middle T antigen. J Virol. 1990 Aug;64(8):3895–3904. doi: 10.1128/jvi.64.8.3895-3904.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
  41. Walter G., Carbone-Wiley A., Joshi B., Rundell K. Homologous cellular proteins associated with simian virus 40 small T antigen and polyomavirus medium T antigen. J Virol. 1988 Dec;62(12):4760–4762. doi: 10.1128/jvi.62.12.4760-4762.1988. [DOI] [PMC free article] [PubMed] [Google Scholar]
  42. Walter G., Ferre F., Espiritu O., Carbone-Wiley A. Molecular cloning and sequence of cDNA encoding polyoma medium tumor antigen-associated 61-kDa protein. Proc Natl Acad Sci U S A. 1989 Nov;86(22):8669–8672. doi: 10.1073/pnas.86.22.8669. [DOI] [PMC free article] [PubMed] [Google Scholar]
  43. 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]
  44. Whitman M., Kaplan D. R., Schaffhausen B., Cantley L., Roberts T. M. Association of phosphatidylinositol kinase activity with polyoma middle-T competent for transformation. Nature. 1985 May 16;315(6016):239–242. doi: 10.1038/315239a0. [DOI] [PubMed] [Google Scholar]
  45. Yang Y. C., Hearing P., Rundell K. Cellular proteins associated with simian virus 40 early gene products in newly infected cells. J Virol. 1979 Oct;32(1):147–154. doi: 10.1128/jvi.32.1.147-154.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]

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