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. 1991 Dec 25;19(24):6855–6861. doi: 10.1093/nar/19.24.6855

Generation of a large library of point mutations in polyoma middle T antigen.

B J Druker 1, T M Roberts 1
PMCID: PMC329320  PMID: 1662365

Abstract

Polyoma middle T antigen (MTAg) transforms cells by associating with and activating a variety of intracellular proteins, including src family members and a phosphatidylinositol-3 kinase. In order to assist in the study of the relative importance of the various associated biochemical activities for transformation by polyomavirus MTAg, a library of MTAg mutants was constructed. Chemically mutagenized MTAg DNA was purified from wild-type DNA by separation on denaturing gradient gels and placed into a recombinant retrovirus vector. Utilizing the resultant library of MTAg-expressing retroviruses, fibroblast cell lines expressing retroviruses, fibroblast cell lines expressing individual MTAg mutants were generated and screened for a non-transformed morphology. Of the first seven non-transformed clones tested, all express the MTAg protein. We estimate that approximately 24% of the G418-resistant colonies contain a transformation-defective MTAg mutant. A more thorough evaluation of one such clone revealed four single base-pair changes as compared to wild-type. Further genetic dissection of this mutant reveals that substituting leucine for proline at amino acid 248 results in a completely transformation defective MTAg. The utility of this mutagenesis and screening procedure as well as the description of several new MTAg mutants is described. This library of mutations should be of general interest for studying the transforming ability of MTAg.

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Selected References

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  1. Benjamin T. L. Host range mutants of polyoma virus. Proc Natl Acad Sci U S A. 1970 Sep;67(1):394–399. doi: 10.1073/pnas.67.1.394. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. 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]
  3. Botchan M., Topp W., Sambrook J. Studies on simian virus 40 excision from cellular chromosomes. Cold Spring Harb Symp Quant Biol. 1979;43(Pt 2):709–719. doi: 10.1101/sqb.1979.043.01.079. [DOI] [PubMed] [Google Scholar]
  4. Carmichael G. G., Schaffhausen B. S., Dorsky D. I., Oliver D. B., Benjamin T. L. Carboxy terminus of polyoma middle-sized tumor antigen is required for attachment to membranes, associated protein kinase activities, and cell transformation. Proc Natl Acad Sci U S A. 1982 Jun;79(11):3579–3583. doi: 10.1073/pnas.79.11.3579. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Cepko C. L., Roberts B. E., Mulligan R. C. Construction and applications of a highly transmissible murine retrovirus shuttle vector. Cell. 1984 Jul;37(3):1053–1062. doi: 10.1016/0092-8674(84)90440-9. [DOI] [PubMed] [Google Scholar]
  6. 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]
  7. Cherington V., Morgan B., Spiegelman B. M., Roberts T. M. Recombinant retroviruses that transduce individual polyoma tumor antigens: effects on growth and differentiation. Proc Natl Acad Sci U S A. 1986 Jun;83(12):4307–4311. doi: 10.1073/pnas.83.12.4307. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. 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]
  9. 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]
  10. 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]
  11. 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]
  12. Donoghue D. J., Anderson C., Hunter T., Kaplan P. L. Transmission of the polyoma virus middle T gene as the oncogene of a murine retrovirus. Nature. 1984 Apr 19;308(5961):748–750. doi: 10.1038/308748a0. [DOI] [PubMed] [Google Scholar]
  13. Druker B. J., Ling L. E., Cohen B., Roberts T. M., Schaffhausen B. S. A completely transformation-defective point mutant of polyomavirus middle T antigen which retains full associated phosphatidylinositol kinase activity. J Virol. 1990 Sep;64(9):4454–4461. doi: 10.1128/jvi.64.9.4454-4461.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Gluzman Y. SV40-transformed simian cells support the replication of early SV40 mutants. Cell. 1981 Jan;23(1):175–182. doi: 10.1016/0092-8674(81)90282-8. [DOI] [PubMed] [Google Scholar]
  15. Graham F. L., van der Eb A. J. A new technique for the assay of infectivity of human adenovirus 5 DNA. Virology. 1973 Apr;52(2):456–467. doi: 10.1016/0042-6822(73)90341-3. [DOI] [PubMed] [Google Scholar]
  16. Griffin B. E., Ito Y., Novak U., Spurr N., Dilworth S., Smolar N., Pollack R., Smith K., Rifkin D. B. Early mutants of polyoma virus (dl8 and dl23) with altered transformation properties: is polyoma virus middle T antigen a transforming gene product? Cold Spring Harb Symp Quant Biol. 1980;44(Pt 1):271–283. doi: 10.1101/sqb.1980.044.01.031. [DOI] [PubMed] [Google Scholar]
  17. 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]
  18. Ito Y., Spurr N., Griffin B. E. Middle T antigen as primary inducer of full expression of the phenotype of transformation by polyoma virus. J Virol. 1980 Jul;35(1):219–232. doi: 10.1128/jvi.35.1.219-232.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. 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]
  20. Kaplan D. R., Whitman M., Schaffhausen B., Raptis L., Garcea R. L., Pallas D., Roberts T. M., Cantley L. Phosphatidylinositol metabolism and polyoma-mediated transformation. Proc Natl Acad Sci U S A. 1986 Jun;83(11):3624–3628. doi: 10.1073/pnas.83.11.3624. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Kaplan P. L., Simon S., Eckhart W. Polyomavirus middle T protein encoded by a retrovirus transforms nonestablished chicken embryo cells. J Virol. 1985 Dec;56(3):1023–1026. doi: 10.1128/jvi.56.3.1023-1026.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Korman A. J., Frantz J. D., Strominger J. L., Mulligan R. C. Expression of human class II major histocompatibility complex antigens using retrovirus vectors. Proc Natl Acad Sci U S A. 1987 Apr;84(8):2150–2154. doi: 10.1073/pnas.84.8.2150. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Kornbluth S., Cross F. R., Harbison M., Hanafusa H. Transformation of chicken embryo fibroblasts and tumor induction by the middle T antigen of polyomavirus carried in an avian retroviral vector. Mol Cell Biol. 1986 May;6(5):1545–1551. doi: 10.1128/mcb.6.5.1545. [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. Louie R. R., King C. S., MacAuley A., Marth J. D., Perlmutter R. M., Eckhart W., Cooper J. A. p56lck protein-tyrosine kinase is cytoskeletal and does not bind to polyomavirus middle T antigen. J Virol. 1988 Dec;62(12):4673–4679. doi: 10.1128/jvi.62.12.4673-4679.1988. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Markland W., Cheng S. H., Oostra B. A., Smith A. E. In vitro mutagenesis of the putative membrane-binding domain of polyomavirus middle-T antigen. J Virol. 1986 Jul;59(1):82–89. doi: 10.1128/jvi.59.1.82-89.1986. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Markland W., Smith A. E. Mutants of polyomavirus middle-T antigen. Biochim Biophys Acta. 1987 Nov 25;907(3):299–321. doi: 10.1016/0304-419x(87)90011-4. [DOI] [PubMed] [Google Scholar]
  28. Morgan W. C., Kaplan D. R., Pallas D. C., Roberts T. M. Recombinant retroviruses that transduce middle T antigen cDNAs derived from polyomavirus mutants: separation of focus formation and soft-agar growth in transformation assays and correlations with kinase activities in vitro. J Virol. 1988 Sep;62(9):3407–3414. doi: 10.1128/jvi.62.9.3407-3414.1988. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Morrison D. K., Browning P. J., White M. F., Roberts T. M. Tyrosine phosphorylations in vivo associated with v-fms transformation. Mol Cell Biol. 1988 Jan;8(1):176–185. doi: 10.1128/mcb.8.1.176. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Myers R. M., Fischer S. G., Lerman L. S., Maniatis T. Nearly all single base substitutions in DNA fragments joined to a GC-clamp can be detected by denaturing gradient gel electrophoresis. Nucleic Acids Res. 1985 May 10;13(9):3131–3145. doi: 10.1093/nar/13.9.3131. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Myers R. M., Fischer S. G., Maniatis T., Lerman L. S. Modification of the melting properties of duplex DNA by attachment of a GC-rich DNA sequence as determined by denaturing gradient gel electrophoresis. Nucleic Acids Res. 1985 May 10;13(9):3111–3129. doi: 10.1093/nar/13.9.3111. [DOI] [PMC free article] [PubMed] [Google Scholar]
  32. Myers R. M., Lerman L. S., Maniatis T. A general method for saturation mutagenesis of cloned DNA fragments. Science. 1985 Jul 19;229(4710):242–247. doi: 10.1126/science.2990046. [DOI] [PubMed] [Google Scholar]
  33. Myers R. M., Maniatis T., Lerman L. S. Detection and localization of single base changes by denaturing gradient gel electrophoresis. Methods Enzymol. 1987;155:501–527. doi: 10.1016/0076-6879(87)55033-9. [DOI] [PubMed] [Google Scholar]
  34. Nilsson S. V., Tyndall C., Magnusson G. Deletion mapping of a short polyoma virus middle T antigen segment important for transformation. J Virol. 1983 Apr;46(1):284–287. doi: 10.1128/jvi.46.1.284-287.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. 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]
  36. Pallas D. C., Schley C., Mahoney M., Harlow E., Schaffhausen B. S., Roberts T. M. Polyomavirus small t antigen: overproduction in bacteria, purification, and utilization for monoclonal and polyclonal antibody production. J Virol. 1986 Dec;60(3):1075–1084. doi: 10.1128/jvi.60.3.1075-1084.1986. [DOI] [PMC free article] [PubMed] [Google Scholar]
  37. 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]
  38. Raptis L., Lamfrom H., Benjamin T. L. Regulation of cellular phenotype and expression of polyomavirus middle T antigen in rat fibroblasts. Mol Cell Biol. 1985 Sep;5(9):2476–2486. doi: 10.1128/mcb.5.9.2476. [DOI] [PMC free article] [PubMed] [Google Scholar]
  39. Rassoulzadegan M., Cowie A., Carr A., Glaichenhaus N., Kamen R., Cuzin F. The roles of individual polyoma virus early proteins in oncogenic transformation. Nature. 1982 Dec 23;300(5894):713–718. doi: 10.1038/300713a0. [DOI] [PubMed] [Google Scholar]
  40. 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]
  41. Soeda E., Arrand J. R., Smolar N., Walsh J. E., Griffin B. E. Coding potential and regulatory signals of the polyoma virus genome. Nature. 1980 Jan 31;283(5746):445–453. doi: 10.1038/283445a0. [DOI] [PubMed] [Google Scholar]
  42. 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]
  43. 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]

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