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. 1994 Jun;68(6):3467–3477. doi: 10.1128/jvi.68.6.3467-3477.1994

The apoptotic suppressor P35 is required early during baculovirus replication and is targeted to the cytosol of infected cells.

P A Hershberger 1, D J LaCount 1, P D Friesen 1
PMCID: PMC236849  PMID: 8189486

Abstract

The p35 gene of Autographa californica nuclear polyhedrosis virus (AcMNPV) is required to block virus-induced apoptosis. The trans-dominant activity of p35 suppresses premature cell death and facilitates AcMNPV replication in a cell line- and host-specific manner. To characterize the p35 gene product (P35), a specific polyclonal antiserum was raised. As revealed by immunoblot analyses of wild-type AcMNPV-infected cells, P35 appeared early (8 to 12 h) and accumulated through the late stages of infection (24 to 36 h). Biochemical fractionation of cells both early and late in infection and indirect immunochemical staining demonstrated that P35 localized predominantly to the cytosol (150,000 x g supernatant); comparatively minor quantities of P35 were associated with intracellular membranes. The cytoplasmic localization of P35 was independent of virus infection. The functional significance of the early and late synthesis of P35 was examined by constructing recombinant viruses in which the timing and level of p35 expression were altered. Delaying P35 synthesis by placing p35 under exclusive control of a strong, very late promoter failed to suppress intracellular DNA fragmentation and apoptotic blebbing in most cells. Thus, earlier expression of p35 was required to block virus-induced apoptosis. Site-specific mutagenesis of the p35 promoter demonstrated that low levels of P35 were sufficient to block apoptosis, whereas higher levels were required to maintain wild-type virus gene expression. Consistent with an early role in infection, P35 was also detected in the budded form of AcMNPV. Because of the lack of sequence similarity and its cytosolic targeting, P35 may function in a manner that is mechanistically distinct from other apoptotic regulators, including Bcl-2 and the adenovirus E1B 19-kDa protein.

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Selected References

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

  1. Alnemri E. S., Robertson N. M., Fernandes T. F., Croce C. M., Litwack G. Overexpressed full-length human BCL2 extends the survival of baculovirus-infected Sf9 insect cells. Proc Natl Acad Sci U S A. 1992 Aug 15;89(16):7295–7299. doi: 10.1073/pnas.89.16.7295. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Blissard G. W., Rohrmann G. F. Baculovirus diversity and molecular biology. Annu Rev Entomol. 1990;35:127–155. doi: 10.1146/annurev.en.35.010190.001015. [DOI] [PubMed] [Google Scholar]
  3. Chou J., Roizman B. The gamma 1(34.5) gene of herpes simplex virus 1 precludes neuroblastoma cells from triggering total shutoff of protein synthesis characteristic of programed cell death in neuronal cells. Proc Natl Acad Sci U S A. 1992 Apr 15;89(8):3266–3270. doi: 10.1073/pnas.89.8.3266. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Cleary M. L., Smith S. D., Sklar J. Cloning and structural analysis of cDNAs for bcl-2 and a hybrid bcl-2/immunoglobulin transcript resulting from the t(14;18) translocation. Cell. 1986 Oct 10;47(1):19–28. doi: 10.1016/0092-8674(86)90362-4. [DOI] [PubMed] [Google Scholar]
  5. Clem R. J., Fechheimer M., Miller L. K. Prevention of apoptosis by a baculovirus gene during infection of insect cells. Science. 1991 Nov 29;254(5036):1388–1390. doi: 10.1126/science.1962198. [DOI] [PubMed] [Google Scholar]
  6. Clem R. J., Miller L. K. Apoptosis reduces both the in vitro replication and the in vivo infectivity of a baculovirus. J Virol. 1993 Jul;67(7):3730–3738. doi: 10.1128/jvi.67.7.3730-3738.1993. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Crook N. E., Clem R. J., Miller L. K. An apoptosis-inhibiting baculovirus gene with a zinc finger-like motif. J Virol. 1993 Apr;67(4):2168–2174. doi: 10.1128/jvi.67.4.2168-2174.1993. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Dickson J. A., Friesen P. D. Identification of upstream promoter elements mediating early transcription from the 35,000-molecular-weight protein gene of Autographa californica nuclear polyhedrosis virus. J Virol. 1991 Aug;65(8):4006–4016. doi: 10.1128/jvi.65.8.4006-4016.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Friesen P. D., Miller L. K. Divergent transcription of early 35- and 94-kilodalton protein genes encoded by the HindIII K genome fragment of the baculovirus Autographa californica nuclear polyhedrosis virus. J Virol. 1987 Jul;61(7):2264–2272. doi: 10.1128/jvi.61.7.2264-2272.1987. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Friesen P. D., Miller L. K. Temporal regulation of baculovirus RNA: overlapping early and late transcripts. J Virol. 1985 May;54(2):392–400. doi: 10.1128/jvi.54.2.392-400.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
  11. Gordon J. D., Carstens E. B. Phenotypic characterization and physical mapping of a temperature-sensitive mutant of Autographa californica nuclear polyhedrosis virus defective in DNA synthesis. Virology. 1984 Oct 15;138(1):69–81. doi: 10.1016/0042-6822(84)90148-x. [DOI] [PubMed] [Google Scholar]
  12. Gregory C. D., Dive C., Henderson S., Smith C. A., Williams G. T., Gordon J., Rickinson A. B. Activation of Epstein-Barr virus latent genes protects human B cells from death by apoptosis. Nature. 1991 Feb 14;349(6310):612–614. doi: 10.1038/349612a0. [DOI] [PubMed] [Google Scholar]
  13. Henderson S., Huen D., Rowe M., Dawson C., Johnson G., Rickinson A. Epstein-Barr virus-coded BHRF1 protein, a viral homologue of Bcl-2, protects human B cells from programmed cell death. Proc Natl Acad Sci U S A. 1993 Sep 15;90(18):8479–8483. doi: 10.1073/pnas.90.18.8479. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Henderson S., Rowe M., Gregory C., Croom-Carter D., Wang F., Longnecker R., Kieff E., Rickinson A. Induction of bcl-2 expression by Epstein-Barr virus latent membrane protein 1 protects infected B cells from programmed cell death. Cell. 1991 Jun 28;65(7):1107–1115. doi: 10.1016/0092-8674(91)90007-l. [DOI] [PubMed] [Google Scholar]
  15. Hershberger P. A., Dickson J. A., Friesen P. D. Site-specific mutagenesis of the 35-kilodalton protein gene encoded by Autographa californica nuclear polyhedrosis virus: cell line-specific effects on virus replication. J Virol. 1992 Sep;66(9):5525–5533. doi: 10.1128/jvi.66.9.5525-5533.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Hink W. F. Established insect cell line from the cabbage looper, Trichoplusia ni. Nature. 1970 May 2;226(5244):466–467. doi: 10.1038/226466b0. [DOI] [PubMed] [Google Scholar]
  17. Hockenbery D. M., Oltvai Z. N., Yin X. M., Milliman C. L., Korsmeyer S. J. Bcl-2 functions in an antioxidant pathway to prevent apoptosis. Cell. 1993 Oct 22;75(2):241–251. doi: 10.1016/0092-8674(93)80066-n. [DOI] [PubMed] [Google Scholar]
  18. Hockenbery D., Nuñez G., Milliman C., Schreiber R. D., Korsmeyer S. J. Bcl-2 is an inner mitochondrial membrane protein that blocks programmed cell death. Nature. 1990 Nov 22;348(6299):334–336. doi: 10.1038/348334a0. [DOI] [PubMed] [Google Scholar]
  19. Hohmann A. W., Faulkner P. Monoclonal antibodies to baculovirus structural proteins: determination of specificities by Western blot analysis. Virology. 1983 Mar;125(2):432–444. doi: 10.1016/0042-6822(83)90214-3. [DOI] [PubMed] [Google Scholar]
  20. Huh N. E., Weaver R. F. Identifying the RNA polymerases that synthesize specific transcripts of the Autographa californica nuclear polyhedrosis virus. J Gen Virol. 1990 Jan;71(Pt 1):195–201. doi: 10.1099/0022-1317-71-1-195. [DOI] [PubMed] [Google Scholar]
  21. Ishida Y., Agata Y., Shibahara K., Honjo T. Induced expression of PD-1, a novel member of the immunoglobulin gene superfamily, upon programmed cell death. EMBO J. 1992 Nov;11(11):3887–3895. doi: 10.1002/j.1460-2075.1992.tb05481.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Jarvis D. L., Bohlmeyer D. A., Garcia A., Jr Enhancement of polyhedrin nuclear localization during baculovirus infection. J Virol. 1992 Dec;66(12):6903–6911. doi: 10.1128/jvi.66.12.6903-6911.1992. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Kamita S. G., Majima K., Maeda S. Identification and characterization of the p35 gene of Bombyx mori nuclear polyhedrosis virus that prevents virus-induced apoptosis. J Virol. 1993 Jan;67(1):455–463. doi: 10.1128/jvi.67.1.455-463.1993. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Koerner T. J., Hill J. E., Myers A. M., Tzagoloff A. High-expression vectors with multiple cloning sites for construction of trpE fusion genes: pATH vectors. Methods Enzymol. 1991;194:477–490. doi: 10.1016/0076-6879(91)94036-c. [DOI] [PubMed] [Google Scholar]
  25. Kunkel T. A., Roberts J. D., Zakour R. A. Rapid and efficient site-specific mutagenesis without phenotypic selection. Methods Enzymol. 1987;154:367–382. doi: 10.1016/0076-6879(87)54085-x. [DOI] [PubMed] [Google Scholar]
  26. Laemmli U. K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970 Aug 15;227(5259):680–685. doi: 10.1038/227680a0. [DOI] [PubMed] [Google Scholar]
  27. Lee H. H., Miller L. K. Isolation of genotypic variants of Autographa californica nuclear polyhedrosis virus. J Virol. 1978 Sep;27(3):754–767. doi: 10.1128/jvi.27.3.754-767.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  28. Lerch R. A., Friesen P. D. The 35-kilodalton protein gene (p35) of Autographa californica nuclear polyhedrosis virus and the neomycin resistance gene provide dominant selection of recombinant baculoviruses. Nucleic Acids Res. 1993 Apr 25;21(8):1753–1760. doi: 10.1093/nar/21.8.1753. [DOI] [PMC free article] [PubMed] [Google Scholar]
  29. Levine B., Huang Q., Isaacs J. T., Reed J. C., Griffin D. E., Hardwick J. M. Conversion of lytic to persistent alphavirus infection by the bcl-2 cellular oncogene. Nature. 1993 Feb 25;361(6414):739–742. doi: 10.1038/361739a0. [DOI] [PubMed] [Google Scholar]
  30. Miller L. K. Baculoviruses as gene expression vectors. Annu Rev Microbiol. 1988;42:177–199. doi: 10.1146/annurev.mi.42.100188.001141. [DOI] [PubMed] [Google Scholar]
  31. Nissen M. S., Friesen P. D. Molecular analysis of the transcriptional regulatory region of an early baculovirus gene. J Virol. 1989 Feb;63(2):493–503. doi: 10.1128/jvi.63.2.493-503.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  32. Pearson G. R., Luka J., Petti L., Sample J., Birkenbach M., Braun D., Kieff E. Identification of an Epstein-Barr virus early gene encoding a second component of the restricted early antigen complex. Virology. 1987 Sep;160(1):151–161. doi: 10.1016/0042-6822(87)90055-9. [DOI] [PubMed] [Google Scholar]
  33. Rabizadeh S., LaCount D. J., Friesen P. D., Bredesen D. E. Expression of the baculovirus p35 gene inhibits mammalian neural cell death. J Neurochem. 1993 Dec;61(6):2318–2321. doi: 10.1111/j.1471-4159.1993.tb07477.x. [DOI] [PubMed] [Google Scholar]
  34. Rankin C., Ooi B. G., Miller L. K. Eight base pairs encompassing the transcriptional start point are the major determinant for baculovirus polyhedrin gene expression. Gene. 1988 Oct 15;70(1):39–49. doi: 10.1016/0378-1119(88)90102-3. [DOI] [PubMed] [Google Scholar]
  35. Rao L., Debbas M., Sabbatini P., Hockenbery D., Korsmeyer S., White E. The adenovirus E1A proteins induce apoptosis, which is inhibited by the E1B 19-kDa and Bcl-2 proteins. Proc Natl Acad Sci U S A. 1992 Aug 15;89(16):7742–7746. doi: 10.1073/pnas.89.16.7742. [DOI] [PMC free article] [PubMed] [Google Scholar]
  36. Rice W. C., Miller L. K. Baculovirus transcription in the presence of inhibitors and in nonpermissive Drosophila cells. Virus Res. 1986 Nov;6(2):155–172. doi: 10.1016/0168-1702(86)90047-x. [DOI] [PubMed] [Google Scholar]
  37. Rodems S. M., Friesen P. D. The hr5 transcriptional enhancer stimulates early expression from the Autographa californica nuclear polyhedrosis virus genome but is not required for virus replication. J Virol. 1993 Oct;67(10):5776–5785. doi: 10.1128/jvi.67.10.5776-5785.1993. [DOI] [PMC free article] [PubMed] [Google Scholar]
  38. Rohrmann G. F. Baculovirus structural proteins. J Gen Virol. 1992 Apr;73(Pt 4):749–761. doi: 10.1099/0022-1317-73-4-749. [DOI] [PubMed] [Google Scholar]
  39. Serafini-Cessi F., Malagolini N., Nanni M., Dall'Olio F., Campadelli-Fiume G., Tanner J., Kieff E. Characterization of N- and O-linked oligosaccharides of glycoprotein 350 from Epstein-Barr virus. Virology. 1989 May;170(1):1–10. doi: 10.1016/0042-6822(89)90345-0. [DOI] [PubMed] [Google Scholar]
  40. Vaughn J. L., Goodwin R. H., Tompkins G. J., McCawley P. The establishment of two cell lines from the insect Spodoptera frugiperda (Lepidoptera; Noctuidae). In Vitro. 1977 Apr;13(4):213–217. doi: 10.1007/BF02615077. [DOI] [PubMed] [Google Scholar]
  41. White E., Cipriani R. Role of adenovirus E1B proteins in transformation: altered organization of intermediate filaments in transformed cells that express the 19-kilodalton protein. Mol Cell Biol. 1990 Jan;10(1):120–130. doi: 10.1128/mcb.10.1.120. [DOI] [PMC free article] [PubMed] [Google Scholar]
  42. White E., Cipriani R. Specific disruption of intermediate filaments and the nuclear lamina by the 19-kDa product of the adenovirus E1B oncogene. Proc Natl Acad Sci U S A. 1989 Dec;86(24):9886–9890. doi: 10.1073/pnas.86.24.9886. [DOI] [PMC free article] [PubMed] [Google Scholar]
  43. White E., Sabbatini P., Debbas M., Wold W. S., Kusher D. I., Gooding L. R. The 19-kilodalton adenovirus E1B transforming protein inhibits programmed cell death and prevents cytolysis by tumor necrosis factor alpha. Mol Cell Biol. 1992 Jun;12(6):2570–2580. doi: 10.1128/mcb.12.6.2570. [DOI] [PMC free article] [PubMed] [Google Scholar]
  44. Whitford M., Stewart S., Kuzio J., Faulkner P. Identification and sequence analysis of a gene encoding gp67, an abundant envelope glycoprotein of the baculovirus Autographa californica nuclear polyhedrosis virus. J Virol. 1989 Mar;63(3):1393–1399. doi: 10.1128/jvi.63.3.1393-1399.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
  45. Williams G. T., Smith C. A. Molecular regulation of apoptosis: genetic controls on cell death. Cell. 1993 Sep 10;74(5):777–779. doi: 10.1016/0092-8674(93)90457-2. [DOI] [PubMed] [Google Scholar]
  46. Zhong L. T., Sarafian T., Kane D. J., Charles A. C., Mah S. P., Edwards R. H., Bredesen D. E. bcl-2 inhibits death of central neural cells induced by multiple agents. Proc Natl Acad Sci U S A. 1993 May 15;90(10):4533–4537. doi: 10.1073/pnas.90.10.4533. [DOI] [PMC free article] [PubMed] [Google Scholar]

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