Using Vectors Derived from Tomato Bushy Stunt Virus (TBSV) and TBSV Defective Interfering RNAs (DIs)

Wenping Qiu1, Herman B. Scholthof2

1 Department of Agriculture, Missouri State University at Mountain Grove, Mountain Grove, 2 Department of Plant Pathology and Microbiology, Texas A&M University, College Station
Publication Name:  Current Protocols in Microbiology
Unit Number:  Unit 16I.4
DOI:  10.1002/9780471729259.mc16i04s7
Online Posting Date:  November, 2007
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Abstract

This unit describes principles and protocols for expressing a gene of interest in plant cells using gene vectors that are derived from an infectious full‐length cDNA plasmid of the tomato bushy stunt virus (TBSV) genomic RNA, and from defective interfering RNAs (DIs). The TBSV gene vector system permits convenient cloning, allows modification and abundant expression of the gene of interest, and facilitates biosecure containment of the gene vectors. These vectors can be employed for functional genomics studies and for analyzing the biochemical properties and subcellular distribution of expressed RNAs and/or their cognate proteins. As with other plant virus gene vectors, recombination and deletion of the gene of interest during virus multiplication limits the application of the TBSV gene vectors to the inoculated cells or leaves. Curr. Protoc. Microbiol. 7:16I.4.1‐16I.4.16. © 2007 by John Wiley & Sons, Inc.

Keywords: tomato bushy stunt virus; defective interfering RNAs; gene vectors; gene of interest

     
 
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Table of Contents

  • Introduction
  • Strategic Planning
  • Basic Protocol 1: Cloning into the Expression Plasmids
  • Alternate Protocol 1: DNA‐Based TBSV Gene Vectors
  • Alternate Protocol 2: DI as a Gene Vector for RNAi
  • Reagents and Solutions
  • Commentary
  • Literature Cited
  • Figures
  • Tables
     
 
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Materials

Basic Protocol 1: Cloning into the Expression Plasmids

  Materials
  • TBSV gene vector (pHST2) DNA (can be obtained from the authors at http://scholthoflab.tamu.edu)
  • E. coli DH5α competent cells
  • LB medium containing 50 to 100 µg/ml ampicillin ( appendix 4A)
  • Column‐based plasmid purification kit (e.g., QIAprep Spin Miniprep kit; Qiagen)
  • Gene‐of‐interest DNA fragment
  • Restriction endonucleases XhoI, SacI, and SnaBI (and other restriction enzymes as needed) and corresponding buffers
  • Forward and reverse PCR primers for gene of interest (see Kramer and Coen, )
  • PfuUltraII Fusion HS DNA polymerase (Stratagene, cat. no. 600670; optional)
  • Klenow fragment of DNA polymerase I
  • Plasmid harboring Kanr gene (e.g., pKAN‐2 or Gateway pENTR)
  • 1% agarose gel prepared in TBE buffer (Voytas, )
  • TE buffer ( appendix 2A)
  • 50 U/µl T7 RNA polymerase (Invitrogen, cat. no. 18033‐19) and 5× T7 buffer
  • 100 mM dithiothreitol (DTT)
  • 10 mM NTP mix (Invitrogen, cat. no. 18109‐017)
  • RNAsin ribonuclease inhibitor (Promega)
  • RNA inoculation buffer (see recipe)
  • Nicotiana benthamiana plants
  • Climate‐controlled growth chambers (Conviron; http://www.conviron.com)
  • Additional reagents and equipment for transformation of E. coli (Seidman et al., ), plasmid DNA isolation (Engebrecht et al., ), polymerase chain reaction (PCR; Kramer and Coen, ), insertion of DNA fragments into plasmids (Struhl, ), use of Klenow fragment of DNA polymerase I to generate blunt ends (Tabor et al., ), phenol/chloroform extraction and ethanol precipitation of DNA (Moore and Dowhan, ), agarose gel electrophoresis (Voytas, ), spectrophotometric quantitation of nucleic acids (Gallagher and Desjardins, ), and inoculation of RNA transcripts into whole plants (unit 16.1 in this manual)
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Figures

Videos

Literature Cited

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   Desvoyes, B. and Scholthof, H.B. 2002. Host‐dependent recombination of a Tomato bushy stunt virus coat protein mutant yields truncated capsid subunits that form virus‐like complexes which benefit systemic spread. Virology 304:434‐442.
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   Hull, R. and Matthews, R.E. 2001. Matthews' Plant Virology. Academic Press, New York.
   Joelson, T., Akerblom, L., Oxelfelt, P., Strandberg, B., Tomenius, K., and Morris, T.J. 1997. Presentation of a foreign peptide on the surface of tomato bushy stunt virus. J. Gen. Virol. 78:1213‐1217.
   Kimple, M.E. and Sondek, J. 2004. Overview of affinity tags for protein purification. Curr. Protoc. Protein Sci. 36:9.9.1‐9.9.19.
   Knorr, D.A., Mullin, R.H., Hearne, P.Q., and Morris, T.J. 1991. De novo generation of defective interfering RNAs of tomato bushy stunt virus by high multiplicity passage. Virology 181:193‐202.
   Kramer, M.F. and Coen, D.M. 2001. The polymerase chain reaction. Curr. Protoc. Mol. Biol. 56:15.1.1‐15.1.14.
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   Qiu, W.P., Park, J.‐W., Jackson, A.O., and Scholthof, H.B. 2001. Retention of a small replicase gene segment in Tomato bushy stunt virus defective RNAs inhibits their helper‐mediated trans‐accumulation. Virology 281:51‐60.
   Qiu, W.P., Park, J.‐W., and Scholthof, H.B. 2002. Tombusvirus P19‐mediated suppression of virus induced gene silencing is controlled by genetic and dosage features that influence pathogenicity. Mol. Plant‐Microbe Interact. 15:269‐280.
   Qiu, W.P. and Scholthof, K.‐B.G. 2004. Satellite panicum mosaic virus capsid protein elicits symptoms on a nonhost plant and interferes with a suppressor of virus‐induced gene silencing. Mol. Plant‐Microbe Interact. 17:263‐271.
   Qu, F. and Morris, T.J. 2002. Efficient infection of Nicotiana benthamiana by Tomato bushy stunt virus is facilitated by the coat protein and maintained by p19 through suppression of gene silencing. Mol. Plant‐Microbe Interact. 15:193‐202.
   Rubio, T., Borja, M., Scholthof, H.B., Feldstein, P.A., Morris, T.J., and Jackson, A.O. 1999. Broad‐spectrum protection against Tombusviruses elicited by defective interfering RNAs in transgenic plants. J. Virol. 73:5070‐5078.
   Russo, M., Burgyan, J., and Martelli, G.P. 1994. Molecular biology of Tombusviridae. Adv. Virus Res. 44:381‐428.
   Scholthof, H.B. 1999. Rapid delivery of foreign genes into plants by direct rub‐inoculation with intact plasmid DNA of a tomato bushy stunt virus gene vector. J. Virol. 73:7823‐7829.
   Scholthof, H.B., Morris, T.J., and Jackson, A.O. 1993. The capsid protein gene of tomato bushy stunt virus is dispensable for systemic movement and can be replaced for localized expression of foreign genes. Mol. Plant‐Microbe Interact. 6:309‐322.
   Scholthof, H.B., Scholthof, K.‐B.G., and Jackson, A.O. 1996. Plant virus gene vectors for transient expression of foreign proteins in plants. Annu. Rev. Phytopathol. 34:299‐323.
   Scholthof, K.‐B.G., Mirkov, T.E., and Scholthof, H.B. 2002. Plant virus gene vectors: Biotechnology applications in agriculture and medicine. Genet. Eng (NY) 24:67‐85.
   Seidman, C.E., Struhl, K., Sheen, J., and Jessen, T. 1997. Introduction of plasmid DNA into cells. Curr. Protoc. Mol. Biol. 37:1.8.1‐1.8.10.
   Sit, T.L., Vaewhongs, A.A., and Lommel, S.A. 1998. RNA‐mediated trans‐activation of transcription from a viral RNA. Science 281:829‐832.
   Struhl, K. 1991. Subcloning of DNA fragments. Curr. Protoc. Mol. Biol. 13:3.16.1‐3.16.2.
   Tabor, S., Struhl, K., Scharf, S.J., and Gelfand, D.H. 1997. DNA‐dependent DNA polymerases. Curr. Protoc. Mol. Biol. 37:3.5.1‐3.5.15.
   Turina, M., Omarov, R.T., Murphy, J.F., Bazaldua‐Hernandez, C., Desvoyes, B., and Scholthof, H.B. 2003. A newly identified role for Tomato bushy stunt virus P19 in short distance spread. Mol. Plant Pathology 4:67‐72.
   Voytas, D. 2000. Agarose gel electrophoresis. Curr. Protoc. Mol. Biol. 51:2.5A.1‐2.5A.9.
   White, K.A., and Morris, T.J. 1999. Defective and defective interfering RNAs of monopartite plus‐strand RNA plant viruses. In Current Topics in Microbiology and Immunology: Satellites and Defective RNAs (P.K. Vogt and A.O. Jackson eds.) pp. 1‐17. Springer, New York.
   Zhang, G., Leung, C., Murdin, L., Rovinski, B., and White, K.A. 2000. In planta expression of HIV‐1 p24 protein using an RNA plant virus‐based expression vector. Mol. Biotechnology 14:99‐107.
Key References
   Scholthof, 1999. See above.
  Describes features and methodology of DNA‐based TBSV gene vectors pHST12 and pHST34.
   Scholthof, et al. 1996. See above.
  A detailed review on background, principles, and application of virus gene vectors.
   Qiu, et al. 2002. See above.
  Presents an example of using TBSV gene vectors to induce silencing, allowing for functional studies of coexpressed suppressor protein.
   Hou and Qiu, 2003. See above.
  A case study of applying both TBSV and defective interfering RNA (DI) as gene vectors in gene‐silencing research.
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