Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Generation and Expression in Plants of a Single-Chain Variable Fragment Antibody Against the Immunodominant Membrane Protein of Candidatus Phytoplasma Aurantifolia

  • Shahryari, F. (Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares University) ;
  • Safarnejad, M.R. (Department of Microbial Biotechnology and Biosafety, Agricultural Biotechnology Research Institute) ;
  • Shams-Bakhsh, M. (Department of Plant Pathology, Faculty of Agriculture, Tarbiat Modares University) ;
  • Schillberg, S. (Fraunhofer Institute for Molecular Biology and Applied Ecology (IME)) ;
  • Nolke, G. (Fraunhofer Institute for Molecular Biology and Applied Ecology (IME))
  • Received : 2013.01.21
  • Accepted : 2013.03.22
  • Published : 2013.08.28
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Abstract

Witches' broom of lime is a disease caused by Candidatus Phytoplasma aurantifolia, which represents the most significant global threat to the production of lime trees (Citrus aurantifolia). Conventional disease management strategies have shown little success, and new approaches based on genetic engineering need to be considered. The expression of recombinant antibodies and fragments thereof in plant cells is a powerful approach that can be used to suppress plant pathogens. We have developed a single-chain variable fragment antibody (scFvIMP6) against the immunodominant membrane protein (IMP) of witches' broom phytoplasma and expressed it in different plant cell compartments. We isolated scFvIMP6 from a naïve scFv phage display library and expressed it in bacteria to demonstrate its binding activity against both recombinant IMP and intact phytoplasma cells. The expression of scFvIMP6 in plants was evaluated by transferring the scFvIMP6 cDNA to plant expression vectors featuring constitutive or phloem specific promoters in cassettes with or without secretion signals, therefore causing the protein to accumulate either in the cytosol or apoplast. All constructs were transiently expressed in Nicotiana benthamiana by agroinfiltration, and antibodies of the anticipated size were detected by immunoblotting. Plant-derived scFvIMP6 was purified by affinity chromatography, and specific binding to recombinant IMP was demonstrated by enzyme-linked immunosorbent assay. Our results indicate that scFvIMP6 binds with high activity and can be used for the detection of Ca. Phytoplasma aurantifolia and is also a suitable candidate for stable expression in lime trees to suppress witches' broom of lime.

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References

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