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Acta Biologica Hungarica

, Volume 57, Issue 2, pp 247–259 | Cite as

Targeting dsRNA-Specific Single-Chain Fv Antibody Fragments to Different Cellular Locations in Nicotiana Tabacum L.

  • B. Morgun
  • A. Richter
  • S. D. Deshmukh
  • V. Stepanyuk
  • Katalin Kálai
  • G. Nagy
  • L. Hufnagel
  • Noémi LukácsEmail author
Article

Abstract

Expression of antibodies or antibody fragments in plants is a useful tool for producing active antibody derivatives for diagnostic or pharmaceutical purposes as well as for immunomodulation. We investigated the effect of cellular expression site on the stability and yield of double-stranded RNA (dsRNA)-spe-cific single-chain Fv-fragments (scFv) in transgenic tobacco. Two antibodies (J2 and P6) belonging to the V23(J558) heavy chain variable gene family but differing in the light chain variable domain were used. scFvs were targeted to the cytoplasm - with or without anchoring them in the plasma membrane -, into the endoplasmic reticulum (ER) and to the apoplast. Although high mRNA concentrations were detected in all cases, scFv proteins accumulated only when scFvs were made ER-resident by appropriate signal sequences. When the ER retention signal was removed to allow scFv-secretion to the apoplast, no scFv-proteins were detected. Despite the strong homology of the VH-sequences of J2 and P6 antibodies, only P6 provided a stable scFv scaffold for intracytoplasmic expression. J2-scFv could not be stabilised either by adding a C-terminal stabilisation signal or by anchoring the protein on the cytoplasmic side of the plasma membrane (PM). It was found that dsRNA-specific J2-scFvs are active in vivo and enhance Potato Virus Y induced symptoms in infected tobacco. This is the first report describing the expression and biological effect of RNA-specific antibodies in plants.

Keywords

scFv plantibody GFP protein targeting dsRNA 

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© Akadémiai Kiadó, Budapest 2006

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • B. Morgun
    • 1
  • A. Richter
    • 2
  • S. D. Deshmukh
    • 1
  • V. Stepanyuk
    • 1
  • Katalin Kálai
    • 3
  • G. Nagy
    • 3
  • L. Hufnagel
    • 4
  • Noémi Lukács
    • 1
    • 2
    • 3
    Email author
  1. 1.Institute of Plant BiologyBiological Research CentreSzegedHungary
  2. 2.Institut für Physikalische BiologieHeinrich-Heine-UniversitätDüsseldorfFRG
  3. 3.Department of Plant Physiology and Plant BiochemistryCorvinus University of BudapestHungary
  4. 4.Department of Mathematics and InformaticsCorvinus University of BudapestHungary

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