Molecular Biotechnology

, 43:243 | Cite as

Potato Virus X Coat Protein Fusion to Human Papillomavirus 16 E7 Oncoprotein Enhance Antigen Stability and Accumulation in Tobacco Chloroplast

  • Mauro Morgenfeld
  • María Eugenia Segretin
  • Sonia Wirth
  • Ezequiel Lentz
  • Alicia Zelada
  • Alejandro Mentaberry
  • Lutz Gissmann
  • Fernando Bravo-Almonacid


Cervical cancer linked to infection with human papillomavirus (HPV) is the third cause of cancer-related death in women. As the virus cannot be propagated in culture, vaccines have been based on recombinant antigens with inherited high-cost production. In a search of alternative cheap production system, E7 HPV type 16 protein, an attractive candidate for anticancer vaccine development, was engineered to be expressed in tobacco chloroplast. In addition, E7 coding sequence was fused to potato virus X coat protein (CP) to compare expression level. Results show that E7CP transcript accumulation reached lower levels than non-fused E7. However, antigen expression levels were higher for fusion protein indicating that CP stabilizes E7 peptide in the chloroplast stroma. These results support viability of transplastomic plants for antigen production and the relevance of improving recombinant peptide stability for certain transgenes to enhance protein accumulation in this organelle.


Human papillomavirus (HPV) E7 antigen Fusion protein Chloroplast transformation Transplastomic tobacco Molecular farming 


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Copyright information

© Humana Press 2009

Authors and Affiliations

  • Mauro Morgenfeld
    • 1
    • 2
  • María Eugenia Segretin
    • 1
    • 2
  • Sonia Wirth
    • 1
    • 2
  • Ezequiel Lentz
    • 1
  • Alicia Zelada
    • 1
    • 2
  • Alejandro Mentaberry
    • 1
    • 2
  • Lutz Gissmann
    • 3
  • Fernando Bravo-Almonacid
    • 1
  1. 1.Instituto de Ingeniería Genética y Biología Molecular (INGEBI-CONICET)Ciudad Autónoma de Buenos AiresArgentina
  2. 2.Departamento de Fisiología Biología Molecular y Celular (FCEN-UBA)Ciudad Universitaria, Buenos AiresArgentina
  3. 3.Department of Genome Modifications and CarcinogenesisGerman Cancer Research CenterHeidelbergGermany

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