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Applied Microbiology and Biotechnology

, Volume 99, Issue 16, pp 6765–6774 | Cite as

Expression of enterovirus 71 virus-like particles in transgenic enoki (Flammulina velutipes)

  • Yu-Ju Lin
  • Wen-Ti Liu
  • Holger StarkEmail author
  • Ching-Tsan HuangEmail author
Applied genetics and molecular biotechnology

Abstract

No commercial vaccines are currently available for enterovirus 71 (EV71) infection. Oral virus-like particle (VLP) vaccines are regarded as a better choice for prevention from food-borne diseases compared with injected whole virus vaccines. Unfortunately, the application of oral VLP vaccines produced from transgenic plants was limited due to the concerns of gene contamination. Alternatively, using transgenic mushrooms retains the advantages of transgenic plants and tremendously reduce risks of gene contamination. Polycistronic expression vectors harboring the glyceraldehyde-3-phospho-dehydrogenase promoter to codrive EV71 structural protein P1 and protease 3C using the 2A peptide of porcine teschovirus-1 were constructed and introduced into Flammulina velutipes via Agrobacterium tumefaciens-mediated transformation. The analyses of the genomic PCR, Southern blotting, and RT-PCR showed that the genes of P1 and 3C were integrated into the chromosomal DNA through a single insertion, and their resulting mRNAs were transcribed. The Western blotting analysis combined with LC-MS/MS demonstrated that EV71 VLPs were composed of the four subunit proteins digested from P1 polyprotein by 3C protease. Through the use of a single particle electron microscope, images of 1705 particles with diameter similar to the EV71 viron were used for 3D reconstruction. Protrusions were observed on the surface in the 2D class averages, and a 3D reconstruction of the VLPs was obtained. In conclusion, EV71 VLPs were successfully produced in transgenic F. velutipes using a polycistronic expression strategy, which indicates that this approach is promising for the development of oral vaccines produced in mushrooms.

Keywords

Flammulina velutipes Agrobacterium tumefaciens-mediated transformation 2A peptides Polycistron Enterovirus 71 

Notes

Acknowledgments

We are grateful to TechComm (College of Life Science, National Taiwan University) for LC-MS/MS technical assistance. The financial support of the National Science Council of the ROC (Grant No. NSC102-2313-B-002-059) is greatly appreciated.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Department of Biochemical Science and TechnologyNational Taiwan UniversityTaipeiTaiwan
  2. 2.Max Planck Institute for Biophysical ChemistryGoettingenGermany

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