Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Expression of Fungal Phytase on the Cell Surface of Saccharomyces cerevisiae

  • Mo, Ae-Young (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • Park, Seung-Moon (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • Kim, Yun-Sik (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • Yang, Moon-Sik (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University) ;
  • Kim, Dae-Hyuk (Institute for Molecular Biology and Genetics, Basic Science Research Institute, Chonbuk National University)
  • Published : 2005.12.31
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Abstract

Phytase improves the bioavailability of phytate phosphorus in plant foods to humans and animals, and reduces the phosphorus pollution of animal waste. We have engineered the cell surface of the yeast. Saccharomyces cerevisiae, by anchoring active fungal phytase on its cell wall, in order to apply it as a dietary supplement containing bioconversional functions in animal foods and a whole cell bio-catalyst for the treatment of waste. The phytase gene (phyA) of Aspergillus niger with a signal peptide of rice amylase 1A (Ramy1A) was fused with the gene encoding the C-terminal half (320 amino acid residues from the C-terminus) of yeast ${\alpha}-agglutinin$, a protein which is involved in mating and is covalently anchored to the cell wall. The resulting fusion construct was introduced into S. cerevisiae and expressed under the control of the constitutive glyceraldehydes-3-phosphate dehydrogenase (GPD) promoter. Phytase plate assay revealed that the surface-engineered cell exhibited a catalytically active opaque zone which was restricted to the margin of the colony. Additionally, the phytase activity was detected in the cell fraction, but was not detected in the culture medium when it was grown in liquid. These results indicate that the phytase was successfully anchored to the cell surface of yeast and was displayed as its active form. The amount of recombinant phytase on the surface of yeast cells was estimated to be 16,000 molecules per cell.

Keywords

References

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