Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Heterologous Gene Expression System Using the Cold-Inducible CnAFP Promoter in Chlamydomonas reinhardtii

  • Kim, Minjae (Department of Life Science, Research Institute for Natural Sciences, Hanyang University) ;
  • Kim, Jongrae (Department of Life Science, Research Institute for Natural Sciences, Hanyang University) ;
  • Kim, Sanghee (Division of Polar Life Science, Korea Polar Research Institute, Korea Institute of Ocean Science and Technology) ;
  • Jin, EonSeon (Department of Life Science, Research Institute for Natural Sciences, Hanyang University)
  • Received : 2020.07.20
  • Accepted : 2020.08.14
  • Published : 2020.11.28
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Abstract

To increase the availability of microalgae as producers of valuable compounds, it is necessary to develop novel systems for gene expression regulation. Among the diverse expression systems available in microalgae, none are designed to induce expression by low temperature. In this study, we explored a cold-inducible system using the antifreeze protein (AFP) promoter from a polar diatom, Chaetoceros neogracile. A vector containing the CnAFP promoter (pCnAFP) was generated to regulate nuclear gene expression, and reporter genes (Gaussia luciferase (GLuc) and mVenus fluorescent protein (mVenus)) were successfully expressed in the model microalga, Chlamydomonas reinhardtii. In particular, under the control of pCnAFP, the expression of these genes was increased at low temperature, unlike pAR1, a promoter that is widely used for gene expression in C. reinhardtii. Promoter truncation assays showed that cold inducibility was still present even when pCnAFP was shortened to 600 bp, indicating the presence of a low-temperature response element between -600 and -477 bp. Our results show the availability of new heterologous gene expression systems with cold-inducible promoters and the possibility to find novel low-temperature response factors in microalgae. Through further improvement, this cold-inducible promoter could be used to develop more efficient expression tools.

Keywords

References

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