Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Soluble Expression of Recombinant Olive Flounder Hepcidin I Using a Novel Secretion Enhancer

  • Lee, Sang Jun (Biotechnology Research Institute, National Fisheries Research and Development Institute) ;
  • Park, In Suk (Biotechnology Research Institute, National Fisheries Research and Development Institute) ;
  • Han, Yun Hee (Biotechnology Research Institute, National Fisheries Research and Development Institute) ;
  • Kim, Young Ok (Biotechnology Research Institute, National Fisheries Research and Development Institute) ;
  • Reeves, Peter R. (Department of Microbiology, University of Sydney)
  • Received : 2007.10.30
  • Accepted : 2008.02.19
  • Published : 2008.08.31
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Abstract

Expression of olive flounder hepcidin I (HepI) fused with truncated OmpA signal peptides ($OmpASP_{tr}$) as directional signals does not produce soluble fusion proteins. However, by inserting amino acid segments (xxx) varying in pI and hydrophobicity/hydrophilicity into a leader sequence containing a truncated OmpASP ($OmpASP_{tr}$) and a factor Xa cleavage site (Xa) [$OmpASP_{tr}{\mid}(xxx){\mid}Xa$], we were able in some cases to express soluble recombinant HepI. Soluble expression of the recombinant protein strongly correlated with (xxx) insertions of high pI and hydrophilicity. Therefore, we modified the $OmpASP_{tr}{\mid}(xxx){\mid}Xa$ sequence by inserting Arg and Lys into (xxx) to increase the hydrophilicity of the signal peptide region. These modifications enhanced the expression of soluble recombinant HepI. Hydropathic profile analysis of the $OmpASP_{tr}{\mid}(xxx){\mid}Xa$ HepI fusion proteins revealed that the transmembrane-like domains derived from the $OmpASP_{tr}{\mid}(xxx){\mid}Xa$ sequence were larger than the internal positively charged domain native to HepI. It should therefore be possible to overcome the obstacle of internal positively charged domains to obtain soluble expression of recombinant proteins by monitoring the hydrophilicity and hydropathic profile of the signal peptide region using a computer program.

Keywords

Acknowledgement

Supported by : National Fisheries Research and Development Institute

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