Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Spore Inoculum Optimization to Maximize Cyclosporin A Production in Tolypocladium niveum

  • Lee, Mi-Jin (Department of Biological Engineering, Inha University) ;
  • Lee, Han-Na (Department of Biological Engineering, Inha University) ;
  • Han, Kyu-Boem (Hanson Biotech Co., Ltd.) ;
  • Kim, Eung-Soo (Department of Biological Engineering, Inha University)
  • Published : 2008.05.31
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Abstract

The cyclic undecapeptide, cyclosporin A (CyA), is one of the most commonly prescribed immunosuppressive drugs. It is generated nonribosomally from a multifunctional cyclosporin synthetase enzyme complex by the filamentous fungus Tolypocladium niveum. In order to maximize the production of CyA by wild-type T. niveum (ATCC 34921), each of three culture stages (sporulation culture, growth culture, and production culture) were sequentially optimized. Among the three potential sporulation media, the SSMA medium generated the highest numbers of T. niveum spores. The SSM and SM media were then selected as the optimal growth and production culture media, respectively. The addition of valine and fructose to the SM production medium was also determined to be crucial for CyA biosynthesis. In this optimized three-stage culture system, 3% of the spore inoculum generated the highest level of CyA productivity in a 15-day T. niveum production culture, thereby implying that the determination of an appropriate size of T. niveum spore inoculum plays a critical role in the maximization of CyA production.

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