Antifungal activity of Saccharomyces cerevisiae peroxisomal 3-ketoacyl-CoA thiolase

  • Lee, Jung-Ro (Environmental Biotechnology National Core Research Center, Gyeongsang National University) ;
  • Kim, Sun-Young (Environmental Biotechnology National Core Research Center, Gyeongsang National University) ;
  • Chae, Ho-Byoung (Environmental Biotechnology National Core Research Center, Gyeongsang National University) ;
  • Jung, Ji-Hyun (Environmental Biotechnology National Core Research Center, Gyeongsang National University) ;
  • Lee, Sang-Yeol (Environmental Biotechnology National Core Research Center, Gyeongsang National University)
  • Published : 2009.05.31


Peroxisomes play an important role in cellular defense systems and generate secondary messengers for cellular communication. Saccharomyces cerevisiae containing oleate-induced peroxisomes were subjected to buffer-soluble extraction and two chromatographic procedures, and a protein with antifungal activity was isolated. The results of MALDI-TOF analysis identified the isolated protein as peroxisomal 3-ketoacyl-CoA thiolase (ScFox3). Purified yeast ScFox3 exhibited thiolase activity that catalyzed the thiolytic cleavage of 3-ketoacyl-CoA to acetyl-CoA and acyl-CoA. ScFox3 protein inhibited various pathogenic fungal strains, with the exception of Aspergillus flavus. Using ScFox3-GFP and PTS2 signal-truncated ScFox3M-GFP, we showed that only ScFox3-GFP, with an intact PTS2 peroxisome signal sequence, was able to translocate into peroxisomes. Yeast ScFox3 is a natural antifungal agent found in peroxisomes.


Antifungal activity;Hemolytic activity;Saccharomyces cerevisiae;ScFox3;Thiolase activity


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