title: Antifungal activity of Saccharomyces cerevisiae peroxisomal 3-ketoacyl-CoA thiolase.
abstract: 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.
authors.affiliation: Environmental Biotechnology National Core Research Center, Gyeongsang National University, Jinju 660-701, Korea.
authors.forename: Jung Ro
authors.initials: JR
authors.lastname: Lee
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Ho Byoung
authors.initials: HB
authors.lastname: Chae
authors.forename: Ji Hyun
authors.initials: JH
authors.lastname: Jung
authors.forename: Sang Yeol
authors.initials: SY
authors.lastname: Lee
mesh_terms: D000102:Acetyl-CoA C-Acyltransferase / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D000935:Antifungal Agents / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D020675:Peroxisomes / Q000201:enzymology*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000201:enzymology; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D000935:Antifungal Agents; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; D000102:Acetyl-CoA C-Acyltransferase