Phenotypes and fed-batch fermentation of ubiquinone-overproducing fission yeast using ppt1 gene.
Ubiquinone (UQ), a component of the electron transfer system in many organisms, has been widely used for pharmaceuticals and cosmetics. In this study, we cloned and overexpressed the full-length ppt1 (MTppt1) gene, which encodes p-hydroxybenzoate:polyprenyltransferase and ERppt1 gene, which was modified to be localized on endoplasmic reticulum in fission yeast. The yeast MTppt1 and ERppt1 transgenic lines showed about 3.7 and 5.1 times increment in UQ content and the recombinant yeasts with a higher UQ level are more resistant to H(2)O(2), Cu(2+) and NaCl, and interestingly their growth was also faster than the wild type at lower temperature. For large-scale cultivation, the direct feedback control of glucose using an on-line ethanol concentration monitor for ubiquinone production of yeast ERppt1 by high-cell-density fermentation was investigated and the fermentation parameters (e.g., dissolved oxygen, pH, ethanol concentration, oxygen uptake rate, carbon dioxide evolution rate and respiration quotient) were also discussed. After 90 h cultures, the yeast dry cell weight reached 57 gl(-1) and the ubiquinone yield reached 23 mgl(-1). In addition, plasmid stability was maintained at high level throughout the fermentation.
Zhang
Dawei
D
Beijing Key Lab of Bioprocess, College of Biology Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
Shrestha
Binaya
B
Niu
Weining
W
Tian
Pingfang
P
Tan
Tianwei
T
D018533:Biomass; D019149:Bioreactors; D004721:Endoplasmic Reticulum / Q000502:physiology; D005285:Fermentation; D015966:Gene Expression Regulation, Fungal; D018384:Oxidative Stress / Q000502:physiology; D010749:Phosphoprotein Phosphatases / Q000235:genetics* / Q000378:metabolism; D010957:Plasmids; D012440:Saccharomyces / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics* / Q000378:metabolism; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics* / Q000378:metabolism; D014451:Ubiquinone / Q000096:biosynthesis*
D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; D014451:Ubiquinone; C089640:PPT1 protein, S cerevisiae; D010749:Phosphoprotein Phosphatases