Occurrence of cytochrome P450 in continuous cultures of Saccharomyces cerevisiae

  • M. Trinn
  • O. Käppeli
  • A. Fiechter


Cytochrome P450 of Saccharomyces cerevisiae is an inducible enzyme system. Hitherto, its induction was related to semi-anaerobic culture conditions and high glucose concentrations in the growth medium respectively. Since glucose and oxygen are main regulatory effectors in this yeast, the relationship between the occurrence of cytochrome P450 and these two effectors was established in continuous culture. At glucose-derepressed conditions it was not possible to induce the formation of cytochrome P450 by oxygen limitation alone. The oxygen supply had to be decreased to a level where glucose repression also became active. At glucose-repressed conditions cytochrome P450 was obtained in good yield (3 to 5 pmol per mg dry cell weight) below a dissolved oxygen tension of appproximately 15%. There was a correlation between the content of mitochondrial cytochromes and that of cytochrome P450. The presence of mitochondrial cytochromes was reciprocal with cytochrome P450 when its content was increased by lowering the dissolved oxygen tension.


Dissolve Oxygen Glucose Concentration Saccharomyces Cerevisiae High Glucose Oxygen Supply 
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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • M. Trinn
    • 1
  • O. Käppeli
    • 1
  • A. Fiechter
    • 1
  1. 1.Institute of BiotechnologySwiss Federal Institute of TechnologyZürichSwitzerland

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