| Autor: |
Maris, Antonius J.A., Bakker, Barbara M, Brandt, Michael, Boorsma, André, Teixeira de Mattos, M.Joost, Grivell, Leslie A, Pronk, Jack T, Blom, Jolanda |
| Zdroj: |
FEMS Yeast Research; July 2001, Vol. 1 Issue: 2 p139-149, 11p |
| Abstrakt: |
The tendency of Saccharomyces cerevisiaeto favor alcoholic fermentation over respiration is a complication in aerobic, biomass‐directed applications of this yeast. Overproduction of Hap4p, a positive transcriptional regulator of genes involved in respiratory metabolism, has been reported to positively affect the balance between respiration and fermentation in aerobic glucose‐grown batch cultures. In this study, the effects of HAP4overexpression have been quantified in the prototrophic S. cerevisiaestrain CEN.PK 113‐7D under a variety of growth conditions. In aerobic glucose‐limited chemostat cultures, overexpression of HAP4increased the specific growth rate at which aerobic fermentation set in by about 10% relative to the isogenic wild‐type. Upon relief of glucose‐limited conditions, the HAP4‐overexpressing strain produced slightly less ethanol than the wild‐type strain. The effect of Hap4p overproduction was most drastic in aerobic, glucose‐grown chemostat cultures in which ammonium was limiting. In such cultures, the biomass yield on glucose was double that of the wild‐type. |
| Databáze: |
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