Abstract
The steady-state residual glucose concentrations in aerobic chemostat cultures of Saccharomyces cerevisiae ATCC 4126, grown in a complex medium, increased sharply in the respiro-fermentative region, suggesting a large increase in the apparent ks value. By contrast, strain CBS 8066 exhibited much lower steady-state residual glucose concentrations in this region. Glucose transport assays were conducted with these strains to determine the relationship between transport kinetics and sugar assimilation. With strain CBS 8066, a high-affinity glucose uptake system was evident up to a dilution rate of 0.41 h−1, with a low-affinity uptake system and high residual glucose levels only evident at the higher dilution rates. With strain ATCC 4126, the high-affinity uptake system was present up to a dilution rate of about 0.38 h−1, but a low-affinity uptake system was discerned already from a dilution rate of 0.27 h−1, which coincided with the sharp increase in the residual glucose concentration. Neither of the above yeast strains had an absolute vitamin requirement for aerobic growth. Nevertheless, in the same medium supplemented with vitamins, no low-affinity uptake system was evident in cells of strain ATCC 4126 even at high dilution rates and the steady-state residual glucose concentration was much lower. The shift in the relative proportions of the high and low-affinity uptake systems of strain ATCC 4126, which might have been mediated by an inositol deficiency through its effect on the cell membrane, may offer an explanation for the unusually high steady-state residual glucose concentrations observed at dilution rates above 52% of the wash-out dilution rate.
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du Preez, J.C., de Kock, S.H., Kilian, S.G. et al. The relationship between transport kinetics and glucose uptake by Saccharomyces cerevisiae in aerobic chemostat cultures. Antonie Van Leeuwenhoek 77, 379–388 (2000). https://doi.org/10.1023/A:1002744100953
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DOI: https://doi.org/10.1023/A:1002744100953