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. 1972 Aug;111(2):308–315. doi: 10.1128/jb.111.2.308-315.1972

Induction of Galactokinase in Saccharomyces cerevisiae: Kinetics of Induction and Glucose Effects

Bruce G Adams 1
PMCID: PMC251283  PMID: 4559724

Abstract

The induced synthesis of galactokinase and the repressing effects of glucose on this synthesis have been investigated in whole yeast cells rendered permeable by treatment with dimethyl sulfoxide. It was found that the induction response of uninduced cells to galactose is clearly dependent on the nature of the carbon source upon which the culture was grown prior to exposure to galactose. Glucose-grown cells exhibited a long lag before induction, whereas lactate-grown cells exhibited induced synthesis within 8 min. A concentration of 0.5% galactose was found to be optimal for induction. The addition of glucose to yeast cultures growing on galactose resulted in a severe transient repression of synthesis which was followed by a resumed rate of synthesis characteristic of a weaker permanent catabolite repression. Neither 2-deoxygalactose nor fucose acted as gratuitous inducers of the pathway, nor did they serve as a substrates for galactokinase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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