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. 1986 Jan;165(1):101–106. doi: 10.1128/jb.165.1.101-106.1986

GAL3 gene product is required for maintenance of the induced state of the GAL cluster genes in Saccharomyces cerevisiae.

Y Nogi
PMCID: PMC214376  PMID: 3510183

Abstract

The activities of the first three enzymes for galactose catabolism normally become detectable within 15 min after the addition of galactose into a culture of the yeast Saccharomyces cerevisiae. In S. cerevisiae with a recessive mutation termed gal3, a longer-than-normal lag is observed before the appearance of the enzyme activities (O. Winge and C. Roberts, C. R. Trav. Lab. Carlsberg Ser. Physiol. 24:263-315, 1948). I isolated two S. cerevisiae mutants with temperature-sensitive defects in the GAL3 gene. Temperature shift experiments with one of those mutants led to the conclusion that the GAL3 function is required not only for the initiation of enzyme induction but also for the maintenance of the induced state in galactose-nonfermenting S. cerevisiae because of a defect in any of the genes for the galactose-catabolizing enzymes, such as gal1 or gal10. In contrast, the GAL3 function is phenotypically dispensable in galactose-metabolizing S. cerevisiae. Thus, the normal catabolism of galactose can substitute for the GAL3 function.

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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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