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. 1990 Jan;124(1):39–55. doi: 10.1093/genetics/124.1.39

Consequences of Growth Media, Gene Copy Number, and Regulatory Mutations on the Expression of the Prb1 Gene of Saccharomyces Cerevisiae

C M Moehle 1, E W Jones 1
PMCID: PMC1203908  PMID: 2407604

Abstract

Glucose represses PRB1 expression at the level of transcription. However, release from glucose repression initially does not result in accumulation of protease B (PrB) activity despite transcriptional derepression. PrB activity accumulates only upon a second transcriptional derepression as the cells approach stationary phase. Increasing the PRB1 gene dosage on 2μ-based plasmids does not overcome glucose repression. Glucose-mediated repression of PRB1 is not subject to the same genetic controls as SUC2. Mutation of the HXK2 gene, which confers glucose-insensitive expression of secreted invertase, had no effect on PRB1 expression at the level of PrB activity. Strains bearing a mutation in any of the SNF1-SNF6 genes cannot derepress secreted invertase synthesis, but did derepress PrB synthesis when grown in the absence of glucose. Mutation of the SNF2 or SNF5 gene led to accumulation of PrB activity to levels ten times that of wild type. Polymorphism for a suppressor gene was observed: in snf5-bearing strains, one allele of this suppressor gene resulted in elevated levels of PrB and the other allele resulted in wild-type levels of PrB; neither allele suppressed the Suc(-) phenotype of the snf5 mutant. Re-examination of published data on SUC2 expression in snf2 and snf5 mutants and examination of PRB1 expression in these mutants paradoxically suggest that the SNF2 and SNF5 gene products might act as negative regulators of gene expression.

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Selected References

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