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. 1995 Dec;177(23):6836–6843. doi: 10.1128/jb.177.23.6836-6843.1995

Regulation of nuclear genes encoding mitochondrial proteins in Saccharomyces cerevisiae.

T A Brown 1, C Evangelista 1, B L Trumpower 1
PMCID: PMC177551  PMID: 7592476

Abstract

Selection for mutants which release glucose repression of the CYB2 gene was used to identify genes which regulate repression of mitochondrial biogenesis. We have identified two of these as the previously described GRR1/CAT80 and ROX3 genes. Mutations in these genes not only release glucose repression of CYB2 but also generally release respiration of the mutants from glucose repression. In addition, both mutants are partially defective in CYB2 expression when grown on nonfermentable carbon sources, indicating a positive regulatory role as well. ROX3 was cloned by complementation of a glucose-inducible flocculating phenotype of an amber mutant and has been mapped as a new leftmost marker on chromosome 2. The ROX3 mutant has only a modest defect in glucose repression of GAL1 but is substantially compromised in galactose induction of GAL1 expression. This mutant also has increased SUC2 expression on nonrepressing carbon sources. We have also characterized the regulation of CYB2 in strains carrying null mutation in two other glucose repression genes, HXK2 and SSN6, and show that HXK2 is a negative regulator of CYB2, whereas SSN6 appears to be a positive effector of CYB2 expression.

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Selected References

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