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. 1992 Sep;132(1):63–73. doi: 10.1093/genetics/132.1.63

Possible Cross-Regulation of Phosphate and Sulfate Metabolism in Saccharomyces Cerevisiae

K F O'Connell 1, R E Baker 1
PMCID: PMC1205130  PMID: 1398064

Abstract

CP1 (encoded by the gene CEP1) is a sequence-specific DNA binding protein of Saccharomyces cerevisiae that recognizes a sequence element (CDEI) found in both yeast centromeres and gene promoters. Strains lacking CP1 exhibit defects in growth, chromosome segregation and methionine biosynthesis. A YEp24-based yeast genomic library was screened for plasmids which suppressed the methionine auxotrophy of a cep1 null mutant. The suppressing plasmids contained either CEP1 or DNA derived from the PH04 locus. Subcloning experiments confirmed that suppression correlated with increased dosage of PHO4. PHO4(c), pho80 and pho84 mutations, all of which lead to constitutive activation of the PHO4 transcription factor, also suppressed cep1 methionine auxotrophy. The suppression appeared to be a direct effect of PHO4, not a secondary effect of PHO regulon derepression, and was PHO2-dependent. Spontaneously arising extragenic suppressors of cep1 methionine auxotrophy were also isolated; approximately one-third of them were alleles of pho80. While PHO4 overexpression suppressed the methionine auxotrophy of a cep1 mutant, CEP1 overexpression failed to suppress the phenotype of a pho4 mutant; however, a cep1 null mutation suppressed the low inorganic phosphate growth deficiency of a pho84 mutant. The results may suggest that phosphate and sulfate metabolism are cross-regulated.

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Selected References

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