A genetic study of signaling processes for repression of PHO5 transcription in Saccharomyces cerevisiae.
In the yeast Saccharomyces cerevisiae, transcription of a secreted acid phosphatase, PHO5, is repressed in response to high concentrations of extracellular inorganic phosphate. To investigate the signal transduction pathway leading to transcriptional regulation of PHO5, we carried out a genetic selection for mutants that express PHO5 constitutively. We then screened for mutants whose phenotypes are also dependent on the function of PHO81, which encodes an inhibitor of the Pho80p-Pho85p cyclin/cyclin-dependent kinase complex. These mutations are therefore likely to impair upstream functions in the signaling pathway, and they define five complementation groups. Mutations were found in a gene encoding a plasma membrane ATPase (PMA1), in genes required for the in vivo function of the phosphate transport system (PHO84 and PHO86), in a gene involved in the fatty acid synthesis pathway (ACC1), and in a novel, nonessential gene (PHO23). These mutants can be classified into two groups: pho84, pho86, and pma1 are defective in high-affinity phosphate uptake, whereas acc1 and pho23 are not, indicating that the two groups of mutations cause constitutive expression of PHO5 by distinct mechanisms. Our observations suggest that these gene products affect different aspects of the signal transduction pathway for PHO5 repression.
Lau
W W
WW
Program in Biophysics, School of Medicine, University of California, San Francisco, California 94143, USA.
Schneider
K R
KR
O'Shea
E K
EK
D000123:Acetyltransferases / Q000235:genetics; D000135:Acid Phosphatase / Q000235:genetics*; D033942:Adaptor Proteins, Vesicular Transport; D000483:Alleles; D002352:Carrier Proteins; D005227:Fatty Acids / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic; D015966:Gene Expression Regulation, Fungal; D006863:Hydrogen-Ion Concentration; D008565:Membrane Proteins / Q000235:genetics; D016296:Mutagenesis; D010641:Phenotype; D010710:Phosphates / Q000378:metabolism; D006180:Proton-Translocating ATPases / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D015398:Signal Transduction; D014158:Transcription, Genetic
D033942:Adaptor Proteins, Vesicular Transport; D002352:Carrier Proteins; D005227:Fatty Acids; D005656:Fungal Proteins; D008565:Membrane Proteins; C099982:PHO86 protein, S cerevisiae; C434364:PMA2 protein, S cerevisiae; D010710:Phosphates; D029701:Saccharomyces cerevisiae Proteins; D000123:Acetyltransferases; C055210:aminoglycoside N1-acetyltransferase; D000135:Acid Phosphatase; C092477:PMA1 protein, S cerevisiae; D006180:Proton-Translocating ATPases