Gilliquet V, Legrain M, Berben G, Hilger F

Unite de Microbiologie, Faculte des Sciences Agronomiques, Gembloux Belgium.

The negative regulatory genes, PHO80 and PHO85, involved in transcriptional regulation of the yeast repressible acid-phosphatase-encoding gene, PHO5, have been cloned. Expression of PHO80 and PHO85 has been studied by means of lacZ fusions. We show here that these expressions are inorganic phosphate (Pi) independent and that they are controlled by the PHO80 gene product; moreover, PHO80 expression is controlled by PHO85. We also present genetic evidence for an interaction between the PHO80 and PHO85 proteins: increased PHO85 gene dosage partially compensates for the pho80-1 mutation and this effect is allele-specific. The pho80-1 allele has been cloned and sequenced. The mutation changes Gly229 to Asp. This region was shown to be essential for PHO80 function by C-terminal deletion analysis.

Mesh Terms:
Acid Phosphatase, Amino Acid Sequence, Base Sequence, Cloning, Molecular, Cyclin-Dependent Kinases, Cyclins, Fungal Proteins, Gene Expression Regulation, Fungal, Genes, Fungal, Genes, Regulator, Molecular Sequence Data, Mutation, Phosphates, Plasmids, Repressor Proteins, Restriction Mapping, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Transcription, Genetic

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