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PMID:3915785
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| Citation |
Lemire, JM, Willcocks, T, Halvorson, HO and Bostian, KA (1985) Regulation of repressible acid phosphatase gene transcription in Saccharomyces cerevisiae. Mol. Cell. Biol. 5:2131-41 |
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| Abstract |
We examined the genetic system responsible for transcriptional regulation of repressible acid phosphatase (APase; orthophosphoric-monoester phosphohydrolase [acid optimum, EC 3.1.3.2]) in Saccharomyces cerevisiae at the molecular level by analysis of previously isolated and genetically well-defined regulatory gene mutants known to affect APase expression. These mutants identify numerous positive- (PHO4, PHO2, PHO81) and negative-acting (PHO80, PHO85) regulatory loci dispersed throughout the yeast genome. We showed that the interplay of these positive and negative regulatory genes occurs before or during APase gene transcription and that their functions are all indispensible for normal regulation of mRNA synthesis. Biochemical evidence suggests that the regulatory gene products they encode are expressed constitutively. More detailed investigation of APase synthesis is a conditional PHO80(Ts) mutant indicated that neither PHO4 nor any other protein factor necessary for APase mRNA synthesis is transcriptionally regulated by PHO80. Moreover, in the absence of PHO80, the corepressor, presumed to be a metabolite of Pi, did not inhibit their function in the transcriptional activation of APase. |
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| Keywords |
Acid Phosphatase/biosynthesis; Acid Phosphatase/genetics; Cycloheximide/pharmacology; Enzyme Repression; Genes; Genes, Fungal; Genes, Regulator; Genotype; Kinetics; Molecular Weight; Protein Biosynthesis/drug effects; RNA, Messenger/genetics; RNA, Messenger/isolation & purification; Saccharomyces cerevisiae/enzymology; Saccharomyces cerevisiae/genetics; Transcription, Genetic |
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