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- W1951330234 abstract "In response to an external source of adenine, yeast cells repress the expression of purine biosynthesis pathway genes. To identify necessary components of this signalling mechanism, we have isolated mutants that are constitutively active for expression. These mutants were named bra (for bypass of repression by adenine). BRA7 is allelic to FCY2, the gene encoding the purine cytosine permease and BRA9 is ADE12, the gene encoding adenylosuccinate synthetase. BRA6 and BRA1 are new genes encoding, respectively, hypoxanthine guanine phosphoribosyl transferase and adenylosuccinate lyase. These results indicate that uptake and salvage of adenine are important steps in regulating expression of purine biosynthetic genes. We have also shown that two other salvage enzymes, adenine phosphoribosyl transferase and adenine deaminase, are involved in activating the pathway. Finally, using mutant strains affected in AMP kinase or ribonucleotide reductase activities, we have shown that AMP needs to be phosphorylated to ADP to exert its regulatory role while reduction of ADP into dADP by ribonucleotide reductase is not required for adenine repression. Together these data suggest that ADP or a derivative of ADP is the effector molecule in the signal transduction pathway." @default.
- W1951330234 created "2016-06-24" @default.
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- W1951330234 date "1997-10-01" @default.
- W1951330234 modified "2023-10-16" @default.
- W1951330234 title "The Isolation and Characterization of <i>Saccharomyces cerevisiae</i> Mutants That Constitutively Express Purine Biosynthetic Genes" @default.
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- W1951330234 doi "https://doi.org/10.1093/genetics/147.2.383" @default.
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