title: Cyclic AMP may not be involved in catabolite repression in Saccharomyces cerevisiae: evidence from mutants unable to synthesize it.
abstract: Yeast cells with a nonsense adenylate cyclase mutation, cyr1-3, required cyclic AMP for growth. This phenotype was suppressed by the byc1 mutation; however, cyr1-3 bcy1 cells produced no detectable level of adenylate cyclase or cyclic AMP. On induction, the bcy1 and cyr1-3 bcy1 mutant cells produced the same levels of galactokinase and alpha-D-glucosidase as did the wild-type cells and fourfold-higher levels of invertase. Since galactokinase synthesis was severely repressed by glucose in the constitutive GAL81 mutants, irrespective of the cyr1-3 bcy1 genotype, cyclic AMP may not be involved in catabolite repression.
mesh_terms: D000262:Adenylyl Cyclases / Q000235:genetics*; D000242:Cyclic AMP / Q000378:metabolism*; D004794:Enzyme Repression; D005686:Galactokinase / Q000235:genetics; D009154:Mutation; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D013045:Species Specificity; D000520:alpha-Glucosidases / Q000235:genetics
chemical_list: D000242:Cyclic AMP; D005686:Galactokinase; D000520:alpha-Glucosidases; D000262:Adenylyl Cyclases