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PKA has 2 catalytic subunits (Tpk) which are encoded by 3 genes: tpk1,tpk2 and tpk3. On binding cAMP, PKA is able to phosphorylate some proteins. However, in mutants like ours, it can be assumed that some of that proteins may not be phosphorylated.
PKA serves as a central regulator of the metabolic and transcriptional status of the yeast cell.